OSD SMP300 300W Class-D High-Current Mono Subwoofer Amplifier
The OSD Audio SMP300 300W Class-D High-Current Mono Subwoofer Amplifier provides commanding low-frequency dynamics and precision acoustic tuning for high-performance passive in-wall, in-ceiling, and landscape subwoofers. Generating 300 watts RMS into 4 ohms (150 watts RMS into 8 ohms), the SMP300 features front-panel volume, variable low-pass crossover (30Hz to 150Hz), continuously adjustable phase (0 to 180 degrees), selectable subsonic filter, LFE input, and 12V trigger automation.
If you want to know what high-current subwoofer amplifier delivers deep, distortion-free 300W bass for demanding architectural home theaters, how a front-panel variable phase dial eliminates acoustic room cancellations without opening equipment racks, or how a selectable subsonic filter protects drivers from over-excursion, the OSD SMP300 provides the premier solution. Home cinema designers choose the SMP300 for its robust headroom and tactile front-panel acoustic calibration.
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Commanding 300W High-Current Class-D Output
Engineered with a high-current digital power supply and heavy-duty output stage, the SMP300 effortlessly drives dual 4-ohm passive subwoofers or heavy-excursion 10-inch and 12-inch architectural drivers with deep, room-shaking authority.
Front-Panel Acoustic Calibration Controls
Convenient front-panel dials allow instant adjustment of master subwoofer volume, low-pass crossover frequency (30Hz to 150Hz), and a continuously variable phase dial (0 to 180 degrees) for precise room acoustic tuning.
Selectable Subsonic Filter & Bass Boost
Includes a switchable subsonic filter (off, 20Hz, 40Hz) to prevent driver damage from ultra-low infrasonic frequencies and optimize port tuning, plus an optional bass boost toggle to enhance punch in larger cinema rooms.
Comprehensive LFE & Automation Connectivity
Features dedicated LFE and stereo RCA line-level inputs with buffered loop outputs, 12V trigger input and output for synchronized automation power-up, and signal-sensing Auto-On circuitry for hands-free operation.
Specifications
| Amplifier Type | High-Current Class-D Mono Subwoofer Power Amplifier |
| Power Output (4 Ohms) | 300 Watts RMS (Continuous Low-Frequency Power) |
| Power Output (8 Ohms) | 150 Watts RMS (Continuous Low-Frequency Power) |
| Frequency Response | 20Hz - 160Hz (+/- 1dB) |
| Variable Low-Pass Crossover | 30Hz - 150Hz (24dB/Octave Continuously Variable) |
| Variable Phase Control | 0 Degrees - 180 Degrees Continuously Adjustable Dial |
| Subsonic Filter | Selectable Off / 20Hz / 40Hz (12dB/Octave) |
| Signal-to-Noise Ratio | >95dB A-Weighted |
| Total Harmonic Distortion | <0.05% at Rated Output |
| Inputs | Dedicated LFE In, Stereo RCA Line In, High-Level Speaker Binding Posts |
| Outputs | RCA Line Pass-Through, High-Current 5-Way Subwoofer Binding Posts |
| Trigger Control | 12V DC Trigger Input & Output (3.5mm Minijack) |
| Rack Mounting | Includes Heavy-Duty 19-Inch 1U Rack Mount Ears |
| Dimensions (W x D x H) | 17.0 x 10.5 x 1.8 Inches (432 x 267 x 45 mm) |
| Unit Weight | 10.0 lbs (4.5 kg) |
In The Box Contents
- 1x OSD SMP300 300W Class-D Mono Subwoofer Amplifier
- 1x Pair 19-Inch Heavy-Duty 1U Rack Mount Ears with Mounting Screws
- 1x Heavy-Duty Grounded AC Power Cord
- 1x Comprehensive User Manual and System Setup Guide
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