Ampeg B4R User's Manual
Contents
1. In the example shown below the B4R s two internal power amplifiers will power both a full range cabinet and a low frequency cabinet The crossover point is determined by the Biamp Frequency control 16 Set the Stereo Mono Bridge switch to the OUT Stereo position and connect the system as follows A Lai HHI AG ip Ar 6 AET Biamp Full Range Lows O e JO T LOW FREQ CABINET S 1 Connect a shielded cable from the B4R s Biamp Low Out jack to its Power Amp A Power Amp In jack 2 Connect a speaker cable from the B4R s Power Amp A Speaker Output jack to the input jack of the low frequency cabinet s 3 Connect a speaker cable from the B4R s Power Amp B Speaker Output jack to the input jack of the full range cabinet s B4R Bass Amplifier Q A bavzgnez aye In the example shown below the B4R s two internal power amplifiers will power both a high frequency cabinet and a low frequency cabinet The crossover point is determined by the Frequency control 16 Set the Stereo Mono Bridge switch to the OUT Stereo position and connect the system as follows Biamp e HHT Highs Lows l HIGH FREQ E ee f CABINET S i Low REO 1 Set the Full Range Biamp switch to the IN Biamp position 2 Connect a speaker cable from the B4R s Power Amp A Speaker Output jack to the input jack of the low frequency cabinet s 3 Connect a speaker cable from the B4R s Power Amp B Spe2. STEREO BRIDGED PREAMP OUT B Speakon is a registered trademark of Neutrik AG 11 A A Azzy az ag B4P Bass Amplifier Technical Specifications OUTPUT POWER RATING TONE CONTROL RANGE Bass Ultra Mid Treble GRAPHIC EQ LEVEL GRAPHIC EQ RANGE 33Hz 80Hz 150Hz 300Hz 600HZz 900Hz 2kHz 5kHz 8kHz SIGNAL TO NOISE RATIO FOOTSWITCH JACK POWER REQUIREMENTS Domestic Export SIZE AND WEIGHT 1350 Watts Mono Bridged 4 Ohms 1000 Watts Continuous 840 Watts Mono Bridged 8 Ohms 680 Watts Continuous 2 x 675 Watts 2 Ohms 500 Watts Continuous 2 x 420 Watts 4 Ohms 340 Watts Continuous 2 x 255 Watts 8 Ohms 205 Watts Continuous 12dB 50Hz 7d0B 800Hz 7dB 400Hz 18dB 5kHz 6dB 15dB 10dB 8dB 8dB 8dB 8dB 8dB 10dB 12dB 75dB typical Graphic EQ On Off Mute On Off Tip Mute Ring EQ 120VAC 60Hz 800VA 100 115VAC 50 60Hz 800VA 230VAC 50 60Hz 800VA 19 17 4 W x 5 6 H with feet x 15 5 D 43 Ibs ay cS O HA zape eae www ampeg com Ampeg is proudly Made in America 1999 SLM Electronics 1400 Ferguson Avenue St Louis MO 63133 U S A P N 47 618 03 07 99
3. your new Ampeg B4R Bass Amplifier Thank you for making one of the best choices you will ever make for your musical career choosing one of the finest bass amps available the Ampeg B4R This versatile and powerful bass amplifier delivers up to 1350 watts of unsurpassed musical power and offers several outstanding features All of the features and controls of your B4R are covered in detail within the pages of this owner s guide We recommend going over them before you use the amplifier Features In the world of high performance bass amps Ampeg amplifiers stand alone In true Ampeg tradition the B4R offers you more power performance and flexibility than any other bass amplifier in its class The out standing features of your new amplifier features which set it apart from the competition are listed below e DUAL SEPARATE POWER AMPLIFIERS Operate in true stereo or mono bridged mode for even greater output power page 6 8 9 e BIAMP CAPABLE Adjustable crossover frequency control Low to high frequency balance control page 5 8 9 e 5 POSITION STYLE CONTROL Take your pick from five different tone variations to best suit your playing style page 4 e TEXTURE CONTROL Changes your tone for a more aggressive sound page 4 e 9 BAND GRAPHIC EQ Switchable at front panel or with a footswitch you can use this as a second channel for bass solos or to shape your sound to your own exact ing standards An independent level con
