Pyramid Technologies CR-74G User's Manual
Contents
1. 800 200 00HZ 18 MIDWOOF ERS 40 20000 2 20 BOHZ 1 E ELECTRICAL WIRING DIRECTIONS CAR RADIO amp EO uS FRONT OUTPUT REAR OUTPUT ELECTRONIC CROSSOVER NETWORK IGNITION o ELECTRONIC CROSSOVER NETWORK 8 8 A AUTO ON B B 12V G GROUND 69 gt Q S AMP Q S gt gt gt Q gt FRONT TWEETERS FRONT MIDRANGE FRONT WOOFERS REAR TWEETERS REAR MIDRANGE REAR SUBWOOFERS ADJUSTMENTS NOTE 1 Please use cassette tape or compact disc that has good dynamic range for setting output level and crossover frequencies 92 Please locate FM signal at the strongest station for radio reception 3 Do not mount the CR 746 until the following 6 steps have been com pleted 4 Donotoverdrive the audio system STEP 1 1 Adjust the input gain control of each amplifier to half of maximum 2 Adjust each of the output gain con trols and crossover selector point of the CR 74G at the following positions Front gain at 10 o clock Rear gain at 10 o clock Subwoofer gain at 19 o clock Front Hi pass at 160Hz Rear Hi pass at 160Hz Subwoofer low pass at 160Hz 3 Activate the radio power on and turn up the volume slowly if any of the following symptoms are found please turn off the system and refer2. 180 degrees out of phase to help compensate time loss between the mid high end fre quency drivers and the subwoofer The stereo mono switch changes the sub woofer output to either stereo or mono for single subwoofer use gg 8 25 9 0 x mm 7 0 1 7 5 EL 9 rx HE EE 746 48 9 09 FUNCTIONS 1 FREQUENCY EXTENDER 4 DUAL INPUT SWITCH This switch changes crossover points from 39 400Hz to 640 8 000 Hz for high frequency front channel drivers FRONT CHANNEL HIGH PASS CROSSOVER SELECTOR By turning the selector you can choose from an infinite number of crossover points from 32 400Hz in the standard mode and from 640 8 000Hz when the frequency exten der is in the on position FRONT CHANNEL INPUT PORT Input front signal from sound source into here via RCA cable If your sound source has only one pair of preamp RCA cables you must plug them into this input channel and push to the on position the dual input Switch Putting this switch to the on position allows you to hookup a sound source with just one set of pre amp RCA cables It automatically transfers the signal to both the front and rear channels Do not under any circum stances input into the rear channel when the dual input switch is in the on position REAR CHANNEL INPUT PORT Rear faded input signal from sound source into here via RCA cable When using both t
3. ECIFICATION __ _ 1A DO NOT OVERLOAD g TAPPING SCREW 4 12 4 5 WASHER 4 4 22 PLAIN WASHER 4 4 2 www pyramidcaraudio com
4. PYRANWO Gold MODEL CR 74G ELECTRONIC CROSSOVER NETWORK FEATURES The CR 74G was created to help the car stereo audiophile to install a bi amp tri amp or multi amp system with extreme ease while still allowing for the most sophisticated settings availacle in a high end installation The CR 746 has two front and one rear pre amp inputs via RCA jacks with correspon ding front and rear RCA output jacks It also features a constant subwoofer out put which operates independently of any fader control What makes the CR 74G special is that it features two high pass crossover points that are infinitely adjustable from 39Hz to 400Hz and a low pass crossover for sub woofer The frequency extender switch extends the crossover frequency of the front output for high frequency speakers thus changingthe crossover points tobe adjustable from 640 8 000Hz instead of 39 400Hz The frequency extender affects the front outputs only The dual in put switch allows radios and equalizers with only one pair of RCA pre amp jacks to operate both front and rear outputs at the same time Thus by placing the fre quency extender switch and the dual in put switch to the on position converts the CR 74G into a three way crossover system The CR 746 also features a 1948 boost at 45 80 or 120Hz to help create a smoother bass response when the subwoofer is baffled in a cabinet The phase shifter switch shifts the subwoofer output
