| US Series Professional Power Amplifiers are loaded with features
• Compact size - up to 3200 watts in 2 rack spaces
• 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 1/4" 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 cooling design keep amplifiers cool
Model US-4000
Rated Output Power << Stereo Both Channel Driven >>
8 Ohms 700 watts
4 Ohms 1100 watts
2 Ohms 1600 watts
Rated Output Power << Bridged Mono >>
8 Ohms 2200 watts
4 Ohms 3200 watts
Input Sensitivity 1.23 (+4 dBu) for full power @ 4 Ohms
Input Impedance 30 kohms Balanced/15 kohms Unbalanced
Input CMRR (1 kHz) Better than 60dB
Frequency Response 0/-0.5dB: 20Hz - 20kHz <> 0/-3dB: 5Hz - 60kHz
Signal to Noise Ratio
(20Hz - 20kHz) Better than 100dB
Distortion (SMPTE-IM) Less than 0.03%
Damping Factor More than 300 at 8 Ohms Below 1k Hz
Output Circuitry H
Cooling Continuosly variable speed fan, Front to rear
Protection Short Circuit, Thermal, Current Limit, DC Offset, Current Inrush,
RF Protection, Turn On/Off Muting
Connectors for each channel Input: Combo Female XLR & 1/4" phone jack
Link: Male XLR
Output: Both 5-Way Biding Post and Speakon
Controls Front: Power On/Off Switch, Volume Controls for Each Channel
Rear: Mode Switch (stereo / parallel / bridge), HPF On/Off, Limiter On / Off (US3000/4000)
Indicator Power, Parallel Mono, Bridge. Each Channel: Signal, -20dB, -10dB, Clip, Protect
Power Requirements 120Vac (USA) / 240Vac (Europe)
Dimensions (W x H x D)
19" (482mm) x 3.5" (88mm) x 17.2" (438mm)
Net Weight 48.9lb (22kg)
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