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Soundstream Technologies 705s Stereo Amplifier User Manual

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1. ae 12 dB Oct HIGH PASS 12 dB Oct HIGH PASS 60Hz 240Hz 120Hz 500Hz 12 dB Oct LOW PASS 120Hz 500Hz BANDPASS Head Unit CHANNEL 1 amp 2 CHANNEL 3 amp 4 MID 1 4kHz HIGH PASS HIGH PASS 3 WAY 60 240Hz STEREO 3 WAY 50 24092 A 0 LOW PASS 1 4 XOVER INPUT SELECT MIDBASS 120 5000 2 WAY FULL RANGE BRIDGE 2 WAY FULL RANGE 1 amp 2 MONO INPUT REAR SELECT DE 20 BOTH SWITCHES MUST BE IN THE SAME POSITION EMPHASIS SAMPLE SYSTEM 4 2 way in 3 channel mode with fading bass 4 channels of input 2 channels of bridged high pass sub channel in low pass e Q 9 MONO MONO INPUTS E 45 6 R 120500 90 120 90 1020 OOOO Q B G O0o g 2 OOOO OQO 97 28 preg 30 120 vats Ga 60 240 vos 60 240 vois Q 2 MONO SUBWOOFERS 2 CHANNELS 1 2 CHANNELS 3 4 SUBWOOFERS REM 24 dB Oct LOW PASS 30Hz 120Hz SUB CHANNEL HIGH CURRENT _ HIGH POWER Use HIGH CURRENT for loads at or below 1 ohm CAUTION DO NOT SWITCH WHEN AMPLIFIER IS ON SUB CHANNEL BYPASS SUBCH LOW PASS CH 1 4 XOVER INP
2. 18 BOTH SWITCHES MUST BE IN THE SAME POSITION REAR SATELLITE SPEAKERS 12 dB Oct HIGH PASS 60Hz 240Hz 6 dB Oct LOW PASS 7 kHz DE EMPHASIS Head Unit CHANNEL 3 amp 4 HIGH PASS STEREO 3 WAY 60 240Hz BH BRIDGE 2 WAY FULL RANGE MONO REAR FILL DE EMPHASIS SAMPLE SYSTEM 2 3 way with midrange bandpass 2 channels of input 2 channels of tweeter high pass 2 channels of midrange e Q MONO MONO ONE TWO LSE BOOST 2 X OVER LEVEL INPUTS 17 60 EB 5 006 ONE TWO Bo OOPPO R 1K X OVER LEVEL INPUTS alte R AK H 120500 90 amp o OOOHHO WAY 60 Hz X OVER LEVEL INPUTS L R 502 HP 5 02 240 CHANNELS 1 2 CHANNELS 3 4 2 SUBWOOFERS SUBWOOFERS E 24 dB Oct LOW PASS 30Hz 120Hz SUB CHANNEL HIGH CURRENT _ HIGH POWER Use HIGH CURRENT for loads at or below 1 ohm CAUTION DO NOT SWITCH WHEN AMPLIFIER IS ON SUB CHANNEL BYPASS SUBCH B B LOW PASS CH 1 4 XOVER INPUT SELECT M wz TWEETERS NES 12 dB Oct HI
3. O y TOP VIEW PARTIAL 4 5 6 7 VAL 8 9 1011 12 13 14 15 16 17 18 19 20 12 GND REMOTE 0009 AU VN KR POLEN NEN NASA N ERES vo R X OVER LEVEL INPUTS ONE TWO a LEVEL M N INPUTS ROVER LEVEL INPUTS EVE 000000 EGOO Ha OO MONO SUBWOOFERS CHANNELS T 2 _ CHANNELS 3 4 FRONT VIEW 21 22 23 24 25 26 27 28 29 30 31 SUB CHANNEL INTERNAL MONO ON CONFIGURATION SUBCHANNEL NON BRIDGABLE CHANNELS 1 4 COHERENT STEREO l cR BRIDGED MONO USE RIGHT INPUT ONLY BRIDGING CHANNELS 1 4 32 SUB CHANNEL HIGH CURRENT HIGH POWER Use HGH CURRENT for loads at or below 1 chm CAUTION DO NOT SWITCH WHEN AMPLIFIER IS ON VN iem RR Mp HIGH PASS SUB CHANNEL SERO rey awa 602408 sero swar B8 B a Ene i Sume m 4120 5004 INPUT REAR S CHI ee BOTH SWITCHES MUST IN THE SAME POSITION SELECT FILL DE EMPHASIS sger ee 7A emet e T In 3 woy modis channels 1 amp 2 become HIGH PASS CHANNELS P802 channels 3 8 4 become BAND PASS CHANNELS 3 amp 4 INPUTS 1 CHT T DEEMPHASIS b LEVEL i 0
4. REFERENCE 705s 5 3 Channel Power Amplifier OWNERS MANUAL AND INSTALLATION GUIDE SOUNDS EAM T E C H O L G I E S CONGRATULATIONS You now own the REFERENCE705s Amplifier the product of an uncompromising design and engineering philosophy Your Soundstream REFERENCE amplifier will outperform any other amplifier in the world To maximize the performance of your system we recommend that you thoroughly acquaint yourself with its capabilities and features Please retain this manual and your sales and installation receipts for future reference Soundstream amplifiers are the result of American craftsmanship and the highest quality control standards and when properly installed will provide you with many years of listening pleasure Should your amplifier ever need service or replacement due to theft please record the following information which will help protect your investment Serial Dealers Name Date of Purchase Installation Shop Installation Date CAUTION Prolonged listening at high levels may result in hearing loss Even though your new Soundstream Reference705s sounds better than anything you ve ever heard exercise caution to prevent hearing damage TABLE OF CONTENTS acis m 4 5 HEFERENGCE7605S DiaGtant sis ii i eR ER ER 6 7 REFERENCE Power Supply Design 8 Setting High Power High Current ccce uie
