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Provides 5V 500mA output for powering wireless audio receivers or other accessories.
RCA jacks accepting line level inputs from a pre-amp source, internally combined to mono.
Connects the amplifier to the subwoofer driver using color-coded wires with disconnects.
IEC power jack allowing cord changes for voltage and houses the AC line fuse.
Indicates amplifier status: blue for on, red for standby, flashing red for clipping onset.
Adjusts amplifier's input sensitivity to match the pre-amp source for optimal balance.
Sets the highest frequency for subwoofer reproduction (40-200 Hz) with an 18 dB/octave slope.
A 0° or 180° switch to help compensate for acoustical and electrical differences with main speakers.
Amplifier turns on with signal and returns to standby after 15-18 minutes of no input.
Provides a switchable 6 dB boost centered at 30 Hz to enhance low-end response.
Allows selection between 115/120VAC and 230/240VAC operation, requires fuse change.
Primary power disconnect for the amplifier, turns it completely off.
The Dayton Audio SPA300-D is a 300-watt Class-D subwoofer plate amplifier designed for high-quality sound reproduction in both home stereo and home theater systems. Its efficient Class-D design minimizes size and weight while providing robust performance.
The SPA300-D serves as the power source and control center for a subwoofer driver. It accepts low-level audio inputs from a pre-amp or receiver, processes them, and delivers amplified output to a subwoofer driver. The amplifier is designed to integrate seamlessly into existing audio setups, offering features that allow users to fine-tune the subwoofer's performance to match their main speakers and room acoustics.
A key function of this amplifier is its ability to combine stereo input signals into a mono signal, which is standard for subwoofer operation. It features a variable low-pass crossover, allowing users to set the highest frequency the subwoofer will reproduce, ensuring a smooth transition between the subwoofer and main speakers. This crossover can be adjusted from 40 Hz to 200 Hz with an 18 dB per octave slope. For systems using a pre-amp or home theater receiver with a dedicated LFE (Low Frequency Effects) output, the internal low-pass filter can be bypassed by setting the frequency control to maximum (200 Hz), allowing the external device to manage the crossover.
The amplifier also includes a phase switch, offering 0° or 180° settings. This feature is crucial for compensating for acoustical and electrical differences between the subwoofer and main speakers, helping to prevent destructive phase interferences and improve overall system integration. Experimenting with this switch, along with subwoofer placement, can significantly impact sound quality.
For enhanced bass performance, the SPA300-D incorporates a switchable bass boost, providing a 6 dB boost centered at 30 Hz. This feature is particularly useful for extending the low-end response of designs with decreased output below 40 Hz, such as sealed enclosures or low-tuned vented/passive radiator designs. Users are advised to use caution with this feature, especially with drivers that have limited excursion or enclosures tuned higher than 30 Hz, to avoid exceeding the driver's limits.
The amplifier is equipped with an auto on/off circuit, which conserves power by placing the unit in standby mode when no input signal is detected. The amplifier automatically turns on when an input signal of approximately 10 millivolts or greater is detected and returns to standby mode 15-18 minutes after the signal stops. Users can also choose to keep the amplifier always on or always in standby, regardless of signal presence, using the "Auto Turn On/Off" switch.
A convenient 5V 500mA USB power supply output is provided, which remains active when the amplifier is on or in standby. This output is ideal for powering wireless audio receivers, facilitating the creation of a wireless subwoofer system.
The SPA300-D offers several user-adjustable controls and indicators for optimal setup and performance:
The SPA300-D is designed for reliable operation with minimal user maintenance, but certain precautions and features are in place for safety and longevity:
The SPA300-D is built to provide years of high-quality sound, backed by its robust design and protective features, ensuring a durable and enjoyable audio experience.
General| Power Output | 300 Watts |
|---|---|
| Frequency Response | 20 Hz - 200 Hz |
| Input Impedance | 10 kOhms |
| THD+N | < 0.1% |
| Amplifier Type | Class D |
| Damping Factor | > 200 |
| THD | < 0.1% |
| Bass Boost | 0 - 12 dB |
| Phase Adjustment | 0 / 180 degrees |
| Power Requirements | 120V AC, 60Hz |
| Power Output @ 4 ohms | 300 Watts |
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