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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 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 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" = = 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: • 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 • BALANCED LINE OUTPUTS: Independent level control. XLR type jack to patch into house consoles, mixing boards, or external power amplifiers • EFFECTS LOOP: Connect your effects here for increased inten- sity and quieter operation • DRIVE CONTROL: To add harmonics for tube-like overdrive • BALANCE CONTROL (B3158 only): To fine tune the mix between the Biamp High and Biamp Low outputs SOUND LEVEL dBA DURATION PER DAY SOUND LEVEL dBA DURATION PER DAY SLOW RESPONSE IN HOURS SLOW RESPONSE IN HOURS 90 8 102 1-1/2 92 6 105 1 95 4 110 1/2 97 3 115 1/4 or less 100 2 3 The Front Panel Controls and Their Use MASTER -12dB 0 +12dB 40Hz 80Hz 150Hz 300Hz 600Hz 900Hz 2kHz 5kHz 8kHz -15dB PAD PEAK LIMIT ON INPUT GAIN DRIVE BASS ULTRA MID TREBLE PULL EQ ON LO FLAT HI EQ ON BALANCE LOW HIGH 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 B3/B328/B3158 Bass Amplifier 1. INPUT: The signal output from an instrument (active or passive) or a line level signal may be connected here by means of a shielded 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) posit...

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