SPA500 500W Subwoofer Plate Amplifier

Quick Overview

The Dayton Audio SPA500 Subwoofer Amplifier delivers the efficiency of a Class D design without compromising audio quality and reliability.

Product Highlights

  • High power Class AB output stage for clean, controlled output
  • Patented tracking downconverter power supply for high efficiency
  • Toroidal power supply transformer
  • Low frequency parametric EQ allows you to boost or cut to custom-tailor sound
  • Advanced soft clip circuitry improves headroom and protects woofers
  • OTC TM (Optimized Thermal Circuit) protects amplifier from potential heat damage
  • Hercules heat sinks dissipate and control heat for extreme reliability

Product Manuals / Spec Sheets / Downloads

Dayton Audio SPA500 User Manual

Buying Options

One of the most technologically advanced subwoofer amplifiers on the market today! The Dayton Audio SPA500 subwoofer amplifier is based on a state-of-the-art Class G circuit topology that combines the proven high power, high fidelity characteristics of a Class AB amplifier with a patented tracking down converter power supply to achieve an operating efficiency up to 86%. You get the efficiency of a Class D amplifier without compromising audio quality and reliability. The Class AB output stage provides the clean and low-distortion sound that audiophiles demand, without any of the instability problems that plague other high-efficiency amplifier designs.

This American-designed and engineered amplifier uses patented circuitry that continuously tracks the input signal to modulate or control the voltage available to the output stage. This "tracking" capability delivers the exact amount of power based on demand instead of constantly keeping it in reserve, so the output stage only draws the amount of power that is required at any given time. Less energy is wasted as heat, and more power is available for the subwoofer driver. With its enhanced thermal management, the SPA500 is an upgrade over previous models—making it a nearly bulletproof amplifier choice for todays demanding HT audio and music playback applications.

Cutout dimensions: 10" W x 10" H.

Model Number SPA500
Color Black
Unit of Measure Each
UPC 844632015922
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Shipping Weight (lbs.) 20
Product Height 11-15/16"
Product Width 11-15/16"
Product Length --
Product Depth 5-1/4"
Amplifier Type Subwoofer Plate Amplifiers
Power Output

273 Watts* into 8 ohms

540 Watts* into 4 ohms

Power Output (RMS @ 70V) Range --
Output Channels 1
Output Connectors 476
Output Types 285286
Inputs 2
Input Connectors 299
Input Impedance 12K ohms
Signal-to-Noise Ratio 98 dB A-weighted
THD @ Rated Power 0.0092
Parametric EQ Frequency: 18 Hz – 80 Hz
Bandwidth: 0.1 – 1 Q
Level: -14.5dB – +6dB
Phase Adjustment 0° (NOR) or 180° (REV)
Low-pass Crossover --
Low Pass Adjustment 30 Hz – 200 Hz
Dynamic Range --
Frequency Response 30 Hz – 200 Hz
Efficiency 0.75
Gain --
Bass Boost --
Voltage Requirement

115/230 VAC

50 Hz/60 Hz

Auto-on Sensitivity --
Stand-by Power Rating 115V 24W; 230V 18.4W
Special Features Parametric EQ
Patented tracking downconverter
Advanced soft clip circuitry
Class AB output stage
Variable low pass filter