Ampeg b 4r users guide

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2 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. -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 ONLYto 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.) -NEVERset the amplifier on a support that might give out under its weight. -Whenever using tall or stacked speaker cabinets, use them ONLYon a level surface. NEVERset tall or stacked cabinets on a surface with more than a five degree incline since tipping or falling could occur, possibly causing seri- ous injuries. -Always keep the total speaker impedance at or above the rated load. -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. -Dont 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. -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! CAUTIONRISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. ATTENTIONRISQUE D'ELECTROCUTION NE PAS OUVRIR ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER A UN TECHNICIEN QUALIFIE. VORSICHTELEKTRISCHE SCHLAGGEFAHR NICHT OFFENEN VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM WARTUNGSPERSONAL ZU UBERLASSEN. THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE UNITAND 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 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. According to OSHA, any exposure in excess of those listed above could result in some hearing loss. "IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL" "REFERREZ-VOUS AU MANUAL D'UTILISATION" "UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN" EXPLANATION OF GRAPHICAL SYMBOLS: "DANGEROUS VOLTAGE" "DANGER HAUTE TENSION" "GEFAHLICHE SPANNUNG"= = SOUND LEVEL dBA DURATION PER DAY SLOW RESPONSE IN HOURS 90 8 92 6 95 4 97 3 100 2SOUND LEVEL dBA DURATION PER DAY SLOW RESPONSE IN HOURS 102 1-1/2 105 1 11 0 1 / 2 115 1/4 or less TABLE OF CONTENTS Important Safeguards and Precautions . . . . . . . . . . . . . . .2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 The Front Panel Controls and Their Use . . . . . . . . . . . . .4,5 The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6,7 Connections: Mono Bridged . . . . . . . . . . . . . . . . . . . . . .8 Dual Mono . . . . . . . . . . . . . . . . . . . . . . . . .8 Biamp, Full Range and Lows . . . . . . . . . . .8 Biamp, Highs and Lows . . . . . . . . . . . . . . .9 Biamp With Second Amplifier . . . . . . . . . . .9 Some Suggested Settings . . . . . . . . . . . . . . . . . . . . . . . .10 Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .11 Technical Specifications . . . . . . . . . . . . . . . . . . .back cover B4R Bass Amplifier

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3 An Introduction to 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 owners 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. -DUAL SEPARATE POWER AMPLIFIERS:Operate in true stereo or mono bridged mode for even greater output power (page 6,8,9). -BIAMP CAPABLE:Adjustable crossover frequency control. Low-to-high frequency balance control (page 5,8,9). -5-POSITION STYLE CONTROL:Take your pick from five different tone variations to best suit your playing style (page 4). -TEXTURE CONTROL:Changes your tone for a more aggressive sound (page 4). -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 control lets you adjust the Graphic EQ volume. (page 5). -EFFECTS MIX:Varies the amount of external effects mixed into the signal (page 4,5). -TUNER OUT JACK:Allows connection to an electronic tuner and provides an always live monitor feed even when the output is muted (page 7). -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). -BALANCED AND UNBALANCED LINE OUTPUTS:Independent level control. Balanced XLR and unbalanced 1/4 output jacks. Switchable pre or post EQ (page 7). -EFFECTS LOOP:Connect your effects here for increased intensity and quieter oper- ation (page 7). -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). -FOOTSWITCH CONTROL:Use a footswitch to activate the Graphic EQ and the Mute feature (page 6,7). -CIRCUIT BREAKER PROTECTION:A heavy duty resettable circuit breaker provides protection against fault conditions (page 6). Speakon ®is a registered trademark of Neutrik AG. B4R Bass Amplifier