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 8Ω load and 350 watts into 4Ω. 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 5-Year manufacturer's warranty.
| Specification Sheet | Download PDF |
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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” or “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
110v and 220v Input Voltages
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
8 nominal - 4 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
Product Weight
31.3 Lbs. (14.20 kg)
Shipping Weight
32.5 Lbs. (14.74 kg)
Included Accessories
Removable power cord
Removable rack ears