{"title":"Equalizers","description":"Vintage graphic equalizers from Yamaha and Sansui — serviced, cleaned and bench-tested, with working spectrum displays and a 30-day warranty.","products":[{"product_id":"yamaha-eq-550","title":"Yamaha EQ-550","description":"\u003cp\u003eYamaha EQ-550 Graphic Equalizer — Fully Serviced, Cleaned \u0026amp; Tested | Black Panel Era\u003c\/p\u003e\u003cp\u003eAdd precision tone-shaping and that unmistakable Yamaha spectrum analyzer glow to your system with this fully serviced EQ-550 graphic equalizer — a black-panel-era classic built for the golden age of Japanese hi-fi.\u003c\/p\u003e\u003cp\u003eService \u0026amp; Condition\u003cbr\u003eThis unit has gone through Black Panel Audio's full functionality and cosmetic protocol before listing:\u003c\/p\u003e\u003cp\u003e• Full exterior and internal chassis cleaning\u003cbr\u003e• Caustic glue residue removed and inspected\u003cbr\u003e• Pots, faders and switches cleaned, lubricated, and treated with DeoxIT\u003cbr\u003e• Slide faders exercised and verified smooth end-to-end\u003cbr\u003e• Spectrum analyzer display tested across all bands\u003cbr\u003e• All inputs\/outputs and tape monitor loops verified functional\u003cbr\u003e• Bench-tested for signal integrity and channel balance\u003c\/p\u003e\u003cp\u003eWhy Black Panel Audio\u003cbr\u003eWe specialize exclusively in curated 1980s–90s black-panel Yamaha gear — no mixed-era junk drawer, just era-correct pieces that were built to last and deserve a second life. Every unit we sell is inspected, tested, and cleaned by hand, and backed by our 30-Day Warranty so you can buy with confidence.\u003c\/p\u003e\u003cp\u003eWhat's Included\u003c\/p\u003e\u003cp\u003e• Yamaha EQ-550 Graphic Equalizer\u003cbr\u003e• Power cable\u003cbr\u003e• 30-day warranty from Black Panel Audio\u003c\/p\u003e\u003cp\u003eNotes\u003cbr\u003eCosmetic wear consistent with age — see photos for exact condition. Reach out with any questions before bidding\/buying. Follow us for videos @blackpanelaudio\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/EQ-550-manual.pdf?v=1792219302\" target=\"_blank\" rel=\"noopener\"\u003eOwner's Manual (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":43821504921661,"sku":"Z035222QS","price":595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/browser-download-20261008T141534.403559760Z-8.jpg?v=1792035715"},{"product_id":"sansui-rg-710-stereo-graphic-equalizer","title":"Sansui RG-710 Stereo Graphic Equalizer","description":"\u003cp\u003eThis puts on a pretty decent light show everyone wants from their vintage equalizer. Sliders have been cleaned and lubricated\u003c\/p\u003e\u003cp\u003eThe Sansui RG-710 Vintage Analog Stereo Graphic Equalizer is a classic piece of audio equipment from the 1980s. This equalizer, in sleek black, offers stereo L\/R RCA input and output options, perfect for connecting to your home audio system. With its analog design and tested functionality, this Sansui RG-710 unit delivers clean sound and allows for precise audio adjustments. Whether you're looking to enhance your music listening experience or add a vintage touch to your home audio setup, this equalizer is a reliable choice.\u003c\/p\u003e","brand":"Sansui","offers":[{"title":"Default Title","offer_id":43821506822205,"sku":"474051057","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/browser-download-20261008T010523.238641448Z-1.jpg?v=1792036519"},{"product_id":"yamaha-eq-550-natural-sound-graphic-equalizer","title":"Yamaha EQ-550 Natural Sound Graphic Equalizer","description":"\u003cp\u003eYamaha EQ-550 Graphic Equalizer — Fully Serviced, Cleaned \u0026amp; Tested | Black Panel Era\u003c\/p\u003e\u003cp\u003eAdd precision tone-shaping and that unmistakable Yamaha spectrum analyzer glow to your system with this fully serviced EQ-550 graphic equalizer — a black-panel-era classic built for the golden age of Japanese hi-fi.