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Optimus Prime's Stereo Equipment Old School Audio - Old School Prices - Professionally Tested Product Description Up for sale is a Sony STR-K660P 5.1 channel home theater receiver, fully tested and confirmed working. All channels deliver clean audio output, and the AM/FM tuner locks onto stations without issue. Unit is in good cosmetic condition with minor wear consistent with normal use. Remote not included. Please review all photos for details. Highlights At A Glance ✔ Fully tested and verified ✔ Good cosmetic condition with minor wear from use ✔ Free 30-day returns ✔ Fast, insured shipping Testing & Verification All 5.1 channels were driven and verified for clean, distortion-free output. The AM/FM tuner was tested across the dial and confirmed to receive stations properly. All inputs, speaker outputs, tone and balance controls, and surround sound modes were exercised and functioning as intended. Shipping & Returns Fast, insured shipping from Minnesota. Free 30-day returns. Item is carefully packaged for safe delivery.
Notable mostly for being cheap enough to merit a closer look. At US$70, this sits well below the US$80 25th percentile from your recent comps, so it reads as a strong bargain versus the typical used market, with the US$120 median and US$209 75th percentile leaving solid room above it.
For a Sony 5.1-channel home theater package, the appeal is usually straightforward: easy surround-sound upgrade, decent mainstream reliability, and enough output to make a TV room feel complete without spending much. At this price, the upside is in getting a full system for less than the usual entry point; just make sure the listing includes the core pieces you need and that all speakers, the sub, and any control unit or remote are present, since missing parts can erase the value fast.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Sony emerged from the ruins of post-World War II Japan, founded on May 7, 1946, by Masaru Ibuka and Akio Morita as Tokyo Tsushin Kogyo K.K. in Tokyo's Nihonbashi district. Starting with radio repairs and Japan's first magnetic tape recorder, the duo secured transistor licensing from Bell Labs, pioneering the TR-55 transistor radio in 1955. Renamed Sony Corporation in 1958—from the Latin "sonus" for sound—the brand symbolized Japan's ascent from cheap imitations to innovative leadership, fueled by Ibuka's engineering prowess and Morita's global marketing vision.
Sony's hi-fi legacy spans headphones, amplifiers, speakers, turntables, and DACs, alongside landmark formats like the Compact Disc in 1982 and Blu-ray. Iconic products include the Walkman for portable audio revolution and Trinitron televisions, blending consumer accessibility with cutting-edge tech. Today, offerings like the Signature Series headphones and ES amplifiers target discerning listeners seeking refined soundstaging and dynamic range.
Positioned as a mid-to-high-end powerhouse, Sony commands respect among knowledgeable buyers for blending mass-market reliability with premium performance, outpacing many pure audiophile brands in innovation and value. Far from vintage relic or niche boutique, it dominates with forward-thinking engineering, holding strong market share in headphones and streaming ecosystems.
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