{"product_id":"quad-405-power-amplifiers-good-w-original-box","title":"Quad 405 - Power Amplifiers - Good w\/ Original Box","description":"\u003ch1\u003eQuad 405 - Power Amplifiers - Good w\/ Original Box\u003c\/h1\u003e\n\n\u003ch2\u003eWhy This One\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eGood condition — clearly used but works as it should\u003c\/li\u003e\n  \u003cli\u003eFully tested — all applicable functions verified working\u003c\/li\u003e\n  \u003cli\u003ePatented current-dumping circuit delivers 100W per channel with under 0.01% THD.\u003c\/li\u003e\n  \u003cli\u003eComes in its original box — a rare find for a classic amplifier of this age.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCondition: Good\u003c\/h2\u003e\n\n\u003cp\u003eThis Quad 405 is a good-condition power amplifier. It has passed our 8-point functional test, with 2 item(s) not applicable to this unit. Please review all photos carefully, as they provide an accurate representation of the cosmetic condition of the product.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eQuad 405\u003c\/li\u003e\n  \u003cli\u003eOriginal Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout This Model\u003c\/h2\u003e\n\u003cp\u003eThe Quad 405 is a stereo power amplifier built around Quad's patented current-dumping topology — an elegant circuit combining a low-powered Class A stage that maintains continuous speaker control with a high-powered section that cuts in only when high-amplitude signals demand it. The result is 100 watts per channel into 8-ohm loads with vanishingly low distortion: less than 0.01% THD at 1 kHz and less than 0.05% at 10 kHz, alongside a signal-to-noise ratio of 95 dB. Frequency response is flat across the audible range, rolling off only at the extremes. The amplifier is unconditionally stable with speaker loads between 4 Ω and 16 Ω and requires no internal adjustments. An internal power limiter can reduce output to 50 watts for use with lower-power speakers, including Quad's own electrostatic models. Connections are via a 4-pin DIN input and spring-loaded speaker terminals.\u003c\/p\u003e\n\n\u003cp\u003eA great opportunity to own a Quad 405 at this price point.\u003c\/p\u003e","brand":"Quad","offers":[{"title":"Default Title","offer_id":53963109433681,"sku":null,"price":225.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0775\/6913\/0833\/files\/002c2e36-c9dc-4b07-a085-f593dddb886c.jpg?v=1780666589","url":"https:\/\/www.audiotrader.co.uk\/products\/quad-405-power-amplifiers-good-w-original-box","provider":"Audio Trader","version":"1.0","type":"link"}