4. In the Biamp Mode Channel A Low Input Channel B High Input See pages 8 and 9 29 31 PREAMP OUTPUTS These jacks are direct preamp outputs for use with external power amplifiers mixing boards external effects etc Connect the external unit inouts to these jacks using shielded instrument cables Speakon is a registered trademark of Neutrik AG B4R Bass Amplifier Q A bez zgn eae The Rear Panel Con t 33 34 35 36 37 38 39 40 41 LINE OUT E FECTS LOOP PRE BE DOST m m 2 LOW ND OUTPUT LEVEL rds sown TONT or 2 OKO Y CH B CHA OHMS STEREO OHMS STEREO AE C P HOT 1 C CHANNEL A M LOAD S MONO BRIDGE M LOAD y CHANNEL STEREC p ER A EE BIAMP HIGH TS ONO INPUT POWER AMP B BI AMP POWER AMP PREAMP NPUT POWER AMP A POWER AMP BIAMP LOW MONO BRIDGE INPUT 26 27 28 29 30 31 32 FOOTSWITCH Connect a two button footswitch to this jack for remote Mute and EQ On Off control On the stereo 1 4 plug the tip controls Mute and the ring controls EQ On Off When a footswitch is connected the Mute switch 3 can still be used however the EQ switch 12 is dis abled 33 BIAMP HIGH LOW OUTPUTS When using the amplifi er in the biamp mode the Biamp High Out jack carries the high frequency signal and the Biamp Low Out jack carries the low frequency signal See pages 8 and 9 34 LINE OUT LEVEL This controls the strength of the sig nal at the
5. Line Out jacks 37 38 and works independently from the Master control 14 35 LINE OUT PRE POST SWITCH The signal at the Line Out jacks can be set to either Pre or Post EQ with this switch With the switch in the OUT position the signal at the jacks will be Pre EQ This is a direct output not affected by any preamp tone settings With the switch IN the signal is Post EQ and is controlled and modified by the tone controls Graphic EQ and the effects loop 36 LINE OUT GROUND LIFT This switch disconnects the ground pin of the line Out XLR jack 37 which may help G LIFT m BAL UNBAL RETURN e IN PREAMP OUTPUT INPUT OUTPUT MODEL B4R FT SW GRAPHIC EQ MUTE F u reduce residual hum and buzz sometimes picked up in line out signal cables The ground is lifted when the switch is depressed 37 38 LINE OUT JACKS These jacks supply a pre Master line level signal for connection to a house mixing board recording console or external amplifier s The XLR type jack 37 provides a balanced signal the 1 4 jack 38 pro vides an unbalanced signal The signal level at these jacks is controlled by the Line Out Level control 34 and is gov erned by the Pre Post switch 35 39 EFFECTS LOOP RETURN When using external effects connect the effect s output into this jack using a shielded instrument cable 40 EFFECTS LOOP SEND When using an external signal processor connect this jack to the input
6. OW THESE PRECAUTIONARY GUIDELINES WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT OPEN CHASSIS DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER CORD CONNECT ONLY TO A PROP ERLY GROUNDED AC POWER OUTLET CAUTION TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE CAUTION NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL CAUTION OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME The chart below shows the U S Government Occupational Safety and Health Administration OSHA regulations which were in effect at the time of this publication for permissible noise exposure per 29CRF1910 Table G 16 SOUND LEVEL dBA DURATION PER DAY SOUND LEVEL dBA DURATION PER DAY SLOW RESPONSE IN HOURS SLOW RESPONSE IN HOURS 1 1 2 1 1 2 1 4 or less According to OSHA any exposure in excess of those listed above could result in some hearing loss EXPLANATION OF DANGEROUS VOLTAGE IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL i j REFERREZ VOUS AU MANUAL D UTILISATION GRAPHICAL SYMBOLS DANGER HAUTE TENSION GEFAHLICHE SPANNUNG UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN B4R Bass Amplifier Q bhor aS An Introduction to
7. Owner s Guide for the OA Bass Amplifier A A baz agp eae B4R Bass Amplifier TABLE OF CONTENTS Important Safeguards and Precautions Introduction Features The Front Panel Controls and Their Use The Rear Panel Connections Mono Bridged Dual Mono Biamp Full Range and Lows Biamp Highs and Lows Biamp With Second Amplifier Some Suggested Settings Rack Mounting Troubleshooting System Block Diagram Technical Specifications Important Safeguards and Precautions All Ampeg products are designed for continuous safe operation as long as common sense is used and steps are taken to help avoid certain problems Abiding by the following rules can help prevent damage to your amplifier yourself and others e The amplifier is equipped with a three pronged AC power cord To reduce the risk of electrical shock NEVER remove or otherwise attempt to defeat the ground pin of the power cord Connect the amplifier ONLY to a properly grounded AC outlet of the proper voltage for your amp Avoid sudden temperature extremes rain and moisture Also avoid sudden and intense impact If the unit has been subjected to any of the preceding abuses have it looked at by an authorized service center NEVER set the amplifier on a support that might give out under its weight e Whenever using tall or stacked speaker cabinets use them ONLY on a level surface NEVER set tall or stacked cabinets on a surface with more than a five degre