5. 60 240 Hz Low Pass 24 dB octave 30 120 Hz 3 way Tweeter High Pass Midrange Low Pass 12 dB octave 1 K 4 KHz Midrange or Midbass High Pass 12 dB octave 60 240 Hz Mid High Pass Midbass Low Pass 12 dB octave 240 960 Hz Subwoofer Low Pass 24 dB octave 30 120 Hz DIMENSIONS 19 0 W x 9 8 D x 2 25 H 23 L O G I E 5 SOUNDSTREAM TECHNOLOGIES 120 Blue Ravine Road Folsom Ca lifornia 95630 USA
6. Fault LED is lit amp power supply fuse is blown or missing Repeatedly blown amp fuse frequent activa check speaker configuration amp may be in tion of Smart Power Supply Circuit High Power mode put amp into High Current mode if subwoofer load is less than 1 ohm see p 8 Setting High Power High Current Switch e speaker or leads may be shorted e verify adequate amplifier ventilation no sound from channels 3 amp 4 with 2 chan e check input settings on bottom of amplifier nels of input switch should be set to inputs 1 amp 2 Channel 1 2 or 4 experience intermittent e circuit breakers on these channels are activat output ing Check for a possible short in the speaker wire or in the speaker itself e Verify the impedance of the load is at or above the rated minimum impedance for these chan nels 22 nn 000000 SERVICE The Reference705s is protected by a limited warranty Please read the enclosed warranty card SPECIFICATIONS POWER OUTPUT SATELLITE CHANNELS SUBWOOFER CHANNEL 4 Stereo 2 Q Stereo 8 Bridged 40 12 Volts Bridged 50 w x4 100 w x 4 100 w x 2 200 w x 2 THD lt 0 1 Signal to Noise gt 100 dB Frequency Response 20 Hz to 20 kHz 0 5 dB Bandwidth 15 Hz to 50 kHz Stereo Separation gt 90 dB Damping gt 200 Input Sensitivity 100 mV 2 5 V Input Impedance 12 ohms CROSSOVER SPECIFICATIONS all continuously variable 2 way High Pass 12 dB octave
7. Secure the ground cable to a solid chassis ground on the vehicle It may be necessary to sand paint down to raw metal for a good connection NOTE There may be a sizable spark when connecting the power and ground lead to the amplifier for the first time Please see the comment on the previous page for information about connecting power and ground wires to your amplifier Please see the comment on page 12 e Double check each and every connection f Re connect the fuse or circuit breaker 5 POWER UP Power up the system and look at the top of the amplifier Depending on the subwoofer 14 INSTALLATION STEP 7 LEVEL SETTING The input levels are adjusted by means of the input level controls located on the front of the amplifier This is a unique dual stage circuit that adjusts both level and gain This topology maintains better Signal to Noise ratios even with low output sources In the ideal situation all components in the audio system reach maximum undistorted output at the same time The reason is because an amplifier will only make what comes into it bigger So if you send it a distorted signal from the head unit it is going to amplify distorted information The same thing holds true if an outboard processor or crossover begins to distort before you have maximum output from the amplifier By setting all components to reach clipping at the same time you can maximize the output of your system For the Reference705s follow
8. ed 2012077 LOW PASS LOWPASS INPUT SELECT m BOTTOM VIEW Key to Callouts Fault LED Indicates a blown fuse High Power LED Indicates amplifier power on in High Power mode High Current LED Indicates amplifier power on in High Current mode Main Fuse Main power supply fuse 12V Connected to a fuse or circuit breaker then to the battery s positive post GND Main ground connection Bolt to a clean chassis ground in the vehicle REM Remote turn on input from the head unit Accepts 12V Speaker Output Connections Mono subwoofer channel LSE Q Frequency and Q adjustments 0 Low Pass Crossover Adjustment Pot Subwoofer channel crossover frequency setting for the internal low pass filter 11 Input Level Subwoofer channel level control 12 Inputs Right and left channel RCA inputs for the subwoofer channel 13 Speaker Output Connections Channels 1 amp 2 14 Crossover Adjustment Pots Channels 1 amp 2 crossover frequency setting for the internal high pass filter in 2 way mode and channels 1 amp 2 and 3 amp 4 crossover frequency setting for the internal band pass filter in 3 way mode 15 Input Level Channels 1 amp 2 level control 16 Inputs Right and left channel RCA inputs for channels 1 amp 2 17 Speaker Output Connections Channel 3 amp 4 18 High Pass Crossover Adjustment Pot Channels 3 amp 4 crossover frequency setting for the internal
