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RetroSound Quad 4 Ultra-compact Power Amplifier

RetroSound Quad 4 Ultra-compact Power Amplifier

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Part #: 58-90572-1
1932 thru 1979
See applications below for exact details.


  • 45 watts x 4 channels continuous power output
  • Full-range Class D technology
  • Ultra-low current draw
  • Advanced protection circuitry
  • Built-in variable high pass/full range crossover
  • Direct connection compatibility with all RetroSound® radios
  • Compact size (7 1/4 x 3 x 1 3/4 inches) to fit virtually anywhere
The RetroSound® Quad 4 is a full-range Class D (digital) power amplifier that plugs directly into any RetroSound® radio. Featuring 45 watts x 4 RMS power, the Quad 4 offers exceptional dynamic range and low distortion for the best possible sound reproduction from your RetroSound® audio system. Low level RCA inputs also allow the Quad 4 to be used with any aftermarket car stereo system. The Quad 4 has a built-in high pass/full range crossover, and its diminutive size means you can install it virtually anywhere, including behind the dash.