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MARANTZ Adaptor Quadradrial 4 Amplifier 100% OriginalTested and fully working. Excellent used conditionalways kept indoors there are no lines or scratches on the front perfect working order. See pictures carefully for condition. Dimensions: 482 x 127 x 356. mm Weight: 11kg - Year of manufacture: 1975 - 1978The YouTube video was filmed with another Marantz receiver in quad mode with 4 sets of speakers (2 front, 2 rear). Please review.DescriptionThe Marantz model 2440 quadradial adaptor amplifier converts any stereo system with tape source monitor feature to a full featured 4-channel system.The 2440 incorporates Marantz's exclusive vari-matrix circuit which simulates 4-channel sound from normal 2-channel stereo programs, and is capable of reproducing 4-channel sound from any matrix encoded source.It will also reproduce any discrete 4-channel program as well as regular stereo and monaural programs.SpecificationsPower output: 20W/ch into 8Ω (stereo)Frequency response: 5Hz to 45kHzTotal harmonic distortion: 0.3%Damping factor: 45Input sensitivity: 150mV (line)Signal to noise ratio: 80dB (line)Channel separation: 30dB (line)Output: 1V (Pre out)Dimensions: 17-1/3 x 5-1/3 x 14-3/8 inchesWeight: 24.2lbs
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Marantz originated in the United States, founded in 1953 by Saul Bernard Marantz, a music enthusiast and amateur musician born in Brooklyn in 1911. Dissatisfied with the audio equipment of the era, he crafted the groundbreaking Audio Consolette preamplifier in 1952 from his New York home, selling the first 100 units rapidly and prompting the formal establishment of the company in Woodside, Queens. Though production later shifted to Japan in partnership with manufacturers like Standard Radio in 1966, and the brand evolved through ownership changes including Superscope and eventual integration into larger groups, its heritage remains rooted in American ingenuity and a relentless pursuit of musical fidelity.
The brand excels in high-end audio components, particularly amplifiers, preamplifiers, and integrated systems that defined its golden era. Iconic models like the Model 7 preamplifier (1958), Model 9 power amplifier (1960), and Model 10B tuner (1964) set benchmarks for performance, while later offerings expanded to tuners, receivers, and CD players. Marantz briefly ventured into speakers under designer Ed May in the 1970s but focused primarily on electronics rather than turntables, headphones, DACs, or cables, emphasizing separates renowned for their "Most Musical Sound."
Marantz commands a premium position in the hi-fi market, revered as a high-end pioneer that shaped the audiophile landscape through the 1970s zenith. Today, it blends vintage allure with modern elegance, appealing to discerning buyers who value durability, innovation, and warm, detailed sound signatures over mass-market accessibility.
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