B-52 Pro

B-52 US-4000 Professional Power Amplifier

  • Sale
  • Regular price $759.99
Shipping calculated at checkout.

Designed to provide outstanding performance on any stage, in the clubs, and on the road.
The B-52 US-4000 Power Amplifier features low noise, low distortion circuitry and high current output stages. B-52 uses oversized toroidal transformers and large filter capacitors to deliver super clean, fist pumping output even when driving a 2-ohm speaker load. 
All B-52 US-series power amplifiers use the most reliable linear output devices to provide ultra-low distortion and ruler flat frequency response. The stellar looking B-52 US-Series professional power amplifiers are made to outperform in any setting. Backed by a 3-year warranty.
  • Compact 2-rack size
  • High-current toroidal transformers for greater 2-ohm power
  • 21-position detent gain control knobs for consistent settings
  • Front panel LED display: Power, bridge and parallel LEDs and signal,
  • 20dB, -10dB, 0dB, clip and protect LEDs for each channel
  • Protection: short circuit, output current limiting, thermal, DC offset, turn on/off muting, RF protection and circuit breaker
  • Clip limiters reduce distortion without sacrificing peak performance (defeatable on US-3000/US-4000)
  • Sub-sonic filters protect speakers and increase headroom (defeatable)
  • Balanced combo XLR and ¼" TRS input connectors and link XLR output connectors
  • 5-Way binding post and Speakon™ outputs
  • Low-noise cooling fans with continuously variable speed and highly efficient front-to-rear forced air keeps the amplifiers cool
Get the super-clean power you need for any gig.
Amplifier Specifications
Stereo Both Channel Driven @ 1kHz, 1%THD
  • 8 Ohms - 700 watts
  • 4 Ohms - 1100 watts
  • 2 Ohms - 1600 watts
Bridged Mono @ 1kHz, 1%THD
  • 8 Ohms - 2200 watts
  • 4 Ohms - 3200 watts
Input Sensitivity
  • 1.23 Vrms (+4 dBu) for full power @ 4 Ohms
Input Impedance
  • 30K ohms Balanced/15K ohms Unbalanced
Frequency Response
  • 0/-0.5dB: 20Hz - 20kHz; 0/-3dB: 5Hz - 60kHz
Signal to Noise Ratio
  • Better than 100dB (20Hz - 20kHz)
Distortion (SMPTE-IM)
  • Less than 0.03%
Output Circuitry
  • H
  • Continuously variable speed fan, front to rear
  • Short circuit, thermal, current limit, dc offset, AC current inrush,RF protection, subsonic, turn on/off muting
  • Front: Power on/off switch, volume controls for each channel
  • Rear: Mode switch (stereo / parallel / bridge), HPF on/off,
  • Limiter on/off (US3000/4000)
  • Power, parallel, bridge. Each channel: Signal, -20dB, -10dB, clip, protect
Power Requirements
  • 115/230V 60/50Hz factory configured
AC consumption
  • Both channels driven at 4 Ohm load, at 115Vac (for 230V divide by 2)
Typical level, 1/8 power pink noise
  • 9.6A
Severe level, 1/3 power pink noise
  • 19.8A
  • 19” (482mm) x 3.5” (88mm) x 17.2” (438mm)
Net weight
  • 49lb (22.3kg)