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SPEC CORPORATION REAL-SOUND PROCESSOR RSP-901EX Tuning Accessories I bought these boxes in the current condition six years ago. I changed my set up and they went in to storage and forgot about them... they don't suit my current set up. The Botton lids were missing, I improvised cork lids to protect the components. Shipping is not included in price. Price reflects cosmetic condition. Link to review: https://highfidelity.pl/@main-582&lang=en Condition: Fair Payment Method: cash/bank transfer Region/State: (NSW) New South Wales/Australia By alejomach 0 Comments Secure Ad AUD $500 Date: Octobe
This A$500 ask for the SPEC RSP-901EX is a strong deal, sitting well below the typical used market for this Japanese loudspeaker filter. The unit launched at roughly €1,010 per pair (about A$1,700 at current rates), and even rare second-hand listings like the RSP-AZ9EX hover near €650 (A$1,100); at A$500, you are paying less than half the original pair price for a single, highly sought-after processor.
The RSP-901EX is well-regarded for smoothing speaker impedance fluctuations and absorbing counter-electromotive current, delivering a cleaner, more stable soundstage without altering tonality. Its tiny form factor (100×47×117 mm) and lightweight design make it easy to integrate, and it’s a rare find outside Japan. At this price, even with unknown condition, the upside is substantial: it’s a genuine buying opportunity for enthusiasts seeking SPEC’s signature “Real-Sound” refinement.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
SPEC is a Japanese hi-fi brand founded in 2010 by former TEAC and Pioneer engineer Shirokazu Yazaki, whose work was driven by a clear aim: to recreate the immediacy and tonal density of valve amplification using modern solid-state design. That origin gives the company a distinctly engineer-led, specialist identity rather than a mass-market one.
The brand is best known for integrated amplifiers and digital disc players, especially SACD players, with its “Real Sound” class D approach at the center of its product philosophy. SPEC also emphasizes proprietary parts choices and circuit tuning, which is part of its appeal to listeners who value voicing and musical presentation over spec-sheet minimalism.
In the market, SPEC sits in the niche high-end category: boutique, technically distinctive, and aimed at committed audiophiles rather than mainstream buyers. Its reputation is strongest among enthusiasts who are curious about unconventional class D implementations with a tube-like character; it is less of a broad-line brand than a specialist one.
See all SPEC listings on RADAR.
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