\u003c\/p\u003e\u003cp\u003eService \u0026amp; Condition\u003cbr\u003eThis unit has gone through Black Panel Audio's full functionality and cosmetic protocol before listing:\u003c\/p\u003e\u003cp\u003e• Full exterior and internal chassis cleaning\u003cbr\u003e• Caustic glue residue removed and inspected\u003cbr\u003e• Pots, faders and switches cleaned, lubricated, and treated with DeoxIT\u003cbr\u003e• Slide faders exercised and verified smooth end-to-end\u003cbr\u003e• Spectrum analyzer display tested across all bands\u003cbr\u003e• All inputs\/outputs and tape monitor loops verified functional\u003cbr\u003e• Bench-tested for signal integrity and channel balance\u003c\/p\u003e\u003cp\u003eWhy Black Panel Audio\u003cbr\u003eWe specialize exclusively in curated 1980s–90s black-panel Yamaha gear — no mixed-era junk drawer, just era-correct pieces that were built to last and deserve a second life. Every unit we sell is inspected, tested, and cleaned by hand, and backed by our 30-Day Warranty so you can buy with confidence.\u003c\/p\u003e\u003cp\u003eWhat's Included\u003c\/p\u003e\u003cp\u003e• Yamaha EQ-550 Graphic Equalizer\u003cbr\u003e• Power cable\u003cbr\u003e• 30-day warranty from Black Panel Audio\u003c\/p\u003e\u003cp\u003eNotes\u003cbr\u003eCosmetic wear consistent with age — see photos for exact condition. Reach out with any questions before bidding\/buying. Follow us for videos @blackpanelaudio\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/EQ-550-manual.pdf?v=1792219302\" target=\"_blank\" rel=\"noopener\"\u003eOwner's Manual (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":43821508526141,"sku":"Z3048670Q","price":605.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/browser-download-20261008T111539.443277239Z-0.jpg?v=1792036802"},{"product_id":"yamaha-eq-550-line-out-fault","title":"Yamaha EQ-550 (Line Out Fault)","description":"\u003cp\u003e\u003cstrong\u003ePLEASE NOTE — LINE OUT FAULT:\u003c\/strong\u003e This unit’s Line Out RCA output has an internal fault and carries no signal. The Tape Output works perfectly — please connect this unit via the Tape Output. Priced and listed accordingly; full details in the Known Issue section below.\u003c\/p\u003e\u003cp\u003eYamaha EQ-550 Graphic Equalizer — Fully Serviced, Cleaned \u0026amp; Tested | Black Panel Era\u003c\/p\u003e\u003cp\u003eAdd precision tone-shaping and that unmistakable Yamaha spectrum analyzer glow to your system with this fully serviced EQ-550 graphic equalizer — a black-panel-era classic built for the golden age of Japanese hi-fi.\u003c\/p\u003e\u003cp\u003eService \u0026amp; Condition\u003cbr\u003eThis unit has gone through Black Panel Audio's full functionality and cosmetic protocol before listing:\u003cbr\u003e• Full exterior and internal chassis cleaning\u003cbr\u003e• Caustic glue residue removed and inspected\u003cbr\u003e• Pots and switches cleaned, lubricated, and treated with DeoxIT\u003cbr\u003e• Slide faders exercised and verified smooth end-to-end\u003cbr\u003e• Spectrum analyzer display tested across all bands\u003c\/p\u003e\u003cp\u003eKnown Issue\u003cbr\u003eThe Line Out RCA output has an internal fault resulting in no signal\/sound through that connection. The Tape Output works perfectly, and all other functions — inputs, EQ bands, spectrum analyzer, switching — are fully operational. Priced and listed accordingly; please use the Tape Output for connection to your system.\u003c\/p\u003e\u003cp\u003eWhy Black Panel Audio\u003cbr\u003eWe specialize exclusively in curated 1980s–90s black-panel Yamaha gear — no mixed-era junk drawer, just era-correct pieces that were built to last and deserve a second life. Every unit we sell is inspected, tested, and cleaned by hand, and backed by our 30-Day Warranty so you can buy with confidence.\u003c\/p\u003e\u003cp\u003eWhat's Included\u003c\/p\u003e\u003cp\u003e• Yamaha EQ-550 Graphic Equalizer\u003cbr\u003e• Power cable\u003cbr\u003e• 30-day warranty from Black Panel Audio\u003c\/p\u003e\u003cp\u003eNotes\u003cbr\u003eSee scratch\/dent to upper right corner of faceplate. Cosmetic wear consistent with age — see photos for exact condition. Reach out with any questions before bidding\/buying.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/EQ-550-manual.pdf?v=1792219302\" target=\"_blank\" rel=\"noopener\"\u003eOwner's Manual (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":43821508591677,"sku":"Z045642SU","price":345.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/files\/browser-download-20261008T111650.662069810Z-1.jpg?v=1792036851"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/1360\/6461\/collections\/browser-download-20261008T111539.443277239Z-0.jpg?v=1792165830","url":"https:\/\/blackpanelaudio.com\/collections\/equalizers.oembed","provider":"Black Panel Audio","version":"1.0","type":"link"}