The SPA500DSP from Dayton Audio is a 1-channel amplifier that offers versatile power options. You can choose between an energy-saving mode and an "always-on" mode, allowing the amplifier to flexibly respond to your needs. With an output power of 500 watts RMS at 4 ohms and a signal-to-noise ratio of 97.9 dB, it delivers clear and powerful sound results. The analog input attenuation allows for precise adjustment of the input signal, while the USB control supports seamless communication with the PC software. Additionally, you can navigate through an extensive function menu and conveniently use the digital control with a one-button operator. The amplifier is also equipped with a 5-band parametric equalizer and a dual-band limiter, enabling individual sound customization.

features 

• Performance mode: Choose either the energy-saving mode or the "Always On" mode.
  
  • Auto: The amplifier switches to standby mode if no signal input is detected for 20 minutes*
    
  • An amplifier is always on, regardless of the status of the input signal.
    
  • The amplifier usually turns on automatically within one second or less as soon as audio signals are received again.
    
• Analog input attenuation: Applies only to analog balanced and unbalanced inputs.
  
  • Normal: No damping.
    
  • Hi: Attenuates the input signal by -6 dB.
    
• USB Control: Used for PC GUI communication with the custom PC software included with your amplifier.
  
• Function control: Digital one-button operator with single/double-click function and scroll wheel for navigating through the extensive function menu of the amplifier.
  
• Limit LED: Lights up when the limiter is active (red).
  
• Standby/On-LED:
  
  • Lights up red when the amplifier is in energy-saving "standby" mode.
    
  • Lights green when the amplifier is functioning normally.

Volume/Phase

• USB Connection Indicator: When the communication via USB with the amplifier is successful, the LED display on the user interface lights up green. Otherwise, the LED lights up red.
  
• Processing selection: Navigate through the DSP menu to adjust various DSP parameters.
  
• Sub-In/Out-Monitor: Monitors the levels of the input signal and the sub output signal.
  
• Dropdown menu "Tools": Utilities for the DSP management of the amplifier.
  
• Volume: Adjust the level (gain) of the subwoofer output.
  
• Phase: Continuously adjustable phase from 0° to 180°.

Low-pass and subsonic filters

• Filter ON/OFF button: Activates or deactivates the selected filter.
  
• Slope: Selects the roll-off gradient of the selected filter: -12 dB/-24 dB per octave.
  
• Frequency (Hz): Adjust the cutoff frequency of the selected filter.

5-Band Parametric Equalizer

• PEQ Window: Graphic track can be edited with NRT. Bands can be adjusted with the cursor or by direct input and/or
  
• 5 digital 5-band PEQ settings:
  
  • Band On/Off: Bypass or activate by clicking on the colored buttons 1~5
    
  • Center Frequency (CF): Controls the mid frequency of each EQ band, 10~200 Hz, steps: 1 Hz.
    
  • Gain: Controls the EQ gain (apparent volume), -12 ~ +6 dB, steps: 0.1 dB
    
  • Q (EQ-width): Sets the "Q" value, 0.4~16, step: 0.1

Dual-Band-Limiter

• Threshold: Sets the threshold of the limiter, 0~-12dB, step: 0.1dB
  
• Attack: Sets the "attack time" of the limiter. This controls the time required to process signals above the
  
• Threshold should be dampened to the specified threshold. Range: 1/5/10/20/100 ms
  
• Release: Sets the "release time" of the limiter. When the signal falls below the threshold, this controls the
  
• Time required to restore the original level. Range: 60/120/240/480/1000/2000 ms
  
• Frequency: The frequency transition point between the two bands: Band 1 (low frequency) and
  
• Band 2 (High Frequency).

high-frequency output

• This block controls the DSP parameters only for the line level output.
  
• Delay: Sets the time difference between the high-frequency output and the subwoofer output.
  
• HPF Control:
  
  • Filter ON/OFF: Bypasses or activates the selected filter.
    
  • Slope: Selects the roll-off gradient of the selected filter: -12 dB/-24 dB per octave.
    
  • Frequency: Adjust the cutoff frequency of the selected filter.

Technical Data

• Output power: 500 Watts RMS at 4 Ohms, THD+N <0.1 % 
• Signal-to-noise ratio: 97.9 dB (A-weighted) 
• Power supply: 110~120/220~240 VAC selectable, 50/60 Hz 
• Dimensions of the amplifier: 260mm H x 184mm W x 54mm D
• Cutout for amplifier: 235mm H x 158mm W