9. current Unlike other amplifiers Soundstream s REFERENCE amplifiers can be configured to drive virtually any impedance and make maximum power To determine the setting for your application follow the chart below 40 20 1Q 1 2Q 12 Volts 14 4 Volts 14 4 Volts 14 4 Volts High Power n a Watts High Current 100 200 300 400 Watts OTHER COMMENTS If you blow fuses with your Reference705s switch to the High Current mode If the problem persists it is likely that the amplifier is seeing a dead short either in the speaker wire or in the speaker itself Rectify INSTALLATION STEP 2 SELECTING THE CROSSOVER MODES The Reference705s incorporates a sophisticated fully adjustable electronic crossover for each of its two pairs of channels and subwoofer channel The Reference705s can drive a full system without need of an outboard electronic crossover Before installing the amplifier make certain the switches on the bottom are set to the correct positions After setting the switches be sure to install the hole plugs included with the amplifier SUB CHANNEL CHANNEL 1 amp 2 CHANNEL 3 amp 4 HIGH PASS HIGH PASS MID BYPASS SUB CH STEREO 1 4kHz 3 WAY 60 240Hz STEREO 3 WAY 60 240Hz LOW PASS CH 1 4 XOVER INPUT SELECT B B F D BRIDGE MIDBASS 2 WAY FULL RANGE BRIDGE 2 WAY FULL RANGE 1 amp 2 ON MONO 120 500Hz MONO INPUT REAR BOTH SWITCHES MUST BE IN THE S
10. high pass filter in 2 way mode 19 Input Level Channels 3 amp 4 level control 20 Inputs Right and left channel RCA inputs for channels 3 amp 4 21 Subwoofer Channel Crossover Switch Select LOW PASS for use with the internal crossover or BYPASS for use with an external crossover 22 Subwoofer Channel Input Select Selectable inputs from internal from channels 1 4 or external from Subwoofer local RCA inputs 23 Coherent Stereo Bridge Mono Switch Channels 1 amp 2 Select Bridge for bridged mono operation use right channel input Select Stereo for coherent stereo operation 24 Channels 1 amp 2 and 3 amp 4 Bandpass Range Crossover Switch 3 way operation only Select MID for use with midrange drivers and tweeters or MIDBASS for use with midbass drivers and satellites 25 2 way 3 way Crossover Switch Channels 1 amp 2 Select 2 way for high pass low pass operation or 3 way for highpass bandpass lowpass operation 26 Channels 1 amp 2 Crossover Switch Select HIGH PASS for use with the internal crossover or FULL RANGE for use with an external crossover 27 Coherent Stereo Bridge Mono Switch Channels 3 amp 4 Select Bridge for bridged mono operation use right channel input Select Stereo for coherent stereo operation 28 2 way 3 way Crossover Switch Channels 3 amp 4 Select 2 way for high pass low pass operation or 3 way for highpass bandpass lowpass operat
11. the below procedure for the quickest easiest means of setting the levels 1 Turn the amplifier s input levels to minimum position fully counter clockwise 2 Set source unit volume to approximately 3 4 of full volume While playing dynamic source material slowly increase the amplifiers input level until a near maximum undistorted level is heard in the system NOTE Your best combination of output and Signal to Noise ratio will be achieved when the input levels are set between 500 mV and 5 0 V 15 INSTALLATION STEP 8 CROSSOVER ADJUSTMENTS In most car audio installations there is a tendency for a midbass boom Because of their interior dimensions most cars will resonate or ring at these midbass frequencies If we design the system so there is less musical information in this region the final response is very smooth and natural sounding The Reference705s incorporates a continuously variable staggered asymmetrical electronic crossover The high and low pass portions of the crossover can be adjusted independently of one another Follow the procedure below to adjust the crossover 24 dB Oct Low Pass Staggered Asymmetrical Crossover 24 dB octave low pass 12 dB octave high pass 12 dB octave band pass 12 dB Oct High Pass 12 dB Oct Band Pass 1 With the crossover activated set the frequency adjustments to the 12 o clock position 2 While listening to music adjust the high pas