8. aker Output jack to the input jack of the high frequency cabinet s In the example shown below the B4R s two internal power amplifiers are bridged together and will power the low frequency cabinet s A second amplifier will be used to power the high frequency cabinet s The crossover point is determined by the Frequency control 16 Set the Stereo Mono Bridge switch to the IN Mono Bridge position and connect the system as follows PIANE BIAMP Biamp with a Iie ni nies Second Amp a pDA z J HIGH FREQ CABINET S T LOW FREQ CABINET S Connect a shielded cable from the B4R s Biamp High Output jack to the Input jack of the High Frequency power amplifier Connect a shielded cable from the B4R s Biamp Low Output jack to its Power Amp A Input jack reels ne high frequency power amp s Speaker Output jack to the input jack s of the high frequency cabinet s Observe amplifiers minimum oad rating Connect a heavy duty speaker cable terminated with a Speakon connector or dual banana plugs from the B4R s Mono Bridge Biamp Output jack to the input jack of the low frequency speaker cabinet Speakon pin 1 2 Banana Mono Mono KR UN Speakon is a registered trademark of Neutrik AG A o r gaz a az B4P Bass Amplifier 10 Some Suggested Settings R O CK ULTRA MID TREBLE Since so many variables affect the actual sound of any system the following settings are offered a
9. amplifier in the biamp mode 17 BALANCE This control adjusts the relative level between the low and high frequency biamp signals when using the amplifier in the biamp mode The Front Panel Controls and Their Use Cont 22 BALANCE a 1kHz LO HI 18 9 BAND GRAPHIC EQ These sliders control the ampli tude of the frequencies indicated above each control The center position of each control is flat sliding the control upward will increase the output level of that frequency slid ing the control downward will decrease it The Graphic EQ can be used in two ways 1 To fine tune your sound make small adjustments at the desired frequencies and leave the EQ on throughout the entire session This is great for adapting to varying room acoustics when going from club to club etc 2 For a completely different sound make larger adjustments and only activate the EQ when you want a second channel sound such as during bass solos 19 LEVEL This is the output volume control for the Graphic EQ and only affects the signal when the EQ is engaged If the EQ d signal is too soft slide the Level control up if it s too loud slide the control down 20 POWER LED This LED glows green when the Power Switch 22 is ON 21 ACTIVE LED This LED illuminates when the EQ is on 22 POWER This heavy duty rocker switch applies the power to the amplifier the amp is ON when the top of the Switch is depressed OFF when the botto
10. d instrument cable The signal at this jack is sent into the preamp at full amplitude 2 15dB INPUT The signal output from an instrument active or passive typically active or a line level signal may be connected here by means of a shielded instrument cable The signal at this jack is padded 15dB before it is sent into the preamp 3 MUTE This switch when depressed mutes all outputs except the Tuner Out 41 A footswitch can also control muting if the Mute switch on the front panel is left in the out position The front panel switch is still active with a footswitch connected This is excellent for tuning your bass with an electronic tuner without having to adjust any levels or turn down your house volume 4 TEXTURE This switch adds a tube emulation stage which changes the tone for a more aggressive sound Using the Texture switch you can overdrive the amplifier without typical and harsh sounding solid state clipping 5 GAIN This control sets the level of the signal entering the preamp stage Adjust this control until the Peak LED 6 flashes on strong signal peaks but is not illuminated con stantly while playing To obtain the best signal to noise ratio set the Gain control as described above and adjust the Master 14 to obtain the desired volume level 6 PEAK LED This LED will illuminate when the signal entering the preamp stage is near the clipping level Adjust the Gain control 5 until a str