5. T ELECTRONIC SUBWOOFER FRONT OUTPUT SUBWOOFER SP C 4 CHANNEL STEREO FRONT REAR THREE AMPLIFIER SYSTEM CAR RADIO amp EQ REAR OUT TFRONT OUT Fi 7 a INPUT SW P FRONT INPUT ELECTRONIC 598 QUTPUT CROSSOVER NETWORK P4 INPUT SW FRONT INPUT ELECTRONIC CROSSOVER NETWORK A PSN OUT 4 9 IN EN I N FRONT TWEETERS gl lt v FRONT OUTPUT REAR OUTPUT FRONT MIDRANGE 1 AMP FRONT WOOFERS FA REAR TWEETERS FRONT OUTPUT REAR OUTPUT REAR MIDRANGE SUB OUTPUT di JREAR SUBWOOFERS 2 CHANNEL MULTIPLE AMPLIFIER INSTALLATION NOTE Each set of three amplifiers be ease installation 4 channel amps can also converted to single PB 900G s in order to be substituted for two channel amps CAR RADIORED CAR RADIORED ES front in daul out CR 74G AMP AMP front in daul out CR 74G front in AMP daul out CR 74G AMP AMP front in AMP CR 74G AMP 1 SUPER TWEETERS ig 8000 200000HZ K MIDRANGE 400 20000HZ MIDWOOFERS 20 400HZ rweerers T 5000 20000HZ D LOWER MIDRANGE 8 200 20000 2 g WOOFERS 20 250 2 15 if UPPER MIDRANGE 2000 20000H2 id MIDWOOFERS 20000H2 i WOOFERS 20 125HZ 1 UPPER MIDRANGE if
6. he front channel input port and the rear channel in put port simultaneously the Dual In put Switch should be in off position REAR CHANNEL HIGH PASS CROSSOVER SELECTOR By turning the selector you can choose from an infinite number of crossover points from 39 400Hz 10 11 19 13 14 DUAL IN OUT PORT You can use this connection if you have a third pre amp audio source for the subwoofer or connect two or more CR 746 modules to create a system with unlimited number of amplifiers SUBWOOFER LOW PASS CROSSOVER SELECTOR By turning the selector you can choose from an infinite number of crossover points from 39 400HZ STEREO MONO SELECTOR By pushing this switch to the on posi tion the subwoofer output changes from stereo to mono thus facilitating single subwoofer installations PHASE SHIFTER SELECTER Allows you to change the phase of your subwoofers from 0 degrees to 180 degrees to help compensate for timing differences between drivers LED POWER INDICATOR This indicator lights up when the unit is properly powered ground and the remote power is turned on to it FRONT CHANNEL OUTPUT PORT Connect the RCA cable to the front channel amplifier input FRONT GAIN CONTROL By turning this control clockwise you increase the front channel level REAR CHANNEL OUTPUT PORT Connect the RCA cable to the rear channel amplifier input 15 16 17 18 19 REAR GAIN CONTROL By tur
7. hs Set the phase switch selector from one position to the other and listen to the sound per formance leave the switch in the position where you have the most bass output from the subwoofer STEP 5 SUBWOOFER STEREO MONO MODE 1 Set the mode switch to the mono position for a single suowoofer system 2 Set the mode switch to either the mono or stereo position for more than two subwoofer systems 3 Please note the stereo mode wil give you better stereo separation the mono mode will result in higher bass output level but without stereo separation TROUBLE SHOOTING SYMPTOM 1 Not working 9 LED power on indicator not going on 3 A whining sound can be heard through the speakers at low volume level with running engine 4 A motor boating type of sound when system is at reasonably Hi level 5 Sound distortion at low volume level A whining noise that increases and decrease as the volume is varying at a normal listening level and running engine REMEDY Check the battery cables for a good connection Check all fuses Check all power wire connections if the system is receiving 4 19V Same as symptom 1 remedy Check the red power wire with good connection directly to the battery and ground point must make good contact with chassis ground The radio and the CR 74G must be grounded at the same point to avoid ground loops Same as symptom 2 remedy Or Output levels not set correctly Outp
8. ning this control clockwise you increase rear channel level SUBWOOFER GAIN CONTROL By turning this control clockwise you increase subwoofer channel level SUBWOOFER CHANNEL OUTPUT PORT Connect the RCA cable to the sub woofer channel amplifier input WOOFER ENCLOSURE EQUALIZATION 12dB Boost at 45 80 190Hz By pushing this switch you activate a single octave 19dB boost at either 45 80 or 190Hz depending on the position of the Frequency Selecton Switch and maintain smooth bass response POWER CONNECTION PORT B B REMOTE B WIRING Connect a red wire of at least 91 gauge to the B terminal screw and wire to the car battery or other power source WIRING Connect a black wire of at least 19 gauge to the B terminal screw wire to car chassis for round con nection REMOTE WIRING Connect an orange wire to remote activating 12VDC wire of car stereo ELECTRONIC CONNECTIONS 2 CHANNEL STEREO THREE AMPLIFIER SYSTEM OUT 1 i TWEETER IN J SP Pd 1 DAUL INPUT SW FRONT INPUT MIDRANGE REAR OUTPUT AMP MIDRANGE SP CAR RADIO amp EQ SUB OUTPUT LECTRONIC _ ere SUBWOOFER SP B 4 CHANNEL STEREO FRONT REAR BI AMPLIFIED SYSTEM f FRONT Uu AMP FRONT SP d DAUL INPUT SW Duc t FRONT INPUT REAR REAR OUTPUT AMP REAR SP CAR RADD amp EQ SUB OUTPU
