The latest additions to the industry-proven US-Series are two professional 2U heavy-duty power amplifiers for the most challenging applications. The US-4000 are built on a rugged, heavy gauge 2U steel chassis with a sturdy aluminum front panel. The amplifiers use advanced circuitry and a well-designed PCB layout to ensure quality sound and enhanced reliability. Large dual aluminum heatsinks and an oversized toroidal transformer, combined with comprehensive protection circuitry and dual large variable speed fans provide worry-free and reliable operation in the most demanding environments.

Download Instruction Manual - 4MB

Product Specs

Model US-1200 US-1800 US-3000 US-4000

<< Stereo Both Channel Driven @ 1kHz, 1%THD >>

8 Ohms 210 watts 300 watts 500 watts 700 watts

4 Ohms 330 watts 475 watts 800 watts 1100 watts

2 Ohms 430 watts 700 watts 1200 watts 1600 watts

<< Bridged Mono @ 1kHz, 1%THD >>

8 Ohms 650 watts 950 watts 1600 watts 2200 watts

4 Ohms 850 watts 1400 watts 2400 watts 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 AB AB H H

Cooling Continuously variable speed fan, front to rear

Protection Short circuit, thermal, current limit, dc offset, AC current inrush,

RF protection, subsonic, turn on/off muting

Connectors Input: Combo female XLR & 1/4” TRS 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, 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)

Controls Front: Power on/off switch, volume controls for each channel

Typical level, 1/8 4.5A 6.3A 7A 9.6A

power pink noise

Severe level, 1/3 7A 9.6A 14.8A 19.8A

power pink noise

Dimensions 19” (482mm) x 3.5” (88mm) x 17.2” (438mm)

Net weight 28lb (13kg) 35lb (16kg) 43lb (19kg) 49lb (22.3kg)

Product Features

• Up to 3200 watts in densely packed 2U enclosure
• Rugged heavy gauge steel enclosure with sturdy aluminum front panel for stability and increased longevity
• High-current toroidal transformers for increased 2-ohm power output
• 21-position gain control knobs for consistent settings
• Selectable STEREO, PARALLEL MONO and BRIDGED MONO modes for flexibility
• 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
• Balanced combo XLR and 1/4" TRS input connectors and link XLR output connectors
• Both binding posts and SpeakonTM output connectors
• Low-noise cooling fans with continuous variable speed and highly efficient front-to-rear forced air cooling design
• Clip limiters reduce distortion without sacrificing peak performance (defeatable on US-3000/US-4000)
• Washable open cell foam air filters
• Blue LED strips on front panel
• Soft start circuit to reduce in-rush AC current