Dayton Audio SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier

Price: 21,500.00INR
Ex Tax: 21,500.00INR
Brand:  Dayton Audio
Product Code:  SPA300-D
Availability:  In Stock
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Dayton Audio SPA300-D 300 Watt Class-D Subwoofer Plate Amplifier


Quick 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.


Product Highlights:

  • 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
  • With a Dayton Audio 5 year warranty, it’s more than a guarantee, it’s a promise. We stand behind our products and our warranty is a demonstration of our commitment to quality and reliability.


Product Description:


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.

Insides of the SPA300-D





SPA300-D Callouts




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 - This rear mounted output lead connects the amplifier to the subwoofer driver

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.





Power Handling (RMS)

300 Watts

Power Handling (MAX)

600 Watts

Frequency Response

20 - 200Hz

Input Sensitivity

200 mV

SNR, A-Weighted

101 dB

Total Harmonic Distortion




Power Requirements

115 - 230 VAC

Power Consumption

300 Watts


8-1/16" H x 7-1/16" W x 2-1/8" D

Cutout Dimensions

7" H x 6" W


2.2 lbs



We pride ourselves on being an authority in the speaker building and DIY community. With over 60 years of combined engineering experience, our team of engineers is here to help with your build. Below are some useful tools to get you started.




Dayton Audio



Part Number




Unit of Measure





Product Manuals / Spec Sheets / Downloads

Dayton Audio SPA300-D User Manual
Dayton Audio SPA300-D GUI Software

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