Ampeg B3158 Musical Instrument Amplifier User Manual
Contents
1. 18 output signal between the low and high fre quency output jacks Observe the minimum impedance ratings for each output 8 ohms for high 4 ohms for low The B3 has a single speaker output jack wired at the factory to its speaker enclo sure To use an external speaker cabinet disconnect the amplifier from the enclosure and connect it to the external cabinet using a speaker cable with 1 4 plugs Observe the 4 ohm minimum impedance rating The B328 has a single speaker output jack and two input jacks on its speaker cab inet WITH TWEETER and WITHOUT TWEETER Connect the speaker cable to the jack which gives you the best sound To use an external speaker cabinet discon nect the amplifier from the enclosure and connect it to the external cabinet using a speaker cable with 1 4 plugs Observe the 4 ohm minimum impedance rating limitador est impidiendo el aplanamiento clip ping de la se al de salida NOTA Hay dos circuitos Limitadores dentro del B3158 uno para su amplificador de potencia de frecuencias bajas y otro para su amplificador de potencia de frecuencias altas Todos los dem s modelos tienen un solo circuito Limitador y por lo tanto un solo LED de Limite 14 DIODO LED DE POTENCIA ENCENDIDA Este LED indicador se ilumina cuando se prende el interruptor de Potencia 15 15 INTERRUPTOR DE POTENCIA Este interrup tor de servicio pesado tipo vaiv n aplica la energ a de CA al amplificador2. 16 FUSIBLE Esto protege a la unidad con tra da os debidos a condiciones de sobrecar ga sobretensiones transitorias en la l nea de energ a Si el fusible se quema rep ngalo s lo con el mismo tipo y tama o 17 ENTRADA DE LA LINEA DE CA Conecte firmemente a este recept culo el cable suministrado de corriente de CA oprim i ndolo hasta que quede totalmente asenta do Enchufe el extremo macho del cord n a una salida aterrizada de CA NO PASE POR ALTO EL BORNE DE TIERRA DE LA CLAV IJA DE CA 18 SALIDA S DE LA S BOCINA S Esta secci n es diferente para cada de los tres modelos El B3158 aparece en la ilustraci n arriba El B3158 tiene dos amplificadores inter nos uno para las frecuencias agudas uno para las graves Cada secci n de amplifi cadores tiene su propio jack de salida para bocinas Este modelo viene cableado desde la f brica a su propio gabinete de bocinas el conector negro cola de cochino va al jack BAJO el gris al jack AGUDO Para utilizar gabinetes de bocinas externos desenchufe los conectores de los jacks y use cables para bocinas con clavijas de 1 4 para conec tar el ack BAJO a su gabinete de frecuen cias bajas y el ack de AGUDOS al gabinete de frecuencias altas Observe la especifi caci n de impedancias m nimas para cada Jack 8 ohms para los agudos 4 ohms para los bajos El B3 tiene un jack de salida para una sola bocina que vi
3. el amplificador se PRENDE en la posici n hacia arriba I y se APAGA en la posici n hacia abajo oe 5 B 3158 500 WATTS MAX 115VAC 60Hz HAE A I MADE IN THE U S A BY SLM ELECTRONICS EFFECTS pe UE Mo esas L POST 19 20 2122 23 24 The following chart shows the total impedance load when connecting speaker cabinets in parallel Total Impedance 40 80 40 H of Cabs Cabinet Impedance 89 160 160 19 EFFECTS RETURN To use an external effects device or other signal processor connect the OUTPUT of the device to this jack using a shielded cable This returns the processed signal into the amplifier s master section 20 EFFECTS SEND Connect the output from this jack to the INPUT of an external effects device using a shielded cable This sends a post EQ signal to your effects Since plugging a cable in here does not break the through connection to the power amp this jack can also be used as an unbalanced line out jack B The Rear Panel 21 PRE POST SWITCH You can select either pre or post EQ for the signal at the Balanced Out jack 23 with this switch With the switch in the OUT position the sig nal at the jacks will be pre EQ This is a direct output which is not affected by any EQ or boost settings With the switch depressed the signal is post EQ and is controlled and modified by the tone con trols Graphic EQ and Effects Loop 22 20dB SWITCH This switch adjusts the
