Amplifiers
Our model 8400 and 255R amplifiers are designed to work in concert with our full-range speakers and subwoofers to provide the optimum power and signal processing to bring laboratory-grade invisible sound to your project.
When you connect a Stealth invisible speaker to a Stealth 8400 multi-channel amplifier, you gain access to Stealth’s powerful DSP-based internal equalizer algorithms, derived in our own test facilities. These “Optimization” curves use pre-determined signal processing to bring out the best of each Stealth LinearResponse® series speaker. Want an LR3 to sound just like we can make it sound in the lab using all of our expensive processing gear? Then simply assign LR3 optimization to the 8400 amplifier channel feeding the speaker. You can do this with LR6’s and LR8’s as all the processing power is already built into the 8400 amplifier to easily turn our award-winning invisible speakers into an unbelievable sounding speaker system.
Amplifier Specifications
| 255R | 8400 | |
|---|---|---|
| Type | Subwoofer Amplifier | 8-Channel Amplifier with DSP optimization |
| Mono Power Output | 250 watts @ 8 < 0.05 THD 350 watts @ 4 < 0.05 THD |
80 watts @ 8 < 0.05 THD 160 watts @ 4 < 0.05 THD (bridged) |
| Total Harmonic Distortion | < 0.05 @ 1 watt 4 / 100Hz | <0.05 @ 1 watt 4 / 100Hz |
| Signal to Noise Ratio | 86 dB below rated output | 86 dB below rated output |
| Low Pass Filter | 50Hz - 150Hz / 18 dB per octave (variable with bypass switch) | Pre-defined EQ curves for Stealth Acoustics LineaResponse® speakers |
| High Pass Filter | 18Hz / 30 dB per octave (fixed) | |
| System Impedance | 8Ω nominal, 4Ω minimum | 8Ω nominal, 4Ω minimum |
| Current Draw | 6.2A @ 350W/4 - 115VAC/60Hz | 12A @ full draw – 115-230 VAC/50-60Hz |
| Width | 19” (482 mm) with ears | 19” (482 mm) with ears |
| Height | 3-1/2” (89 mm) without feet | 3-1/2” (89 mm) without feet |
| Depth | 13-5/8” (345 mm) without knobs | 13-5/8” (345 mm) without knobs |
| Weight | 30 lbs. (13.6 kg) | 20 lbs. (9.1 kg) |