12. to drive your Reference705s Use a high quality cable that will be easy to install and has minimal signal loss to guarantee optimum performance SPEAKER CABLE The Reference705s will accept up to 8 gauge speaker cable Use a high quality flexible multi strand cable for best performance and longevity Soundstream Speaker120 12 gauge WIRING DIAGRAM Handcrafted in the U S A MO LSE Q X OVER LEVEL MONO INPUTS X OVER LEVEL INPUTS LEVEL INPUTS GND REMOTE ONE TWO LE s m ONE TWO at Bit 592 E R use 502 L R DO 9 999 Z Re QOC MONO SUBWOOFERS HANNELS 2 CHANNELS 3 4 1 To Remote oleae tree Head Unit To Chassis Ground Fuse atthe Battery TN EU UN E SUBWOOFERS SATELLITE SPEAKERS SATELLITE SPEAKERS 5 h To 12V Battery Terminal 13 INSTALLATION STEP 6 INSTALLATION AND MOUNTING 1 AMPLIFIER LOCATION The Reference705s employs highly efficient circuitry and Soundstream s unique Chassisin design to maintain lower operating temperatures Additional cooling may be required if the amplifie
13. uis ee uer uin sime reine 9 Selecting Crossover 4 10 Selecting Input Modes 11 Setting Coherent Stereo Bridged 12 With 12 13 Installation and EAE 14 level Sobllfig 15 Crossover AOIUSImIBIS Teo tenete terae olt e DTE 16 eminet teas bea edite 16 ESE Q Subwoofer Equalization Circuitry idet he kr eoo teh 17 18 21 Protection Circuitry amp Troubleshooting s e rl ERR ER ER ERE ME 22 vip D 23 23 DESIGN FEATURES Uncompromising Design and Construction including mil spec glass epoxy circuit boards and high current custom gold plated solid brass connections that will accept up to 4 gauge power ground wire High Power High Current Capability subwoofer channel only Soundstream s exclusive circuitry permits customization of your amplifier to its particular application High Current for ultra low impedance loads multiple subwoofers less than 1 ohm or High Power for higher impedance loads 1 ohm and up Chassisink Darlington Power Array Soundstream s overbuilding of the output section incorporates multiple output transistors instead of a few for faster stronger power delivery The transistors are directly sandw
14. AME POSITION SELECT DE EMPHASIS LOW PASS The subwoofer channel is designed to operate in low pass or full range The low pass is a continuously variable 24 dB octave electronic crossover with a range of 30 120 Hz 2 WAY HIGH PASS The high pass crossover is used for sending only midrange and high frequency information to particular speakers Activate the high pass crossover to drive satellite or coaxial speakers in the system along with subwoofers You can later adjust the exact frequency from the front of the amplifier The high pass frequency can be adjusted separately for either pair of channels of the amplifier REAR FILL DE EMPHASIS The Reference705s features an innovative rear fill de emphasis circuit which places more emphasis on the front stage when used in the five channel mode The circuit removes frequencies above 7 000 Hz at the rate of 6 dB octave By removing upper frequency information from the rear fill a more natural sounding rear fill effect is created 3 WAY MIDBASS MIDRANGE BAND PASS The Reference705s can be operated in midrange or midbass band pass configuration In the 3 way mode you can tri amplify with active midbass or midrange to maximize control over individual drivers The bandpass includes a low pass and a high pass filter which work independently of one another to drive the midrange or midbass speakers In 3 way crossover mode channels 1 amp 2 become HIGH PASS and channels 3
15. E Q is a proprietary subwoofer control circuit included with the Reference705s amplifier It is capable of both removing subsonic energy in program material and LSE Q providing a variable boost at low frequencies The circuit consists of two controls 07 28 1760 One adjusts the frequency of operation and the other adjusts the range of boost With both controls adjusted fully counter clockwise no boost is applied and the amplifier is flat in response down to 20 Hz Q Hz BOOST FREQ The frequency control Hz adjusts the starting point of the subsonic filter This high FIG 1 LSE Q pass filter can be adjusted from 20 Hz up to a maximum of 60 Hz This control is useful for setting the lowest frequency that your subwoofer will see See figure 1 The control adjusts the amount of boost applied at the set frequency This is adjustable from 707 flat to 2 8 9 dB See figure 2 5 0 When the is set to 707 Butterworth LSE Q acts as sub sonic filter st only See figure 3 dor 15 The simple act of removing the signal below the vented tuning frequency 2f can improve system output by as much as 3 dB With Q values greater 25 than 707 boost is added in addition to the sub sonic filter see figure 4 Frequency ma 50 100 200 FIG 2 Variable Application Woofers in vented enclosures have good power handling characterist