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5. de las frecuencias medianas Gire el control del centro hacia la izquierda para lograr un sonido de contorno m s distante menor salida en el rango mediano del centro hacia la derecha para obtener un sonido realmente penetrante 8 AGUDOS Esta perilla sirve como el control pri mordial para las frecuencias altas Esto permite un rango de 17dB de refuerzo 22dB de recorte a 5kHz 9 EQ EN LED Este dlodo LED indicador se ilu mina cuando usted activa el EQ mediante el control Maestro 14 del panel delantero el interruptor de pie 24 del panel posterior 10 EQ GRAFICO Estos controles deslizantes cursores le permiten ajustar la salida de las fre cuencias que se muestran junto a cada control La posici n central de cada control es plana sin The Rear Panel HA H T FOR 100 120VAC 50 60Hz X T5A 250V FOR 220 240VAC 50 60Hz V T2 5A 250V e ID AC LINE IN SEE SERIAL NUMER LABEL FOR CORRECT VOLTAGE ane a e 16 17 16 FUSE This protects the unit from dam age due to overload conditions or power line surges In case of failure replace it only with the same size and type 17 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 18 SPEAKER OUTPUT S This section is different for each of the three models The B3158 is shown in the illustratio
6. instrument cable 2 15dB PAD This switch when depressed attenuates the input signal by 15dB Attenuation allows the Gain control 4 to be used in a more usable higher position If clipping is indicated with the Gain control at a low setting attenuation is needed 3 PEAK LED This LED flashes when the signal level into the preamp approaches clip ping Adjust the Gain control 4 until a strong signal from your instrument causes this LED to flicker NOTE If the LED flashes frequently with the Gain at a low setting use the 15dB pad 2 to attenuate the input signal and readjust the Gain 4 GAIN This serves as the input level con trol for the amplifier For the best signal to noise ratio set this control so the Peak LED 3 flashes when you strike a string fairly hard 5 DRIVE This control is used to overdrive the preamp in order to get various harmonic enhancement or distorted sounds In the fully counterclockwise position the preamp is in the cleanest condition As the control is rotat 1 ENTRADA Conecte aqu su guitarra de bajos usando un cable blindado para instrumentos 2 TERMINAL DE 15dB Si su bajo tiene capta dores de alta salida 0 circuitos electr nicos activos usted tal vez notar que el d odo LED de Picos 3 parpadea 6 permanece iluminado a n en posi ciones bajas del control de Ganancia 4 Conecte esta Terminal para conservar limpia la se al Esto atenuar la se al de entrada
7. the internal limiter is keeping the output from distorting NOTE There are two Limit LEDs only on the B3158 one for its low frequency power amp and one for its high frequency power amp 14 POWER ON LED This LED indicator illu minates when the POWER switch 15 is ON 15 POWER SWITCH This heavy duty rock er switch applies the power to the amplifier The amp is ON when the top of the switch is depressed OFF when the bottom of the switch is depressed mentar para impulsar el preamplificador con mayor fuerza hacia la distorsi n El tono de la serial tambi n cambia para proveer un sobreimpul so m s suave Tal vez tengan que ajustarse los controles de tono para obtener el tono general deseado El control de Ganancia 4 y la Terminal de 15dB 42 interaccionan con el control de Impulso Para un sobreimpulso mayor el interruptor de la Terminal debe estar apagado y el control de Impulso totalmente a favor de las manecillas del reloj Use el control de Ganancia para fijar la canti dad deseada de sobreimpulso El d odo LED de Picos 3 se iluminar en forma constante cuando el amplificadora se utilice de esta manera 6 BAJOS Esta perilla sirve como el control pri mordial para las frecuencias bajas Esto permite un rango de 8dB de recorte de refuerzo a 50Hz 3 MC EM B3 B328 B3158 Bass Amplifier The Front Panel Controls and Their Use 7 ULTRA MEDIANOS Este es el control primor dial para el rango
8. CE 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 IN HOURS SLOW RESPONSE 8 6 4 3 2 SOUND LEVEL dBA DURATION PER DAY 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 DANGER HAUTE TENSION 2 GRAPHICAL SYMBOLS GEFAHLICHE SPANNUNG IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL REFERREZ VOUS AU MANUAL D UTILISATION UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN B 3 B328 B3158 Bass Amplifier The Front Panel Controls and Their Use BASS ULTRA MID BALANCE 1 2 3 4 5 6 7 1 INPUT The signal output from an instru ment active or passive or a line level signal may be connected here by means of a shield ed