11. e incline since tipping or falling could occur possibly causing seri Ous injuries e Always keep the total soeaker impedance at or above the rated load e Unplug the amplifier before cleaning it NEVER spray liquid cleaners onto the amplifier Wipe it with a slightly dampened lint free cloth to remove dirt and film e Don t use the amplifier if it has sustained damage to the chassis controls or power cord Refer the unit to an authorized service center for inspection e Amplifiers capable of producing high volume levels are also capable of inflicting permanent hearing loss or damage if the exposure to such levels is prolonged Such damage is progressive and irreversible CAUTION ATTENTION VORSICHT DO NOT OPEN NE PAS OUVRIR NICHT OFFENEN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK ATTENTION POUR REDUIRE D ELECTROCUTION NE PAS VORSICHT ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT DO NOT REMOVE COVER ENLEVER LE COUVERCLE AUCUNE PIECE INTERNE N EST REPRABLE DEN DECKEL ABENHMEN INTERNE TEILE KONNEN NICHT VOM NO USER SERVICEABLE PARTS INSIDE PAR L UTILISATEUR POUR TOUTE REPARATION S ADRESSER A UN BENUTZER GEWARTET WERDEN DIE WARTUNG IS QUALIFIZIERTEM REFER SERVICING TO QUALIFIED SERVICE PERSONNEL TECHNICIEN QUALIFIE WARTUNGSPERSONAL ZU UBERLASSEN THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION IN ORDER TO PROLONG THE LIFE OF THE UNIT AND PREVENT ACCIDEN TAL DAMAGES OR INJURY PLEASE FOLL
12. lent to a series effects loop and should be used with such devices as limiters and equalizers B4R Bass Amplifier 19 20 21 2kHz SkHz 8kHz LEVEL POWER Ba4R ACTIVE TREBLE EFFECTS MIX GRAPHIC EQ MASTER FREQUENCY 300Hz 10 11 12 13 14 15 16 12 GRAPHIC EQ This switch activates the graphic equaliz er When a footswitch is used this switch is disabled 13 LIMIT DEFEAT The B4R employs internal limiter circuits to help keep the power amplifier s output clean at extreme volume levels All amplifiers may begin to clip their output signals as they approach maximum output levels resulting in potentially soeaker damaging distortion These circuits may be disabled by depressing this switch This may result in an increase in output power but also increases the possibility of distortion Use discretion whenever playing with the Limit cir cuits off 14 MASTER This control sets the overall output level of the amplifier For the lowest possible noise level adjust the Gain control as described in 5 and use this control to obtain the desired volume level 15 LIMIT LED This LED will flash any time the internal limit circuit is called upon to keep the amplifier s output signal clean This indicates that the amplifier is nearing full output and the limiter is keeping it from clipping the output signal 16 FREQUENCY This control sets the crossover point between the Biamp High and Biamp Low Outputs when using the
13. m of the switch is depressed 6 7 aar A Ior zgr a az B P Bass Amplifier The Rear Panel MONO BRIDGE 1 HOT 2 RETUR AC LINE IN 23 CIRCUIT BREAKER The B4R employs an AC line circuit breaker to help protect against damage due to excessive cur rent demands If the amplifier stops working check the circuit breaker If it has opened the button will be protruding and showing a contrasting color You can reset the circuit breaker by pushing it in until it latches The breaker must cool down for a short time before the button will latch If the circuit breaker Opens repeatedly have the amplifier checked by a qualified service person 24 AC LINE IN Firmly insert the supplied AC power cord into this socket until it is fully seated Plug the male end of the cord into a grounded AC outlet DO NOT DEFEAT THE GROUND PRONG OF THE AC PLUG 25 SPEAKER OUTPUTS The 1 4 jacks offer a convenient method of connecting to speaker cabinets using cables termi nated with 1 4 plugs However when using the amplifier at or near its full output power using the five way binding posts domestic units or Speakon jacks export units is recommend ed The binding posts Speakon jacks must be used when oper ating in the Mono Bridged mode See pages 8 and 9 26 FULL RANGE BIAMP This switch determines how the signal is sent to the internal amplifiers In the Full Range posi tion switch out a full range signal is sent to b