16. GH PASS 1kHz 4kHz CHANNEL 1 82 MID 1 4kHz 3 WAY MIDRANGE SPEAKERS 12 dB Oct HIGH PASS 60Hz 240Hz 12 dB Oct LOW PASS 1kHz 4kHz BANDPASS Head Unit CHANNEL 3 amp 4 HIGH PASS HIGH PASS 60 240Hz STEREO 3 WAY 60 240 2 MIDBASS 2 WAY FULL RANGE BRIDGE 1 120 5004 19 AG 2 WAY FULL RANGE MONO BOTH SWITCHES MUST BE IN THE SAME POSITION SAMPLE SYSTEM 3 3 way with midbass bandpass and subwoofer to midbass satellite fading 4 channels of input 2 channels of midbass bandpass 2 channels of high pass sub channel in low pass High Current lt 1 Ohm NET LSE Q a LEVEL MONO INPUTS LEVEL INPUTS X OVER LEVEL INPUTS BOOST 17 60 5 0 06 ONE TWO e e 5 02 L R d 502 L 9999 4 2 QOQ xe OO OHH 2 MONO SUBWOOFE ERS x CHANNELS 2 CHANNELS 3 4 e SUBWOOFERS FRONT SATELLITE SPEAKERS MIDBASS SPEAKERS Do 24 dB Oct LOW PASS 30Hz 120 2 SUB CHANNEL HIGH CURRENT T HIGH POWER Use HIGH CURRENT for loads ar or below 1 ohm CAUTION DO NOT SWITCH WHEN AMPLIFIER IS ON SUB CHANNEL BYPASS H SUB CH 0
17. UT SELECT LEFT SATELLITE SPEAKER Ra 12 dB Oct HIGH PASS 60Hz 240Hz CHANNEL 1 82 MID 1 4kHz 3 WAY 120 500Hz 21 RIGHT SATELLITE SPEAKER Dr 12 dB Oct HIGH PASS 60Hz 240Hz Head Unit CHANNEL 3 amp 4 HIGH PASS HIGH PASS 60 24092 STEREO 3 WAY 60 2402 MIDBASS 2 WAY FULL RANGE BRIDGE 1 BG 2 WAY FULL RANGE MONO BOTH SWITCHES MUST BE IN THE SAME POSITION o PROTECTION CIRCUITRY Your Reference705s is protected against both overheating and short circuits by means of the following circuits e Main power supply fuses Maxi fuse at 40 amps e Smart Power Supply Thermal Rollback activating at 85 C A fail safe thermal protection circuit activating at 95 C Self resetting circuit breakers on channels 1 2 3 amp 4 to protect against short circuits Your amplifier also incorporates an innovative Fault Diagnosis system that identifies a blown power supply fuse NOTE If you experience blown main power supply fuse DO NOT increase value beyond the 40 amp maxi fuse Doing so will void your warranty and may damage your amplifier TROUBLESHOOTING PROBLEM CAUSE No sound and LED s are not lit no power or ground at amp e no remote turn on signal e blown fuse near battery
18. amp 4 become BANDPASS NOTE 3 way mode channels 3 amp 4 inputs are not used INSTALLATION STEP 3 SELECTING INPUT MODES The Reference705s can be driven with either one two or three pairs of stereo inputs If your source unit has front and rear outputs you can take advantage of its fading capability by driving the Reference705s in 5 channel mode with two pairs of inputs When operated in the 5 channel mode with 2 pairs of inputs the lowpass subwoofer channel will operate in a non fading mode it derives its signal from the front and rear inputs After setting the input mode switches be sure to install the hole plugs included with the amplifier 5 CHANNEL OPERATION WITH 4 CHANNELS OF INPUT Front input to Channels 1 amp 2 and set stereo switch to either Coherent Stereo or Mixed Mono e Rear input to Channels 3 amp 4 and set input switch to 3 amp 4 stereo switch to either Coherent Stereo or Mixed Mono e Subwoofer input switch set to CH 1 4 5 CHANNEL OPERATION WITH 2 CHANNELS OF INPUT e Input to Channels 1 amp 2 set stereo switch to either Coherent Stereo or Mixed Mono e Channels 3 amp 4 set input switch to Internal From Ch 1 amp 2 stereo switch to either Coherent Stereo or Mixed Mono e Subwoofer input switch set to CH 1 4 3 CHANNEL OPERATION WITH 2 CHANNELS OF INPUT e Input to Channels 1 amp 2 set stereo switch to Mono e Input to Channels amp 4 s
