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Dayton Audio SPA500DSP Subwoofer Plate Amplifier
Elite Control with DSP

Dayton Audio’s SPA500DSP true 250 watt digital switching plate amplifier features advanced signal processing control that every audio enthusiast wants. With Class D output topology, the SPA500DSP delivers high-impact bass performance for thundering lows. Complete with multiple DSP functions including 7-band PEQ, LPF, phase, subsonic filter, limiter, delay, and HPF the SPA500DSP gives you the ultimate control to fine tune your audio system. This power and flexibility is accessible via PC-GUI software and our innovative single-knob LCD control panel. 

Whether building a new subwoofer, or bringing an old speaker back to life by replacing an old plate amp, the Dayton Audio SPA500DSP is an excellent option. 

Key Specs:
Power Output: 250W RMS into 4 Ω
THD+N: <0.1% Signal-to-Noise Ratio: 97.9 dB (A-Weighted) Input Sensitivity (RCA): 320mV - 1.4V Input Sensitivity (XLR): 630mV - 2.7V Power Requirements: 110-120/220-240 VAC (selectable, 50/60HZ) Dimensions: 10-1/4" H x 7-1/4" W x 2.125" D Cutout Dimensions: 9-1/4" H x 6-1/4" W We Got Your Back We stand behind our products and our warranty is a demonstration of our commitment to quality and reliability LEARN MORE ABOUT DAYTON AUDIO WARRANTY DSP Plate Amplifier Features The SAP250DSP has all of the features to give you complete control over your entire audio system from the back of the amp. The amp's single-knob control panel allows you to fine tune your DSP settings on a high-contrast LCD display. The back of the amp also allows you to attenuate your input, select power mode, and connect to your computer via USB. With a variety of inputs including XLR-1/4" TRS combo jacks and RCA, the SPA500DSP allows you to connect to virtually any source. XLR and RCA outputs allow you to pass signal to other systems or speakers, such as your mains.  The SPA500DSP also has selectable 120/220 VAC power.  The compact size and lightweight design of the SPA500DSP fit into almost any subwoofer enclosure. If you need even more mounting flexibility  while building or retrofitting an enclosure with no amp cutout, the optional mounting frame is the perfect solution.  1. Power Mode Select the either energy-saving or “always-on” power mode Auto: Amp goes into standby after no detected signal input for 20 minutes - Amp will automatically turn on typically in one second or less once audio signals are resumed. On: Amp is always on, regardless of input signal status. 2. Analog Input Attenuation Affects analog balanced and unbalanced inputs only Normal: No attenuation Hi: Attenuates input signal by -6dB   3. USB Control Used for PC-GUI communication with custom PC software included with your amp 4. Feature Control Single knob digital actuator with single/double-click enabled with rotary scrolling to navigate the amp’s extensive feature menu   5. Limiter LED Lit when Limiter is active (Red). 6. Standby/On LED Red when amp is in energy saving “stand by” state and Green when amp is operating normally Digital Signal Processing Features This unique amplifier allows you to fine tune your system's low frequency performance, and at the same time high pass to your mains (or satellites) protecting them from damage due to over excursion. Digital Signal Processing features including 7 PEQ bands, LPF, phase, subsonic filter, limiter, mains delay, and HPF are accessible via a single-knob control panel on the back of the amp or a fast, intuitive PC-based GUI software.  Note: Windows 10 and 11 User Microsoft .net Framework 3.5 is required for the SPA500-DSP software to run properly. This is not installed by default in Windows 10 or 11. DOWNLOAD DSP GUI SOFTWARE  
 
DSP Processing Block Diagram
 
Volume/Phase
 
USB Link Indicator: When the communication via USB with amp is successful, the GUI’s LED indicator will light green. Otherwise, LED stays red
Processing Selection: Navigate across the DSP menu to adjust various DSP parameters
Sub In/Out Monitor: Monitor the input signal and sub output signal levels.
Tools Drop Down Menu: Utilities for amp DSP management
Volume: Adjust the level (gain) of the subwoofer output
Phase: Continuously adjustable phase from 0° to 180°
 
Low Pass & Subsonic Filters
Low Pass Filter
Subsonic Filter
Filter ON/OFF Button: Enable or disable the selected filter.
Slope: Select roll-off gradient of the selected filter: -12dB/-24dB per octave.
Frequency (Hz): Adjust cut-off frequency of the selected filter
 
5-Band Parametric Equalization

 

PEQ Window: Graphical trace is NRT editable. Bands can be shaped by cursor or direct input and/or sliders

5 Band-digital PEQ Adjustments:

a. Band On/Off: Bypass or enable by clicking the colorized 1~5 buttons

b. Center Frequency (CF): Adjust Center Frequency of each EQ band, 10~200Hz, steps: 1Hz.

c. Gain: Adjust the EQ gain (apparent volume), -12 ~ +6dB, steps: 0.1dB

d. Q (EQ width): Adjust the “Q” value, 0.4~16 , step: 0.1

 
Dual-Band Limiter
 

Dual-Band Limiter Adjustments:

a. Threshold: Adjust the limiter threshold, 0~-12dB, step: 0.1dB

 b. Attack: Adjust limiter’s “attack time”. This controls the time taken to attenuate signals over the threshold to the specified threshold level. Range: 1/5/10/20/100ms 

c. Release: Adjust limiter’s “release time”. When signal is below threshold level, this controls the time taken to restore back to original level. Range: 60/120/240/480/1000/2000ms

 d.  Frequency: The crossover frequency point between the 2 bands: Band 1 (Low Frequency) & Band 2 (High Frequency).

 
High Frequency Out
 

This block controls the DSP parameters for line level output only.

Delay: Adjust the time difference between High Frequency out and Subwoofer out.

HPF Adjustments:

Filter ON/OFF: Bypass or Enable the selected filter

Slope: Select roll-off gradient of the selected filter: -12dB/-24dB per octave 

Frequency: Adjust cut-off frequency of the selected filter

 

 

No Hassle Mounting

The compact size and lightweight design of the SPA500DSP fit into almost any subwoofer enclosure. If you need even more mounting flexibility  while building or retrofitting an enclosure with no amp cutout, the optional mounting frame is the perfect solution. 

The Dayton Audio SPA-F mounting frame makes it easy to add an SPA500DSP or SPA500DSP subwoofer amplifier to any existing subwoofer without cutting a hole in the enclosure. Constructed from rigid 16 gauge steel the SPA-F includes vents at the top and bottom allowing ample airflow to promote thermal convection to keep the amplifier cool – hot air escapes out the vents in the top, which pulls cool air in the bottom. Foam gaskets on all contact surfaces ensure no vibration or rattles once installed. With the SPA-F adding an amplifier to a subwoofer is easier than ever, all you need is a screwdriver.

LEARN MORE ABOUT SPA-F MOUNT
Product Details

Brand Dayton Audio
Model SPA500DSP
Part Number 300-8012
UPC 848791004711
Unit of Measure Each
Weight 4.3