9. Owner s Guide for the c N AAA B3 B328 B3158 Bass Amplifier A ISo ag az az B3 B328 B3158 Bass Amplifier TABLE OF CONTENTS Introduction Features Important Safeguards and Precautions The Front Panel Controls and Their Use The Rear Panel Some Suggested Settings Troubleshooting System Block Diagram Technical Specifications An Introduction to your new Ampeg 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 an Ampeg B3 B328 B3158 Your new bass amplifier offers many outstanding features One hundred fifty watts of pure bass energy total tone con trol and rugged construction make each a true performer s bass amp Important Safeguards and Precautions Features In the world of high performance bass amps Ampeg amplifiers stand alone In true Ampeg tradition your new B3 B328 B3158 offers you more power performance and flexibility than any other bass amplifier in its class The outstanding features of your new amplifier features which set it apart from the competition are list ed below e 9 BAND GRAPHIC EQ Use as a second channel for bass solos or to shape the sound to your own exacting standards An independent level control lets you adjust the Graphic EQ volume e BALANCED LINE OUTPUTS Independent level control XLR type jack to patch into house consoles mixing boards or exter
10. RETORNO DE EFECTOS Para utilizar un dispositivo de efectos externo otro proce sador de se ales conecte la SALIDA del dis positivo a este jack usando un cable blinda do Esto alimenta la se al procesada a la sec ci n maestra del amplificador 20 ENVIO DE EFECTOS Conecte la salida de este jack a la ENTRADA de un dispositi vo de efectos externo usando un cable blinda do Esto env a una sefial post EQ a sus efec tos Siendo que la conexi n de un cable en este lugar no rompe la conexi n directa al amplificador de potencia esto se puede uti lizar como otra linea hacia afuera OA set to pre or post EQ by the Pre Post switch 21 The level can be adjusted for either mic or line type inputs using the 20dB switch 22 24 FOOTSWITCH This jack accepts the 1 4 plug from a 1 button footswitch allow ing remote control of the Graphic EQ on off function When a footswitch is used the front panel Master Pull EQ On switch 11 is bypassed 21 INTERRUPTOR PRE POST Usted puede seleccionar por medio de este inter ruptor ya sea pre post EQ para la se al en el ack de Salida Equilibrada 23 Con el interruptor en la posici n de FUERA la se al en los jacks ser pre EQ Esta es una salida directa no afectada por ningunas posiciones del EQ de refuerzo Con el interruptor hacia adentro la se al es post EQ y se controla y modifica mediante los controles de tono el EQ Gr fico y el Circuit
11. ene cableado desde la f brica a su propio gabinete de bocinas Para usar un gabinete externo de bocinas des enchufe el amplificador del gabinete y con 3 B328 B3158 Bass Amplifier output level at the Balanced Out jack 23 The switch works independently from the front panel Master control Depressing the switch activates the 20dB pad which allows patching into a mixer s mic input without overdriving it 23 BALANCED OUT This XLR type con nection supplies a balanced preamp output signal for connecting to a house mixing board recording console or external ampli fiers with balanced inputs The signal can be nectarlo a el gabinete externo Use un cable para bocinas con clavijas de 1 4 Observe la especificaci n de 4 ohms de impedancia como m nimo El B328 tiene un jack de salida para bocinas y dos jacks de entrada en el gabi nete de los bocinas internal WITH TWEET ER con la bocina de las agudos y WITH OUT TWEETER sin la bocina de las agu dos Para usar un gabinete externo de boci nas desenchufe el amplificador del gabinete y connectarlo a el gabinete externo Use un cable para bocinas con clavijas de 1 4 Observe la especificaci n de 4 ohms de impedancia como m nimo La tabla a continuaci n muestra la carga de impedancia total cuando se conecten gabi netes de bocinas en paralelo it de Gabinetes Impedancia de cada Gabinete Impedancia Total 8 ohms 16 ohms 16 ohms 19
