Stealth Acoustics Monaural Subwoofer Amplifier 255R
Model #:255R
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255R Monaural Subwoofer Amplifier

The Stealth Acoustics 255R is an integrated monaural subwoofer amplifier / crossover system designed as a low distortion power source for Stealth Acoustics wall or ceiling mounted, invisible subwoofer panels or other un-powered subwoofer speakers. Intended for whole house audio or home theater bass applications, the 255R may stack with other components or mount in a standard 19” equipment rack requiring only two RU spaces (3-1/2”). Removable rack mount ears are provided. The 255R delivers a solid 250 watts into an 8? load and 350 watts into 4?. A variable low pass, 18db per octave filter allows for infinite crossover points from 50Hz to 100Hz.

With a full complement of input and output connectors, the 255R is easily integrated into any audio system. Inputs include RCA line level, balanced XLR line level, and 5-way binding post speaker level, all with pass-through capability. The speaker level input/pass-through connections allow the 255R to feed directly from full-range speaker lines, anywhere in the system. The 255R’s amplifier output connection is via a 5-way binding post designed to accept heavy guage speaker wires. A selectable automatic turn-on feature activates the amplifier only when audio signals are present.

Other features include an internal, quiet, 8-stage cooling fan that automatically engages as required. Front panel controls include volume control, variable low pass filter, low pass filter on/off switch, phase control, power switch and six power output monitor LED’s. 110VAC and 220VAC input line voltages are selectable, via a rear panel switch.

The Stealth Acoustics 255R subwoofer amplifier is covered by a 2-Year manufacturer’s warranty.

Mono Power Output 250 watts @ 8 < 0.05 THD 350 watts @ 4 < 0.05 THD
Total Harmonic Distortion <0.05 @ 1 watt 4 / 100Hz
Signal to Noise Ratio 86 dB below rated output
Crossover Section Low Pass Filter: 50Hz – 150Hz / 18 dB per octave (variable with bypass switch) High Pass Filter: 18Hz / 30 dB per octave (fixed)
System Impedance 8Ω nominal – 4Ω minimum
Current Draw 6.2A @ 350W/4 – 115VAC/60Hz
Dimensions Width: 19” (482 mm) Height: 3-1/2” (89 mm) – without feet Depth: 13-5/8” (346 mm)
Finish Black anodized aluminum
Weight Product Weight: 31.3 Lbs. (14.20 kg) Shipping Weight: 32.5 Lbs. (14.74 kg)
Included Accessories Removable power cord Removable rack ears
Rack Mountable (2) RU spaces: 3-1/2” (89 mm) (*Provided rack ears are removed)
DC Protected Fixed high pass filter @ 18Hz
Variable Low Pass Filter 50 to 150Hz / 18 dB per octave
Power Standby LED Red (blue when system is active)
Auto On/Standby Function Switch selectable on/off
Flexible Inputs with Pass Through Binding post speaker level inputs / outputs RCA line level inputs / outputs XLR balanced line inputs / outputs
Amplifier Output Connector 5-way binding post
Output monitor LED’s 6 level readings
Phase Switch Low Pass Filter on/off Switch
Fan Cooled Automatic – 8 speed stages
Input Voltages110v and 220v

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