

 B4R Bass Amplifier
Technical Specifications
OUTPUT POWER RATING | 1350 Watts   | 
  | 840 Watts   | 
  | 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)  | 
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TONE CONTROL RANGE  | 
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Bass:  | ±12dB @ 50Hz  | 
Ultra Mid: +7dB @ 800Hz,   | |
Treble:  | ±18dB @ 5kHz  | 
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GRAPHIC EQ LEVEL  | ±6dB  | 
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GRAPHIC EQ RANGE  | 
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33Hz:  | ±15dB  | 
80Hz:  | ±10dB  | 
150Hz:  | ±8dB  | 
300Hz:  | ±8dB  | 
600Hz:  | ±8dB  | 
900Hz:  | ±8dB  | 
2kHz:  | ±8dB  | 
5kHz:  | ±10dB  | 
8kHz:  | ±12dB  | 
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SIGNAL TO NOISE RATIO  | 75dB typical  | 
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FOOTSWITCH JACK  | Graphic EQ On/Off, Mute On/Off – Tip = Mute, Ring = EQ  | 
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POWER REQUIREMENTS  | 
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Domestic:  | 120VAC, 60Hz, 800VA  | 
Export:  | 100/115VAC 50/60Hz, 800VA  | 
  | 230VAC, 50/60Hz, 800VA  | 
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SIZE AND WEIGHT | 19/17.4”W x 5.6”H (with feet) x 15.5”D; 43 lbs | 
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Ampeg reserves the right to change specifications without notice.
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Ampeg is proudly Made in America. ©1999 SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
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