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The Marantz MA-500 is a high-quality power amplifier designed and manufactured in Japan. As part of the renowned Marantz brand, this amplifier is known for its superior sound quality and performance. With its sleek design and reliable operation, the Marantz MA-500 is a popular choice for audiophiles looking to enhance their home audio experience with a top-of-the-line amplifier.8 Ohm Output: 125 Watts RMS (0.05% THD)4 Ohm Output: 180 Watts RMS (0.09% THD)Bridged Output: 450 Watts into 8 ohmsFrequency Response: -10 to 100 kHz (-1 dB at 1 Watt)Signal to Noise Ratio: >116 dB (A-weighted)Damping Factor: 200 (at 8 ohms)Input Sensitivity: 1 V RMS / 30 kohms [1, 2]Physical and ElectricalPower Requirements: 120 V AC, 60 Hz (200 Watts consumption)Design: Slim, narrow chassis built for multi-channel rackSelling my Marantz monoblocks. These are 1 owner amps in mint condition and just Serviced. They produce a staggering amount of super clean power with an unbelievable signal to noise ratio of 116dB. They have that warm classic Marantz sound They are so famous for. I am thinning out my collection a little. I hate to see them go. You would be hard pressed to find a nicer pair. I ship to the lower 48 only.
The timing is fine here: this is an older power amp, so the key question is condition and whether it has been refreshed, not whether a newer replacement has made it obsolete. At US$399, it lands right at the 75th percentile of your recent comps and well above the US$202 median, so this is ambitious rather than a bargain.
What keeps it interesting is the Marantz house sound and the fact that a clean, working monoblock-style power amp like this can still be a very practical way to add muscle to a system without spending much more. If it’s truly well cared for, the upside is simplicity and strong resale appeal; just make sure the seller can speak to service history, because age-related caps and channel-matching issues matter more here than cosmetics.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
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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