19. et input switch to 3 amp 4 stereo switch to Mono e Subwoofer input switch set to CH 1 4 11 000000 INSTALLATION STEP 4 COHERENT STEREO BRIDGED MONO The stereo channels of the Reference705s have the ability to operate in either of the following modes Coherent Stereo with identical left and right stereo channels for maximum fidelity Bridged Mono for dedicated single channel operation ideal for using the Reference705s in 3 channel operation It is also used when large amounts of power are necessary for single speakers In bridged mono only the right channel input per pair of channels is active COHERENT STEREO PRSS MONO In bridged mono only the right channel 0900 UD For system examples and diagrams see pages INSTALLATION STEP 5 WIRING POWER AND GROUND To assure maximum output from the Reference705s use high quality low loss power and ground cables The Reference705s will accept up to 4 gauge power and ground cables which is the only size recommended Read this or sparks will fly The Soundstream REFERENCE amplifiers have extensive internal power supply capacitance called the Ultra Low ESR Capacitance Bank Multiple small input power capacitors act as an internal stiffening capacitor Because of the large amount of internal capacitance there may be a sizable spark when connecting the power and ground lead to the amplifier for the first
20. iched between the circuit board and the heatsink in a design called Chassisink to ensure cool efficient amplifier operation e Staggered Asymmetrical Electronic Crossover Continuously variable 2 or 3 way crossovers with 12 dB octave high pass and 24 dB octave subwoofer low pass In 3 way mode bandpass can be selected for midrange or midbass Rear Channel De emphasis A circuit based on theater surround technology in which rear fill information is rolled off at 6 dB octave with a 3 dB point at 7 000 Hz to provide a more realistic listening experience in 5 channel mode only Power Supply Design All power supply components are located near one another for the shortest possible current path and are connected by thick wide PCB traces which ensures rapid high current delivery The entire power supply is isolated on one side of the circuit board while the audio stage is located opposite it guaranteeing minimal noise e Ultra Low ESR Capacitance Bank 24 miniature stiffening capacitors ensure rapid power delivery for dynamic peaks Multiple small input power capacitors are used to provide a lower ESR Equivalent Series Resistance which means more power faster e Smart Thermal Rollback Most amplifiers shut off when they get too hot In the unlikely event the Reference705s reaches 85 C it will gradually roll back its average power without affecting the dynamics Once the amplifier has cooled off it
21. ics above the tuning frequency but below the tuning frequency power handling drops off considerably This is due to the loss of any appreciable resistive air mass At frequencies below resonance the woofer starts to behave as if it were mounted in free air If we wish to 5 improve the performance of ic reus F3 50 100 200 vented system we should remove FIG 3 Variable High Pass these unwanted signals from our 20 system These be removed by adding the subsonic filter Figure 5 19 shows the effectiveness of LSE Q on woofer excursion Woofer travel is SA Frequency 0 0 7 5 mm at 10 Hz with LSE Q properly adjusted this excursion can be FIG 5 Limited Excursion reduced to less than 1 mm This is of great benefit to lowering woofer distortion and increasing output 5 OF Adjustment M An easy method of optimizing your existing subwoofer enclosure with 10 LSE Q s Hz control is as follows y 1 Adjust frequency and boost control to full CCW position 25 3015 Frequency Hz 50 100 200 2 While listening to music with strong bass content at a moderate level FIG 4 Variable slowly adjust frequency control clockwise Listen for a reduction of bass response Now rotate frequency control sligh
22. ion 29 Channels 3 amp 4 Crossover Switch Select HIGH PASS for use with the internal crossover or FULL RANGE for use with an external crossover in 2 way mode 30 Channels 3 amp 4 Input Select Selectable inputs from internal from channels 1 amp 2 or external from channel 3 amp 4 local RCA inputs in 2 way mode 31 Rear Fill De emphasis Switch Channels 3 amp 4 Select ON to engage the 6 dB octave low pass filter at 7 kHz for use in 5 channel 2 way mode 32 High Power High Current Switch Subwoofer channel only 2 0909 0 amp oNmN o REFERENCE POWER SUPPLY DESIGN The Reference705s employs an extremely efficient unregulated pulse width modulated power supply Like the rest of the REFERENCE amplifiers from Soundstream the Reference705s is rated at 12 volts but is designed to take advantage of the additional voltage available when the vehicle is running The two major advantages of the unregulated power supply are e awesome dynamic power capabilities e added continuous power with higher voltages see chart below Because of the dynamic properties of most music all audio components should be able to react accordingly Thanks to its unregulated power supply the Reference705s can 4 Ohm Sub Channel Watts 4 ohm Power 200 watts x 1 12 volts Read this or sparks will fly The Soundstream REFERENCE705s amplifier has extensive internal power supply capacita
