Stealth Acoustics Monaural Subwoofer Amplifier SA255
Monaural Subwoofer Amplifier
The Stealth Acoustics SA255 is an integrated monaural subwoofer amplifier/crossover system designed as a low distortion power source for Stealth Acoustics invisible subwoofer panels or other un-powered subwoofers. The SA255 can also be used for full range speakers when the low pass filter is off. Intended for whole house audio or home theatre bass applications, the SA255 may stack with other components or mount in a standard 19” equipment rack requiring two RU spaces (3-1/2”) with the provided removable rack mount ears. The SA255 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 SA255 is easily integrated into any audio system. Inputs include RCA line level, balanced XLR line level, and phoenix connector speaker level, all with pass-through capability. The speaker level input/pass-through connections allow the SA255 to feed directly from full-range speaker lines, anywhere in the system. The SA255’s amplifier output connection is via a 5-way binding post designed to accept heavy gauge 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, phase control, power switch and six power output monitor LED’s. Rear power controls consist of filter bypass switch for full range operation, no signal mute switch and 3-position panel graphics control switch. 115VAC and 230VAC input line voltages are selectable, via a rear panel switch.
The Stealth Acoustics SA255 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
Low Pass Filter: 50Hz – 150Hz / 18 dB per octave
(variable with bypass switch)
High Pass Filter: 18Hz / 30 dB per octave (fixed)
8Ω nominal – 4Ω minimum
6.2A @ 350W/4 – 115VAC/60Hz
Width: 19” (482 mm)
Height: 3-1/2” (89 mm) – without feet
Depth: 13-5/8” (346 mm)
Product Weight: 31.3 Lbs. (14.20 kg)
Shipping Weight: 32.5 Lbs. (14.74 kg)
Removable power card
Removable rack ears