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Ampeg reserves the right to change specifications without notice.
Ampeg is proudly Made in America. ©1999 SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
P/N 47-588-03 • 10/99
B3/B328/B3158 Bass Amplifier
Technical Specifications
OUTPUT POWER RATING
B3, B328: 150 Watts RMS, 4Ω load
B3158: Low Freq - 100 Watts RMS, 4Ω load
High Freq - 50 Watts RMS, 8Ω 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 @ 5KHZ
GRAPHIC EQ RANGE ±11dB @ 40Hz; ±8dB @ 80, 150, 300, 600, 900, 2kHz; ±9dB @ 9kHz
GAIN 66dB typical, tones @ center
SIGNAL TO NOISE RATIO 75dB 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: 4Ω 8Ω 4Ω
High Frequency: Size/Type: N/A Hi-Efficiency Piezo (1) 8” Polypropylene (1)
Magnet: 30 oz
Voice Coil: 1”
Impedance: 8Ω
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.
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