23. nce called the Ultra Low ESR Capacitance Bank Multiple small input power capacitors act as an internal stiffening capacitor Because of the large amount of internal capacitance there may be a sizable spark when connecting the power and ground lead to the amplifier for the first time In order to charge the capacitor bank without a spark we suggest you do the following 1 Connect the 12 volt cable to the amplifier and to the battery 2 Connect one end of the ground cable to the chassis of the vehicle 3 We have supplied a 150 ohm 2 watt resistor with the amplifier One leg of the resistor has been connected to the ground terminal of the amplifier 4 To charge the capacitor bank touch the loose end of the ground cable to the open leg of the resistor for at least 45 seconds 5 Remove the resistor and connect the ground wire INSTALLATION STEP 1 SETTING THE HIGH POWER HIGH CURRENT SWITCH applies to subwoofer channel only The Reference705s subwoofer channel can be switched between High Power and High Current modes This allows the Reference705s to maximize power and efficiency at impedances gt 1 Ohm in High Power mode or down to 1 2 Ohm in High Current mode The circuit operates by selecting a set of power supply voltage rails best suited to your particular application One is a higher voltage tap optimized for high impedance applications while the other is lower voltage designed to provide more
24. r is located in an area with poor air flow or when driving especially low impedance loads at extremely high levels When mounting the amplifier it should be securely mounted to either a panel in the vehicle or an amp board or rack that is securely mounted to the vehicle The mounting location should be either in the passenger compartment or in the trunk of the vehicle away from moisture stray or moving objects and major electrical components To provide adequate ventilation mount the amplifier so that there are at least two inches of freely circulating air above and to the sides of it 2 MODE SWITCHES Set High Power High Current Input Switches and Crossover switches to the appropriate positions see pages 11 and 18 21 These switches determine the design of the system 3 MOUNTING THE AMPLIFIER a Using the amplifier as a template mark the mounting surface b Remove the amplifier and drill the holes c Mount the amplifier to the surface using the provided hardware Your Reference705s is provided with 8 sheet metal screws which use a 1 8 drill hole 4 WIRING Run and connect the audio signal and remote turn on cables to the amplifier the source unit b Carefully run the positive cable from the amplifier to a fuse or circuit breaker within 18 of the battery c Then connect the fuse or circuit breaker to the battery Leave the circuit breaker off or the fuse out until everything is bolted down d
25. returns to full power output If overheating should continue a second thermal sensing protection circuit will shut off the amplifier if the heatsink reaches 95 C e Unregulated Power Supply 4 ohm power ratings are measured at 12 volts which means substantially greater output in the real world when the vehicle is running where voltages range from 13 6 to 14 4 volts Dynamic capability of the unregulated power supply is vastly greater than that of a tightly regulated power supply Fault Monitor LED on the front panel notifies you of a blown power supply fuse 1 2 Ohm Subwoofer Drive Ability The Reference705s subwoofer channel is designed to be stable into any impedance down to 1 2 ohm e Six Dual Discrete Class A Drive Stages Over six times the drive current of most amps which guarantees maximum performance into any load e Drive Delay Muted Turn on off Circuit A unique circuit which completely eliminates amplifier related turn on off noises Flexible Input Sensitivity accepts voltages from 200 mV 80 mV on the subwoofer channel to 5 0 V which permits maximum output from the amplifier with virtually any source unit e Balanced Input Design for added immunity to noise caused by component and vehicle electrical system interaction AIRBASS Upgradable This feature allows RF wireless remote control level adjustment of Reference 05s OOOO