9. t the crossover frequency even lower It is advisable to check the frequency response of your woofer so you set the crossover to match though it is more important to have good sound than frequency match If the bass is tight and deep sounding but the volume level is low increase the sub woofer gain control to match the mid range volume 4 Frontchannel crossover frequency A Adjust the fader of radio tape CD to increase volume level of the front outputs B Adjust the front channel crossover frequency downward or upward slowly from the pre setting of 160Hz and listen to the preferred performance 5 Rearchannel crossover frequency A Adjust the fader of radio tape CD to increase volume level of the rear outputs B Adjust the rear channel crossover frequency downward or upward slowly from pre setting of 160Hz amp listen to preferred performance 6 Proceed with the road test to check for sound quality and re adjust the subwoofer output level relative to the mid range again according to noise inside the moving car if necessry 7 Mark down the best sounding output level and crossover frequency setting for easy relocating if the setting acci dentally changes STEP 4 SUBWOOFER PHASE The relative distance of the subwoofer and the mid range tweeter inside a car may cause a time delay between the two systems The car audio system will then sound out of phase no bass or the bass seems to lag behind the hig
10. to the trouble shooting chart for remedy A Obvious distortion B Not working C No bass response STEP 2 OUTPUT LEVEL 1 Set the tone balance and fader control of radio at center position 9 Set the volume control at approxi mately 9 oclock position 3 Adjust the front rear and subwoofer channel output level with cassette tape or compact disc by turning each of the gain controls of CR 74G until the signal begins to distort If radio output levels differ considerably from cas sette tape CD output levels locate a position suitable for both sources 4 Turn the radio volume control to desired listening level for each pro gram source amp mark down the figure for easily relocating if the setting accidentally changes 5 Ifthe front rear volume levels are not balanced after setting the levels turn the fader to the center position and adjust the front amplifier gain control to match with rear amplifier system STEP 3 CROSSOVER FREQUENCY In addition to the crossover frequencies printed on the CR 746 the others are shown as follows 120HZ 300HZ 400HZ FREQUENCY X1 1200HZ 800HZ e 2400HZ 720HZ m 6000HZ 640HZ2 9 9 8000HZ FREQUENCY X20 TO SET SUBWOOFER CROSSOVER FOLLOW THESE INSTRUCTIONS 1 Same as Step 9 1 9 Same as Step 2 9 3 Adjust the subwoofer crossover fre quency downward from the preset ting of 160Hz to 100Hz or below If the bass is boomy or soft adjus
11. ut levels not set correctly Install a 10A in line filter on CR 74G red power wire Check the alternator diodes or the voltage regulator NOTE It is very important to use high quality shielded RCA patch cords for all audio installations Use of cheap unshielded RCA patch cords canbe the source of many types of interference and noise Never run power wires and audio signal wires through the same route Power and ground wires shoulld run through one side of the vehicle and audio cables on the other By following the above 2 points you can solve many of your noise problems 10 SPECIFICATIONS Input Current 0 5 amp max Power Supply 10 16 volts DC negative ground S NRatio gt 98dB Distortion 0 015 THD at 1KHz 0 015 I M at 1KHz Crossover Frequencies Continuously variable from 39Hz to 400Hz for front rear and subwoofer output Frequency Extender x 90 Continuously variable from 640Hz to 8 000Hz high pass for front channel output only Frequency Response 20Hz 30 2 34 8 Subwoofer Boost Single Boost 19dB at 45 80 190Hz Inputimpedance gt 10K ohms Output Impedance 41K ohms Crossover 5 19dB per octave 9nd order butterworth Output Voltage 6 volts max Output Gain 222 1 2 for front rear and subwoofer outputs Dimensions 142x214x42 mm W D H FUSE SP
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