12. ge 2 System Block Diagram 1 PEAK LED O n NEM LIMIT LED P D D D TONES 3 9 BAND EQ B3 B328 TN POWER INPUT AMP 05 O O SUE eee SPEAKER A LA L UT emren EQ ON T i GAIN DRIVE acc TREBLE ULTRA MID 1 B3158 Low LIMIT LED MASTER LOW SPEAKER AMP Ya 4 EFFECTS EFFECTS HIGH LIMIT LED SEND RETURN POST 2 HIGH Pm o O BALANCE IGH SHE Ex SPEAKER A BALANCED L GUT OUT 20dB A ISo am az az B3 B328 B3158 Bass Amplifier Technical Specifications OUTPUT POWER RATING B3 B328 150 Watts RMS 4Q load B3158 Low Freq 100 Watts RMS 4Q load High Freq 50 Watts RMS 8Q load POWER REQUIREMENTS 120VAC 60Hz 170VA 100 115VAC 50 60Hz 170VA 220 240VAC 50 60Hz 170VA TONE CONTROL RANGE Bass 8dB 50Hz Ultra Mid 5 17dB 500HZ Treble 17 22dB O 5KHZ GRAPHIC EQ RANGE 11dB O 40Hz 8dB 80 150 300 600 900 2kHz 9dB 9kHz GAIN 66dB typical tones center SIGNAL TO NOISE RATIO 7508 typical INTERNAL SPEAKERS B3 B328 B3158 Low Frequency Size Type 15 Ampeg Custom 1 8 Polypropylene 2 15 Ampeg Custom 1 Magnet 56 oz 30 oz 56 oz Voice Coil 2 5 1 5 2 5 Impedance 40 80 40 High Frequency Size Type N A Hi Efficiency Piezo 1 38 Polypropylene 1 Magnet 30 oz Voice Coil 1 Impedance 80 SIZE AND WEIGHT B3 B328 B3158 W x H x D 20 x26 x13 5 20 x18 75 x13 5 20 x34 5 x14 5 68 lbs 57 lbs 84 lbs c 2er www
13. hacia el preamplifi cador lo que le permitir obtener la mejor relaci n de se al a ruido para su bajo 3 DIODO LED DE PICOS Este LED se ilumi nar cuando cualquier etapa de preamplificaci n se encuentre cerca del punto de sobreimpulso Ajuste el control de Ganancia 4 hasta que una se al fuerte de su bajo cause un parpadeo de este LED 8 9 10 11 ed clockwise signal level is increased to drive the preamp harder into distortion The tone of the signal is also changed to provide a smoother overdrive The tone controls may have to be readjusted to obtain the overall desired tone The Gain control 4 and 15dB Pad 2 interact with the Drive control For greater overdrive the Pad switch should be out and the Drive control fully clockwise Use the Gain control to set the amount of overdrive desired The Peak LED 3 will illu minate steadily when the amp is used in this manner 6 BASS This is the primary low frequency control which allows for 12dB of cut or boost at 50Hz 7 ULTRA MID This is the primary midrange control Rotate this control to the left of center for a contoured sound more distant less midrange output or to the right of center for a pronounced more up front tone 8 TREBLE This is the primary high frequen cy control which allows for 22dB of cut or 17dB of boost at 5kHz 9 EQ ON LED This LED illuminates when the EQ is turned on by either the Master Control 11 or a footswi
14. lifier 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 cen ter 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 az CAUTION y Exe ATTENTION VORSICHT NE ND AM OUVRIR NICHT OFFENEN CAUTION TO MER THE RISK OF E Ue SHOCK ATTENTION POUR REDUIRE D ELECTROCUTION NE PAS VORSICHT ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT O NOT REMOVE COVE ENLEVER LE COUVERCLE AUCUNE PIECE INTERNE N EST REPRABLE DEN DECKEL ABENHMEN INTERNE TEILE KONNEN NICHT VOM NO T SERVICEABLE BERTE INSID 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 FOLLOW 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 REDU
15. n above The B3158 has two internal amplifiers one for the high frequencies one for the low Each amplifier section has its own speaker output jack factory wired to the internal speakers To use external speaker cabinets unplug the connectors from the jacks and use speaker cables with 1 4 plugs to connect the LOW jack to your low frequency cabinet and the HIGH jack to the high frequency cabinet Use the Balance control 12 front panel to proportion the RISK OF ELECTRIC DO NOT OPE refuerzo ni recorte Estos controles s lo afectan el sonido cuando el EQ es prendido 11 MAESTRO Fije mediante este control el nivel general de salida del amplificador El Circuito de Efectos y la Salida Equilibrada 19 20 23 no se ver n afectadas por el control Maestro Jalando el control Maestro se prende el EQ Gr fico 10 Cuando se utiliza el interruptor de pie se pasa por alto el interruptor del panel delantero 12 EQUILIBRIO SOLO EN EL B358 Este con trol var a el nivel de la serial entre las salidas de bajas y altas frecuencias v ase el 18 para ade cuar a n m s el sonido 13 DIODOS LED DE LIMITE Este LED indicador parpadear cada vez que se requiera el circuito lim itador interno para conservar limpia la sefial de sal ida del amplificador Esto indica que el amplificador est aproxim ndose a su salida m xima y que el SHOCK N SPEAKERS y 1 1 50 i 4 ATTS z m IMS 8 OH M L i MIN