26. s frequency control Select a frequency high enough to prevent damage to the speakers yet low enough that you are able to retain midbass in the front speakers 3 Adjust the low pass frequency control in the same way as the high pass This time listen to the bass You should find a setting that will give you a solid sound with minimum boom from resonating frequencies NOTE You may find it necessary to readjust the crossover after listening to the system The correct settings are a combination of the capabilities of the equipment and your listening preferences AIRBASS ACCESSORY OPTION Soundstream s new A RBASS feature can be added to the REFERENCE705s amplifier This feature allows wireless RF remote control level adjustment of the REFERENCE705s subwoofer NOTE The AIRBASS accessory operates the subwoofer channel only AIRBASS goes not control the level of channels 1 2 3 amp 4 Installing A RHBASS M involves removing the bottom plate of the amplifier adding the A RBASS TM circuit board and flipping a switch The switch is labeled on the amplifier s main circuit board DO NOT set the A HBASS switch to the IN position unless the module has been added DO NOT move the AIRBASS switch while the amplifier is ON Doing so may damage your speakers Please refer to the AJFRBASS owner s installation manual for more details 16 INSTALLATION STEP 9 LSE Q THEORY AND USE LS
27. time In order to charge the capacitor bank without a spark we suggest you do the following 1 Connect the 12 volt cable to the amplifier and to the battery 2 Connect one end of the ground cable to the chassis of the vehicle 3 We have supplied a 150 ohm 2 watt resistor with the amplifier One leg of the resistor has been connected to the ground terminal of the amplifier 4 To charge the capacitor bank touch the loose end of the ground cable to the open leg of the resistor for at least 45 seconds Remove the resistor and connect the ground wire ii oo0000 WIRING continued CIRCUIT BREAKERS FUSES EXTERNAL Like all car audio amplifiers the Reference705s must be protected with a fuse or circuit breaker located within 18 of the battery This will prevent a fire in the event of a shorted cable The value of the circuit breaker or fuse should be between 60 and 80 amps INTERNAL The Reference705s is fused on its front panel with a 40 amp Maxi fuse In the event of a blown power supply fuse the Fault indicator on the front panel will light Never replace the fuse with a higher value than what is supplied This may result in amplifier damage and will void the warranty REMOTE TURN ON Connect the turn on lead from the source unit to the Remote input on the amplifier When 12 volts is received the amplifier will turn on SIGNAL CABLE Depending on your application you may use one to three pairs of signal cables
28. tly backwards This serves the purpose of removing the subsonic bass energy Soundstream s LSE Q contains the same type of circuit with the added benefit of infinite adjustability Our Q and Hz control can provide virtually any combination of boost and cut to suit your designs So LSE Q can 17 SAMPLE SYSTEM 1 2 way front to rear fade with constant bass 4 channels of input 4 channels of 2 way high pass sub channel in low pass MONO MONO te sam ONE TWO 1 RS ee O PEU d bos URIS eta eR A R 45 m 120500 120 90 120 OOOO OOL 2 OO 97 28 20 120 vats way 99 240 60 249 yos MONO SUBWOOFERS H CHANNELS 1 2 CHANNELS 3 4 SUBWOOFERS 24 dB Oct LOW PASS 30Hz 120Hz SUB CHANNEL HIGH CURRENT POWER Use HIGH CURRENT for loads at or below 1 ohm CAUTION DO NOT SWITCH WHEN AMPLIFIER IS ON FRONT SATELLITE SPEAKERS Fan 12 dB Oct HIGH PASS 60Hz 240Hz SUB CHANNEL CHANNEL 1 amp 2 HIGH PASS 60 240 2 MID BYPASS SUBCH 1 4kHz 3 WAY LOW PASS CH 1 4 INPUT SELECT 2 WAY FULL RANGE i MIDBASS 120 500H2

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