14. of the effect using a shielded instrument cable 41 TUNER OUT This jack is provided for connection to an electronic tuner and is always live even when the Mute Switch 3 is engaged allowing for silent tuning as well as a monitor feed which remains active when the house mix is muted A Aber zgr a azg B P Bass Amplifier Connections In the example shown below the B4R s two internal power amplifiers are bridged together to produce maximum output power Set the Stereo Mono Bridge switch to the IN Mono Bridged position and connect the system as follows FULL RANGE Mono CABINET S Bridged 1 Connect a heavy duty speaker cable terminated with a Speakon connector or dual banana ou from the B4R s Mono Bridge Biamp Output jack to the input jack of a speaker cabinet capable of handling the extremely high output power Speakon pin 1 2 Banana Mono Mono In the example shown below the B4R s two internal power amplifiers will each power a set of full range cabinets Set the Stereo Mono Bridge switch to the OUT Stereo position and connect the system as follows Dual Mono FULL RANGE CABINET S P FULL RANGE CABINET S 1 Connect a speaker cable from the B4R s Power Amp A Speaker Output jack to the input jack s of a set of full range speakers 2 Connect a speaker cable from the B4R s Power Amp B Speaker Output jack to the input jack s of another set of full range speakers
15. ong signal from your instru ment causes this LED to flicker 18 33Hz 80Hz 150Hz 300Hz 600Hz 900Hz 12dB 7 mm am am 12dB GAIN STYLE BASS 1 ULTRA MID MUTE 72345 A OG 7 STYLE This five position switch allows you to vary the tone of the amplifier The following table lists each of the dif ferent settings experiment with the Style and other EQ con trols 8 9 10 18 19 for the results which suit you best POSITION 1 Fully scooped mids mid cut POSITION 2 Traditional passive tone setting POSITION 3 Basically flat POSITION 4 Boosted high end POSITION 5 Basically flat with low end roll off for loud playing without muddiness 8 BASS This is the primary low frequency control which allows 12dB of cut or boost at 50Hz The low frequency out put is flat at the center position 9 ULTRA MID This is the primary midrange control which allows 7dB of cut at 400Hz or boost at 800Hz The midrange output is flat at the center position 10 TREBLE This is the primary high frequency control which allows 18dB of cut or boost at 5kHz The high fre quency output is flat at the center position 11 EFFECTS MIX This control varies the mix between the direct dry signal and the effects wet when the effects loop 39 40 is used Full counterclockwise results in all direct signal no effect and full clockwise gives all effect and no direct signal The clockwise position is equiva
16. or ser vice You can save yourself time and money by doing it yourself NOKSTO 6 N18 or circuit breaker LEDs LIGHT Check amp controls check for signal from bass Check power cord fuse power switch Listen for hum Check speaker Unplug bass touch tip of cable NO CHANGE Replace cable NO CHANGE SEE BELOW and often the problem is something quite simple POOR SOUND Check bass cables POOR SOUND Check speaker s SPEAKER S OK POOR SOUND SPEAKER S DEFECTIVE Replace speaker s POOR SOUND SEE BELOW If the problem isn t covered above or if the steps lead you here then contact your Ampeg dealer for service informa tion Also you should refer your amp to an authorized service center if it gets dropped has liquid spilled into it or sustains damage to its power cord see page 2 System Block Diagram PEAK LED rp ro 0dB INPUT GAIN 15aB INPUT e e STYLE UNBAL LINE OUT BAL e GROUND LIFT LEVEL MASTER EFFECTS i SEND EFFECTS MIX EFFECTS RETURN BRIDGE MONO STEREO BIAMP l i FULL RANGE KX STEREO i EQ IN 9 BAND GRAPHIC BASS ULTRA MID TREBLE e X9 LEVEL SLIDERS DOMESTIC BINDING LIMIT DEFEAT POWER i AMP IN A MONO PREAMP OUT A MONO SPEAKON JACK F MONO RIDGE BIAMP LIMIT LED
