OSD Audio - SMP500 DSP Mono Class D Subwoofer Amplifier, 800W Peak at 4 Ohms, 1U Rack Mountable - Black
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About this product
The SMP500DSP is a Class D mono subwoofer amplifier built for higher-wattage passive subwoofers such as in-wall models that require external power. It delivers 400W RMS and 800W peak at 4 ohms, or 250W RMS and 500W peak at 8 ohms, in a rack-mountable 1U chassis. A front-panel variable high-cut filter adjusts from 30Hz to 150Hz, routing higher frequencies to the main speakers so the subwoofer concentrates on low-frequency content. Additional front-panel controls cover phase and volume, and the amplifier includes an adjustable gain and volume limiter to protect woofers from overdrive. Turn-on options include music sensing, manual on or 12V trigger. Input choices cover signal-level and speaker-level connections plus LFE, with speaker pass-through outputs for older and newer systems alike. Frequency response spans 10Hz to 150Hz with a 95dB signal-to-noise ratio and air cooling. The power supply is switchable between 115V and 230V. ETL and CE rated with a 2-year warranty.
800W Peak, 400W RMS at 4 Ohms
A switch-mode power supply feeds Class D amplification rated at 400W RMS and 800W peak into 4 ohms, or 250W RMS and 500W peak into 8 ohms. This is enough authority for large in-wall subwoofers and demanding home theater rooms where smaller sub amps run out of headroom during action sequences.
Variable High-Cut Filter, 30Hz to 150Hz
A front-panel variable high-cut filter routes higher frequencies to the main speakers so the subwoofer handles only the low-frequency content it reproduces best. Crossover adjustment spans 40Hz to 160Hz with phase control across 0 to 315 degrees for precise alignment in difficult rooms.
Gain Limiter Protects Your Woofers
An adjustable gain and volume control limiter caps output before the subwoofer is driven past its mechanical limits. Combined with a front-mounted power meter showing real-time output, this gives a clear picture of how hard the system is working and reduces the risk of damaging expensive in-wall drivers.
Three Turn-On Modes and Flexible Inputs
Choose music sensing, manual on or 12V trigger to match the installation. Signal-level and speaker-level inputs plus an LFE option cover modern and legacy sources, and speaker pass-through outputs simplify wiring in systems where the amplifier sits between the receiver and main speakers.
1U Rack Chassis with Remote Control
At 17.13 by 9.45 by 1.75 inches and 7.6 pounds, the amplifier takes a single rack space with mounts included. Remote control, auto-on sensing and 12V triggers are all supported. Air cooled with a switchable AC 115/230V supply. 10Hz to 150Hz response, 95dB signal-to-noise. ETL and CE rated, 2-year warranty.
- Continuous Watts x Channel @ Ohms400W x 1 @ 4 Ohms; 250W x 1 @ 8 OhmsNumber of Channels1Number of Audio Zones1Network Connector(s)No network connectors
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