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|
|FEATURES AND FUNCTIONS|
|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 Voltages||110v and 220v|