16. n your particular instrument The Master control should be set to pro duce the appropriate output volume level The Graphic EQ can be used to tailor the amplifier to your speaker cabinets to compensate for room acoustics and to fine tune your sound B3 B328 B3158 Bass Amplifier Q A baz aga ar a Troubleshooting In the unlikely event that your B3 B328 B3158 should malfunction take a few minutes to troubleshoot it before you call for service You can save yourself time and money by doing it yourself and often the cure for the problem is something quite simple NO SOUND LEDs LIGHT LEDs DONT LIGHT Check amp controls check Check AC outlet for signal from instrument NO POWER OUTLET OK OK NO POWER NO SOUND SOUND OK Check power cord Check house fusebox or circuit breaker Listen for hum fuse power switch NO SOUND Check instrument cables POOR SOUND SOUND OK Check speaker s SPEAKER S OK POOR SOUND SPEAKER S DEFECTIVE Replace speaker s POOR SOUND J SOUND OK HUM Check speaker SPEAKER OK Unplug instrument touch tip of cable Check bass pickup 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 for servicing if it gets dropped has liquid spilled into it or sustains damage to its power cord see pa
17. nal power amplifiers e EFFECTS LOOP Connect your effects here for increased inten sity and quieter operation e DRIVE CONTROL To add harmonics for tube like overdrive e BALANCE CONTROL B3158 only To fine tune the mix between the Biamp High and Biamp Low outputs 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 e 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 degree incline since tipping or falling could occur possibly causing serious injuries e Always keep the total speaker impedance at or above the rated load Unplug the amplifier before cleaning it NEVER spray liquid cleaners onto the amp
18. o de Efectos 22 INTERRUPTOR DE 20dB Este interrup tor ajusta el nivel de salida en el jack de Salida Equilibrada 23 El interruptor fun ciona independientemente del control Maestro del panel delantero Al oprimirse el interruptor hacia adentro se activa la terminal de los 20dB lo que permite conectarse a las entradas para micr fonos en un mezclador sin sobreimpulsarlos 23 SALIDA EQUILIBRADA Esta conexi n tipo XLR proporciona una se al de salida equilibrada de preamplificaci n para conec tarse a un tablero mezclador local una con sola grabadora amplificadores externos con entradas equilibradas La serial se puede establecer como pre post EQ mediante el interruptor Pre Post 21 El nivel se puede ajustar para entradas de tipos ya sean de micr fono de l nea utilizando el interruptor de 20dB 22 24 INTERRUPTOR DE PIE Este jack acepta la clavija de 1 4 de un interruptor de pie de un solo bot n lo que permite un con trol remoto de la funci n de prender apagar del EQ Gr fico Cuando se utiliza un interrup tor de pie se pasa por alto el interruptor Maestro para Prender Jalar el EQ 11 A Lb hav age a B3 B328 B3158 Bass Amplifier Some Suggested Settings ROCK ULTRA MID TREBLE 10 JAZZ ULTHA MID THEBLE c 0 COUNTRY ULTHA MID THEBLE lt FUNK POPPING ULTRA MID TREBLE 2 O The setting of the Gain control depends o
19. tch 24 rear panel NOTA Si el LED permanece iluminado a n con la Ganancia en una posici n baja utilice la Terminal de 15dB 2 para atenuar la se al de entrada y reajuste la Ganancia 4 GANANCIA Esto sirve como el control de nivel de entrada para el amplificador Para lograr la mejor relaci n de se al a ruido fije este control para que el LED de Picos 3 parpadee cuando usted pulse con fuerza alguna cuerda 5 IMPULSO Este control se usa para sobreim pulsar el preamplificador a fin de conseguir varios realces arm nicos sonidos de distorsi n En la posici n totalmente contraria a las manecillas del reloj el preamplificador se encontrar en la posici n m s limpia Conforme el control se gire a favor de las mane cillas del reloj el nivel de la se al se incre 12 13 14 15 10 GRAPHIC EQ These sliders control the output frequencies indicated above each con trol The center position of each control is flat no boost or cut 11 MASTER Set the overall output level of the amplifier with this control Pulling this knob out actives the Graphic EQ 10 When a footswitch is connected 24 rear panel this switch is disabled 12 BALANCE B3158 only This control proportions the output signal between the low and high frequency output jacks see 18 rear panel when using the amp in the biamp mode 13 LIMIT LED S The LED illuminates whenever the amplifier is near full output indicating that
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