Dayton Audio SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier
Overview:
The Dayton Audio SPA300-D high-efficiency subwoofer plate amp packs big-amp features into a compact chassis that is ideal for installation into cabinets that can’t accommodate bulky old-style amps. A Class-D topology makes it small, but with the same output capability as a traditional amplifier topology. We’ve included everything that you need to connect the amp to your system and get maximum performance!
Key Features:
- 300W RMS Output @ 4 ohms
- Switchable 6 dB @ 30 Hz bass boost
- Class-D output stage for highly efficient, well defined output
- Manual and Auto on/off modes for compatibility with any automated system
- Variable gain, crossover point and switchable phase controls optimize room integration
- Switchable 120/240V input voltage
Product Details:
Brand | Dayton Audio |
Model | SPA300-D |
Unit of Measure | Each |
Weight | 3.1 |
Specifications:
Inputs | 1 |
Driver Connection | Red = 0.205″ / Black = 0.11″ |
Power Requirements | 115 – 230 VAC |
Power Consumption | 300 Watts |
Dimensions | 8-1/16″ H x 7-1/16″ W x 2-1/8″ D |
Cutout Dimensions | 7″ H x 6″ W |
Weight | 2.2 lbs |
Key Specifications:
Channels | 1 |
Power Output @ 4 ohms (RMS) | 300 Watts |
Power Output @ 4 ohms (MAX) | 600 Watts |
Frequency Response | 20Hz – 200Hz |
Inputs | 2x RCA Inputs |
Outputs | 1x Powered Output |
The plate amplifier that packs a punch!
The Dayton Audio SPA300-D high-efficiency subwoofer plate amp packs big-amp features into a compact chassis that is ideal for installation into cabinets that can’t accommodate bulky old-style amps. A Class-D topology makes it small, but with the same output capability as a traditional amplifier topology. We’ve included everything that you need to connect the amp to your system and get maximum performance!
USB Power Out
Attach a Dayton Audio WLS System to the USB output and enjoy a wireless connection from your stereo system
Variable Crossover
Maintain a smooth transition from your full-range speakers with a variable low-pass filter.
Bass Boost
Get maximum performance from smaller drivers and enclosures with a switchable 6dB boost at 30Hz.
Auto-On
When no signal is present, the SPA300-D will shut itself off until you need it most!
Class-D Excellence
The efficient class-D design keeps size and weight to a minimum while providing maximum power to your driver. SPA-D Amplifiers are perfect for subwoofer duty due to their high efficiency and low noise volume at lower frequencies making amplification selection easier than ever.

Connectivity
Front:
1. USB Power Supply – 5V 500mA USB power supply. This output will supply power when the amplifier is on or in stand-by mode.
2. Low-Level Inputs (Left/Right) – RCA Style jacks that will accept standard line level inputs from a pre-amp level source.
3. Output Lead for Subwoofer Driver – Solderless disconnect terminals for driver connection: Red = 0.205″ / Black = 0.11″
4. Power Input – This unit features an IEC Type power jack.
5. Power/Clipping LED – This LED indicator will display the current status of the amplifier.
6. Volume (Gain) – This control will match the amplifier’s input sensitivity to the output of the pre-amp source.
7. Frequency (Low-pass crossover) – This sets the highest frequency the subwoofer will reproduce and has a range between 40-200Hz with a slope of 18dB/Oct.
8. Phase – This two-position switch helps to compensate for differences between the acoustical and electrical characteristics between the subwoofer and main speakers.
9. Auto Turn On/Off – When the “auto” position is selected the amp is in standby mode until an input signal is detected.
10. Bass Boost – This allows the user to add a 6dB boost to the response centered at 30Hz.
11. Voltage Selector Switch – This switch allows the user to select 115/120VAC or 230/240VAC operation.
12. Main Power Switch – Main power disconnect.
Class-D Excellence:
The efficient class-D design keeps size and weight to a minimum while providing maximum power to your driver. SPA-D Amplifiers are perfect for subwoofer duty due to their high efficiency and low noise volume at lower frequencies making amplification selection easier than ever.
Connectivity:
1. USB Power Supply – 5V 500mA USB power supply. This output will supply power when the amplifier is on or in stand-by mode.
2. Low-Level Inputs (Left/Right) – RCA Style jacks that will accept standard line level inputs from a pre-amp level source.
3. Output Lead for Subwoofer Driver – Solderless disconnect terminals for driver connection: Red = 0.205″ / Black = 0.11″
4. Power Input – This unit features an IEC Type power jack.
5. Power/Clipping LED – This LED indicator will display the current status of the amplifier.
6. Volume (Gain) – This control will match the amplifier’s input sensitivity to the output of the pre-amp source.
7. Frequency (Low-pass crossover) – This sets the highest frequency the subwoofer will reproduce and has a range between 40-200Hz with a slope of 18dB/Oct.
8. Phase – This two-position switch helps to compensate for differences between the acoustical and electrical characteristics between the subwoofer and main speakers.
9. Auto Turn On/Off – When the “auto” position is selected the amp is in standby mode until an input signal is detected.
10. Bass Boost – This allows the user to add a 6dB boost to the response centered at 30Hz.
11. Voltage Selector Switch – This switch allows the user to select 115/120VAC or 230/240VAC operation.
12. Main Power Switch – Main power disconnect.
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