Dayton Audio SPA250DSP

Description

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

Features

Power mode Select either energy-saving mode or "Always on" mode

• Auto: The amplifier switches to standby mode if no signal input is detected for 20 minutes*
  
• On: Amplifier is always switched on, regardless of the status of the input signal.
  
• The amplifier usually switches on automatically within a second or less as soon as audio signals are received again.
  

Analog input attenuation Only affects 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 supplied with your amplifier.
  
• Function control: Digital one-button actuator with single/double-click function and scroll wheel for navigating through the amplifier's extensive function menu.
  
• Limiter 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 up green when the amplifier is working normally.

Controlling the subwoofer via the PC user interface

Volume/Phase

• USB connection indicator: If communication via USB with the amplifier is successful, the LED indicator 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-out signal.
  
• Tools" drop-down menu: Utilities for the DSP management of the amplifier.
  
• Volume: Adjusts the level (amplification) of the subwoofer output.
  
• Phase: Infinitely 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): Adjusts the cut-off frequency of the selected filter
  

5-band parametric equalizer

• PEQ window: Graphic track is NRT-editable. Bands can be shaped by 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): Adjusts the center 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): Adjusts the "Q" value, 0.4~16, increment: 0.1
  

Dual-band limiter

• Threshold value: Sets the limiter threshold value, 0~-12 dB, increment: 0.1 dB
  
• Attack: Sets the "attack time" of the limiter. This controls the time it takes for signals above the
  
• threshold value can be attenuated to the specified threshold value. Range: 1/5/10/20/100 ms
  
• Release: Sets the "release time" of the limiter. If the signal is below the threshold value, 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
  
• Volume 2 (high frequency).
  

High frequency output

• This block controls the DSP parameters for the line level output only.
  
• 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: Adjusts the cut-off frequency of the selected filter.
  

Technical data

• Ausgangsleistung: 250 Watt RMS an 4 Ohm, THD+N <0,1 % 
• Signal-to-noise ratio: 97.9 dB (A-weighted) 
• Power supply: 110~120/220~240 VAC selectable, 50/60 Hz