{"id":9970301567216,"title":"RetroSound® Quadraphonic 4-channel Amplifier","handle":"quadraphonic-four-channel-power-amplifier","description":"\u003cp\u003eThe RetroSound® Quadraphonic amplifier is a plug-and-play solution for adding additional power to your classic car stereo system. The Quadraphonic is a 4-channel amplifier and connects directly to your RetroSound radio delivering 45-watts RMS to all four speakers. Pair it with a RetroSound 8\" powered subwoofer for a complete audio system that's a breeze to install. The Quadraphonic amplifier offers an exceptional dynamic range and low distortion with built-in variable high-pass filters for both front and rear channels.\u003c\/p\u003e\n\u003cp\u003eListen to your favorite 60's rockabilly or 80's pop hits in your classic ride with perfect clarity and experience the music the same way you do in your daily driver. Dual gain control allows you to match the input sensitivity to the output of your RetroSound radio for the best possible audio reproduction in your classic vehicle.\u003c\/p\u003e\n\u003cp\u003eThe Quadraphonic is a Class D (digital) amplifier with advanced circuitry and thermal overload protection. The amplifier's ultra-low current draw, advanced shielding, and compact size of just 7.05” x 3” x 1.65” allows installation almost anywhere, even behind the dashboard, where most amps fail due to electrical interference! A perfect solution for classic cars where space is limited.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4-channel amplifier\u003c\/li\u003e\n\u003cli\u003eFull-range Class D digital circuitry\u003c\/li\u003e\n\u003cli\u003e45-watts RMS x 4 channels full-range @ 4 ohms\u003c\/li\u003e\n\u003cli\u003eBuilt-in variable high pass filters\u003c\/li\u003e\n\u003cli\u003eAdvanced circuitry and thermal protection\u003c\/li\u003e\n\u003cli\u003eDirectly connects to your RetroSound radio\u003c\/li\u003e\n\u003cli\u003eWorks with any aftermarket radio with low-level RCA outputs\u003c\/li\u003e\n\u003cli\u003eOptional wiring kit available for aftermarket radios\u003c\/li\u003e\n\u003cli\u003eCompact size fits almost anywhere\u003c\/li\u003e\n\u003cli\u003eDimensions: 7.05” x 3” x 1.65”(17.9 cm x 7.1 cm x 4.2 cm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003c!--SPLIT--\u003e\n\u003c!--SPLIT--\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Output\u003c\/td\u003e\n\u003ctd\u003e45 watts x 4 channels RMS @ 4 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Output\u003c\/td\u003e\n\u003ctd\u003e55 watts x 4 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Harmonic Distortion\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.2% @ 45 watts x 4 RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e28Hz-28KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal to Noise Ratio (EIA Rated)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd\u003e200mV-6.0 volts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrossover Slope\u003c\/td\u003e\n\u003ctd\u003e12dB per octave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrossover Frequency\u003c\/td\u003e\n\u003ctd\u003e100 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse\u003c\/td\u003e\n\u003ctd\u003e15 amp ATC Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (inches)\u003c\/td\u003e\n\u003ctd\u003e7.05” x 3” x 1.65”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (cm)\u003c\/td\u003e\n\u003ctd\u003e17.9 cm x 7.1 cm x 4.2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","published_at":"2026-04-04T13:59:08-07:00","created_at":"2026-04-04T13:59:08-07:00","vendor":"RetroSound","type":"Amplifiers \u0026 Subwoofers","tags":["amplifier","amplifiers","amps\u0026subs","universal 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RetroSound® Quadraphonic amplifier is a plug-and-play solution for adding additional power to your classic car stereo system. The Quadraphonic is a 4-channel amplifier and connects directly to your RetroSound radio delivering 45-watts RMS to all four speakers. Pair it with a RetroSound 8\" powered subwoofer for a complete audio system that's a breeze to install. The Quadraphonic amplifier offers an exceptional dynamic range and low distortion with built-in variable high-pass filters for both front and rear channels.\u003c\/p\u003e\n\u003cp\u003eListen to your favorite 60's rockabilly or 80's pop hits in your classic ride with perfect clarity and experience the music the same way you do in your daily driver. Dual gain control allows you to match the input sensitivity to the output of your RetroSound radio for the best possible audio reproduction in your classic vehicle.\u003c\/p\u003e\n\u003cp\u003eThe Quadraphonic is a Class D (digital) amplifier with advanced circuitry and thermal overload protection. The amplifier's ultra-low current draw, advanced shielding, and compact size of just 7.05” x 3” x 1.65” allows installation almost anywhere, even behind the dashboard, where most amps fail due to electrical interference! A perfect solution for classic cars where space is limited.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4-channel amplifier\u003c\/li\u003e\n\u003cli\u003eFull-range Class D digital circuitry\u003c\/li\u003e\n\u003cli\u003e45-watts RMS x 4 channels full-range @ 4 ohms\u003c\/li\u003e\n\u003cli\u003eBuilt-in variable high pass filters\u003c\/li\u003e\n\u003cli\u003eAdvanced circuitry and thermal protection\u003c\/li\u003e\n\u003cli\u003eDirectly connects to your RetroSound radio\u003c\/li\u003e\n\u003cli\u003eWorks with any aftermarket radio with low-level RCA outputs\u003c\/li\u003e\n\u003cli\u003eOptional wiring kit available for aftermarket radios\u003c\/li\u003e\n\u003cli\u003eCompact size fits almost anywhere\u003c\/li\u003e\n\u003cli\u003eDimensions: 7.05” x 3” x 1.65”(17.9 cm x 7.1 cm x 4.2 cm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003c!--SPLIT--\u003e\n\u003c!--SPLIT--\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Output\u003c\/td\u003e\n\u003ctd\u003e45 watts x 4 channels RMS @ 4 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Output\u003c\/td\u003e\n\u003ctd\u003e55 watts x 4 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Harmonic Distortion\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.2% @ 45 watts x 4 RMS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e28Hz-28KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal to Noise Ratio (EIA Rated)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd\u003e200mV-6.0 volts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrossover Slope\u003c\/td\u003e\n\u003ctd\u003e12dB per octave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrossover Frequency\u003c\/td\u003e\n\u003ctd\u003e100 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse\u003c\/td\u003e\n\u003ctd\u003e15 amp ATC Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (inches)\u003c\/td\u003e\n\u003ctd\u003e7.05” x 3” x 1.65”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (cm)\u003c\/td\u003e\n\u003ctd\u003e17.9 cm x 7.1 cm x 4.2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e"}