The 1-channel amplifier SPA250DSP from Dayton Audio offers a variety of features that enhance your audio experience. With its flexible control, it allows you to choose between an energy-saving mode and an "Always On" mode. The analog input attenuation provides adjustment options for balanced and unbalanced inputs. The USB control allows for easy PC GUI communication, while a convenient one-button function control makes navigating an extensive menu manageable. With a built-in 5-band parametric equalizer, dual limiter functions, and high-frequency output, the amplifier offers extensive adjustment options for sound optimization. Additionally, it achieves an output power of 250 watts RMS at 4 ohms with a low THD+N value of less than 0.1%.

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: Serves for PC GUI communication with the custom PC software included with your amplifier.
  
• Function control: Digital single-button actuator 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.

Control of the subwoofer via the PC user interface

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 filter

• 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 trace is NRT-editable. Bands can be shaped using the cursor or direct input and/or sliders.
  
• 5-Band-Digital-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 size: 0.1
  

Dual-Band Limiter

• Threshold: Sets the limiter threshold, 0~-12 dB, step size: 0.1 dB
  
• Attack: Sets the "attack time" of the limiter. This controls the time required to process signals above the
  
• Threshold 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 transition frequency point between the 2 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: 250 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