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The unknown condition note on this ADC SS-2 Sound Shaper Two MK II makes the US$225 asking price ambitious, sitting well above the typical used market where similar units frequently appear for US$99.99 to US$100. Even accounting for the rare US$225 listing for an SS-2-1C model, that price likely reflects a verified, pristine original-owner example rather than an unknown-condition item. Without confirmation of functionality or cosmetic state, this listing exceeds the 75th percentile for the market, making it a risky bet compared to the US$100 bargain zone.
That said, the ADC SS-2 is a well-regarded 12-band graphic equalizer known for meeting stringent THD specs better than 0.015% and maintaining tight channel accuracy across its 30Hz to 16kHz control frequencies. If this unit turns out to be fully functional with original knobs and no noisy switches, it offers genuine vintage tone-shaping capability that still holds value for analog enthusiasts. However, given the price gap and unknown condition, a buyer should only proceed if they can verify the unit works before paying, or wait for a clearer listing closer to the US$100–US$125 fair range.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
ADC most likely refers to Audio Dynamics Corporation, a U.S. hi-fi brand founded by Peter Pritchard in the early 1960s in New Milford, Connecticut. It should not be confused with ADC Telecommunications, which was a separate communications company. The audio brand’s heritage is firmly rooted in the classic American cartridge era, and it later passed into other ownership before disappearing as an independent maker.
ADC was best known for magnetic phono cartridges, especially high-performance models aimed at vinyl playback. Its identity was tied to turntable-era analog audio rather than a broad component catalog, and there is no strong evidence that it became a major player in amplifiers, speakers, DACs, or headphones.
In market terms, ADC sits today as a vintage-collector and analog-audio specialist brand rather than a current mainstream hi-fi label. Among knowledgeable buyers, it is remembered for inventive cartridge design and respectable sonic performance, with interest driven more by restored legacy products and archival reputation than by an active modern product line.
See all ADC listings on RADAR.