17. oth amp chan 33 AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRI WARNING TO eae ue RISK F FIRE OR ELECTRIC SHO O NOT EXPOSE THs APPLIANCE renin OR MOIST A AO CAUTION RISK OF ELECTRIC SHOCK silt iar _ prince F CONN 350 WATTS CH 4 OHMS STEREO 500 WATTS CH 2 OHMS STEREO 2 OHM MINIMUM LOAD 1000 bii 4 OHMS A BRIDGE 4 OHM MINIMUM LOA HIGH Een OUTPUT OUTPUT BIAMP 1 LOW HOT 1 LOW TUR 2 HIGH HOT 2 HIGH F RETURN MADE IN THE U S A BY SLM ELECTRONICS 1400 FERGUSON AVENUE ST LOUIS MO 63133 SPEAKER CHANNEL B OUTPUTS CHANNEL A 29 nels In the Biamp position switch in the low frequencies are sent to Channel A and the high frequencies are sent to Channel B See pages 8 and 9 NOTE When Biamping the Stereo Mono switch 27 must be set to Stereo See pages 8 and 9 27 STEREO MONO This switch sets the operating mode of the amplifier In the out position the amplifier is in the Stereo Mode with the switch in the in position the amplifier is in the Mono Bridged Mode See pages 8 and 9 28 30 POWER AMP INPUTS These jacks connect directly to the power amp for use with external preamps When using external sources connect the OUTPUT of the sources to these jacks using shielded instrument cables to feed the sig nals into the power amp sections The internal signal is dis connected when a plug is inserted In the Mono Mode Channel A Input
18. s starting points to help you find the exact sounds your playing demands When using the B4R please keep in mind the following points JAZZ e The Gain control should be adjusted until the peak LED flashes on strong signals This level will vary depending on your instrument and playing style e The Master control should be COUNTRY set to produce the appropriate output volume level e The Graphic EQ can be used to further fine tune these basic suggested setting to extend the frequency response of the cabinet being used to com pensate for room acoustics or BRIGHT to act like a second channel FUNK POPPING Rack Mounting When mounting the amplifier into a rack the four bottom feet should be removed to maintain the three rack space height of the ampli fier Be sure to keep the feet and their attachment bolts for future use If the feet are reinstalled never use screws which will protrude farther into the amplifier than the original hardware The rack must be a high quality enclosure capable of securely supporting the weight of the amplifier Tighten the mounting screws securely through the amplifier s face plate into the rack rails Check the rack and mounting screws occasionally to ensure a continual ly safe and secure installation B4R Bass Amplifier Troubleshooting 6 7 ear In the unlikely event that your B4R should malfunction take a few minutes to troubleshoot it before you call f
19. trol lets you adjust the Graphic EQ volume page 5 e EFFECTS MIX Varies the amount of external effects mixed into the signal page 4 5 e TUNER OUT JACK Allows connection to an electronic tuner and provides an always live monitor feed even when the output is muted page 7 e HEAVY DUTY SPEAKER JACKS For more reliable connections at higher outputs and for mono bridged connections dual binding posts domestic units or Speakon jacks export units page 6 7 e BALANCED AND UNBALANCED LINE OUTPUTS Independent level control Balanced XLR and unbalanced 1 4 output jacks Switchable pre or post EQ page 7 e EFFECTS LOOP Connect your effects here for increased intensity and quieter oper ation page 7 e POWER AMP IN PREAMP OUT Two separate loops one for each channel a sepa rate preamp may be connected to the Power Amp In jack and the Preamp Out jack may be connected to a slave amp page 6 7 e FOOTSWITCH CONTROL Use a footswitch to activate the Graphic EQ and the Mute feature page 6 7 e CIRCUIT BREAKER PROTECTION A heavy duty resettable circuit breaker provides protection against fault conditions page 6 Speakon is a registered trademark of Neutrik AG A Ior zgr a az B P Bass Amplifier The Front Panel Controls and Their Use INPUT 1 0dB INPUT The signal output from an instrument active or passive typically passive or a line level signal may be connected here by means of a shielde
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