SPA500 500W Subwoofer Plate Amplifier

High power Class AB output stage for clean, controlled o

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

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 today's demanding HT audio and music playback applications.

Cutout dimensions: 10" W x 10" H.


• 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

Model Number SPA500
Color Black
Unit of Measure Each
UPC 844632015922
Warranty - Parts 5 Years
Warranty - Labor 5 Years
Product Height 11-15/16"
Product Width 11-15/16"
Product Length --
Product Depth 5-1/4"
Product Shipping Weight (lbs.) 20.0000
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 Wires
Output Types 4 ohms, 8 ohms
Inputs 2
Input Connectors RCA
Input Impedance 12K ohms
Signal-to-Noise Ratio 98 dB A-weighted
THD @ Rated Power 0.92%
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 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

SKU 844632015922
Model # SPA500
Barcode # 844632015922
Brand Dayton Audio
Shipping Weight 8.5000kg
Shipping Width 0.337m
Shipping Height 0.216m
Shipping Length 0.343m
Shipping Cubic 0.024916000m3
Assembled Length 0.343m
Assembled Height 0.216m
Assembled Width 0.337m

Plate Amplifier

By: on 4 November 2014
Sensational speed, clarity musical and real grunt with movies. The dual purpose is a real bonus and my sub now intergrates with my Magneplanar's like never before.

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