{"product_id":"boulder-861-stereo-power-amplifier","title":"Boulder 861 Stereo Power Amplifier","description":"\u003cp\u003eThe Boulder 861 Stereo Power Amplifier distills the company’s decades of high-power, high-precision engineering into a compact, accessible form. Sharing the exact footprint of the 812 DAC Preamplifier, it delivers 50W continuous into 8 ohms with the current reserves to double peak power into 4 ohms and reach 200W peaks into 2-ohm loads, ensuring authoritative control across a wide range of loudspeakers. New protection circuitry allows the amplifier to deliver greater current at maximum output without risking damage to its electronics, preserving composure during demanding passages.\u003c\/p\u003e\u003cp\u003eEvery circuit board and piece of metalwork is produced in-house at Boulder’s dedicated facility, a level of vertical integration that supports rigorous quality assurance. The fully balanced design, with a 3-pin XLR input, achieves a frequency response of +0.00, -0.04 dB from 20 Hz to 20 kHz and a noise floor of just 2.6 μV, contributing to a notably transparent window into the recording. Boulder’s traditional 0.25-inch thumbscrew binding posts secure speaker cables with the firm contact essential for signal integrity, while IP control and networked HTML page access simplify integration into modern systems. Software updates for the internal control and housekeeping systems are available via automated online downloads or manual USB port installation, keeping the amplifier current with minimal effort.\u003c\/p\u003e\n\u003ctable class=\"pu-table\" style=\"width:100%;border-collapse:separate;border-spacing:0;border:0;box-shadow:none;outline:none;background:none;table-layout:fixed;margin:0\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"border:0;padding:0\"\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003e\n\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"18\" height=\"18\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"display:inline-block;width:1.1em;height:1.1em;vertical-align:-0.18em;margin-right:0.45em\" aria-hidden=\"true\"\u003e\u003cpath d=\"M16 18a2 2 0 0 1 2 2a2 2 0 0 1 2 -2a2 2 0 0 1 -2 -2a2 2 0 0 1 -2 2zm0 -12a2 2 0 0 1 2 2a2 2 0 0 1 2 -2a2 2 0 0 1 -2 -2a2 2 0 0 1 -2 2zm-7 12a6 6 0 0 1 6 -6a6 6 0 0 1 -6 -6a6 6 0 0 1 -6 6a6 6 0 0 1 6 6z\"\u003e\u003c\/path\u003e\u003c\/svg\u003eHighlights\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding-left:0;margin:0 0 1em\"\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ 75W peak power per channel into 8 ohms, 110W peak power into 4 ohms, 200W peak power into 2 ohms\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ New protection circuitry enables the 861 to deliver greater current at maximum output without damage to the amplifier's electronics\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Space saving design with the same footprint (width and depth) as the 812 DAC Preamplifier\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Smaller carton packaging for easier transportation, unpacking, and installation\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Circuit boards and metalwork are produced in-house for quality assurance\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ 0.25\" (6 mm) thumbscrew binding posts included for secure speaker cable connections\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ IP control, and networked HTML page\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e✓ Software updates to the internal control and housekeeping systems available via automated online downloads or manual USB port installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ctable class=\"pu-table\" style=\"width:100%;border-collapse:separate;border-spacing:0;border:0;box-shadow:none;outline:none;background:none;table-layout:fixed;margin:0\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"border:0;padding:0\"\u003e\n\u003ch3 style=\"margin:1.25em 0 0.5em\"\u003e\n\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"18\" height=\"18\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" style=\"display:inline-block;width:1.1em;height:1.1em;vertical-align:-0.18em;margin-right:0.45em\" aria-hidden=\"true\"\u003e\u003cpath d=\"M4 17v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2 -2v-2\"\u003e\u003c\/path\u003e\u003cpath d=\"M7 11l5 5l5 -5\"\u003e\u003c\/path\u003e\u003cpath d=\"M12 4l0 12\"\u003e\u003c\/path\u003e\u003c\/svg\u003eDownloads\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e\u003ca href=\"https:\/\/boulderamp.com\/wp-content\/uploads\/861-Owners-Manual-V1-1.pdf\" target=\"_blank\" rel=\"noopener nofollow\"\u003e861 Owners Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e\u003ca href=\"https:\/\/boulderamp.com\/wp-content\/uploads\/861-Stereo-Amplifier-DIMS.pdf\" target=\"_blank\" rel=\"noopener nofollow\"\u003e861 Dimensions\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin:0 0 0.35em\"\u003e\u003ca href=\"https:\/\/boulderamp.com\/wp-content\/uploads\/861-Literature-Final-1.pdf\" target=\"_blank\" rel=\"noopener nofollow\"\u003e861 Literature\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Boulder Amplifiers","offers":[{"title":"Default Title","offer_id":43181651099746,"sku":null,"price":9450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2475\/2780\/files\/boulder-861-stereo-power-amplifier-1.png?v=1786008785","url":"https:\/\/pearlaudio.com\/products\/boulder-861-stereo-power-amplifier","provider":"Pearl Audio","version":"1.0","type":"link"}