{"product_id":"mcintosh-mi254","title":"MI254 4-Channel Power Amplifier","description":"\u003cdiv class=\"mc-editorial\"\u003e\n\u003csection id=\"overview\" class=\"mc-section\"\u003e\u003cp\u003eThe MI254 4-Channel Digital Amplifier is a versatile multi-channel amplifier ideal for use in distributed audio, home theater or 2-channel stereo playback. It delivers 250 Watts into 8 Ohm speakers or 300 Watts into 4 Ohm speakers via its highly sophisticated closed loop digital switching amplifiers. These amplifiers are paired with extremely robust power supplies that produce performance levels rarely achieved in distributed audio.\u003c\/p\u003e\n\u003cp\u003eIt has installer-friendly physical dimensions and is 2U rack mountable via the included mounting ears (the mounting ears are removable for non-rack installations). As a highly efficient Class D amplifier, it does not require noisy cooling fans to maintain nominal operating temperature. In addition to distributed audio use, the MI254 is well suited for home theaters to drive surround sound speakers and could be integrated into virtually any existing home theater system.\u003c\/p\u003e\n\u003cp\u003eOn the front panel are two blue McIntosh Watt Meters that display the summed power output of channels 1 + 2 and channels 3 + 4. Multi-color LED indicators display the status of each channel. The back panel includes both a balanced and unbalanced input for each channel along with our standard 5-way speaker binding posts.\u003c\/p\u003e\n\u003cp\u003eOther features that come with the MI254 are: Power Guard® signal overload technology that prevents overdriving the speakers; our Sentry Monitor™ short-circuit protection circuit that disengages the output stage before current exceeds safe operating levels and then resets automatically when operating conditions return to normal; BUS input \u0026amp; outputs to easily distribute a stereo signal to multiple outputs and\/or multiple amplifiers; individual channel inputs; 12 Volt triggering capabilities; and eco-friendly on\/off signal sensing that turns the unit off if no input signal has been detected for a set amount of time or automatically turns the amp on when it senses a signal.\u003c\/p\u003e\n\u003cp\u003eThe MI254 includes many McIntosh design cues including a black glass front panel, blue Watt meters, an illuminated McIntosh logo, and a familiar form factor highlighted by silver trim. Contact your local dealerto learn more about integrating the MI254 into your custom audio installation.\u003c\/p\u003e\u003c\/section\u003e\n\u003cdetails id=\"specifications\" class=\"mc-accordion\"\u003e\u003csummary\u003eSpecifications\u003c\/summary\u003e\u003cdiv class=\"mc-spec-body\"\u003e\n\u003cp class=\"mc-spec-heading\"\u003eElectronic Specifications\u003c\/p\u003e\n\u003cdiv class=\"mc-spec-grid\"\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eFTC Power Output Rating\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e250 W\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003ePower Output per Channel\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e250 W into 8 ohms\u003c\/p\u003e\n\u003cp class=\"mc-spec-sub\"\u003e300 W into 4 ohms\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eNumber of Channels\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e4\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eTotal Harmonic Distortion\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e0.025%\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eS\/N below rated output\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e100dB\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eDynamic Headroom\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e8 ohms: 2.5dB\u003c\/p\u003e\n\u003cp class=\"mc-spec-sub\"\u003e4 ohms: 3.5dB\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eDamping Factor\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e8 ohms: \u0026gt;85\u003c\/p\u003e\n\u003cp class=\"mc-spec-sub\"\u003e4 ohms: \u0026gt;45\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eRated Power Band\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e20Hz to 20kHz\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eFrequency Response\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e+0, -0.9dB from 20Hz to 20kHz\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"mc-spec-heading\"\u003eControl\u003c\/p\u003e\n\u003cdiv class=\"mc-spec-grid\"\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eRemote Power Control\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eYes\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eMulti-Channel DB25 Cable\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eN\/A\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"mc-spec-heading\"\u003eConnectivity\u003c\/p\u003e\n\u003cdiv class=\"mc-spec-grid\"\u003e\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eSpeaker Binding Post Type\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eStandard\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cp class=\"mc-spec-heading\"\u003eGeneral Specifications\u003c\/p\u003e\n\u003cdiv class=\"mc-spec-grid\"\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eCircuit Configuration\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eClosed loop digital switching\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eCircuit Design\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eDigital\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eMono Bridge\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eN\/A\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eMono Parallel\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eN\/A\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eOutput Type\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eDirect Coupled\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eMeters\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eYes\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eMeter Light Switch\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eNo\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eBalanced Input\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e4\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eFront Panel\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eGlass with removable rack mounting ears\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eIllumination\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eDirect LED\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eChassis Style\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003eBlack painted steel\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eBTU Rating\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e1000 BTU\/h\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"mc-spec-heading\"\u003eWeights \u0026amp; Dimensions\u003c\/p\u003e\n\u003cdiv class=\"mc-spec-grid\"\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eUnit Dimensions (W x H x D)\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e17-1\/2\" (44.45cm) (19\" (48.3cm with mounting ears)) x 4-5\/16\" (11cm) (including feet) x 21\" (53.3cm) (including front panel and cables)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eUnit Weight\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e23.5 lbs (10.7 kg)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mc-spec-item\"\u003e\n\u003cp class=\"mc-spec-name\"\u003eShipping Weight\u003c\/p\u003e\n\u003cp class=\"mc-spec-value\"\u003e40 lbs (18.1 kg)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails id=\"downloads\" class=\"mc-accordion\"\u003e\u003csummary\u003eDownloads\u003c\/summary\u003e\u003cul class=\"mc-downloads\"\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.mcintoshlabs.com\/-\/media\/Files\/mcintoshlabs\/DocumentMaster\/us\/MI254-brochure-35108600.pdf?rev=aee616529b2a4af29460a6c5d1c1c993\u0026amp;revision=aee61652-9b2a-4af2-9460-a6c5d1c1c993\"\u003eMI254 Power Amplifier Brochure\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.mcintoshlabs.com\/-\/media\/Files\/mcintoshlabs\/DocumentMaster\/us\/mi254om-01.pdf?rev=e19192ccc08b4810a5643ff10499a9c8\u0026amp;revision=e19192cc-c08b-4810-a564-3ff10499a9c8\"\u003eMI254 Power Amplifier Owner's Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.mcintoshlabs.com\/-\/media\/Files\/mcintoshlabs\/DocumentMaster\/us\/mi254cd1and2and3-01.pdf?rev=2dfcc0fec9a0464c99c24c3ca36b8792\u0026amp;revision=2dfcc0fe-c9a0-464c-99c2-4c3ca36b8792\"\u003eMI254 Power Amplifier Connection Diagram\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n.mc-editorial{font-family:inherit;color:inherit;line-height:inherit}\n.mc-section{padding:2.5rem 0;border-top:1px solid rgba(128,128,128,.2)}\n.mc-section:first-child{border-top:none;padding-top:0}\n.mc-section h3{margin:0 0 .75rem;font-size:inherit}\n.mc-section p{margin:0 0 1rem;opacity:.8}\n.mc-section p:last-child{margin-bottom:0}\n.mc-img-block,.mc-video-block{margin:0;padding:0}\n.mc-img-block img,.mc-video-block video{width:100%;height:auto;display:block}\n.mc-video-block video{max-height:600px;object-fit:cover}\n.mc-accordion{border-top:1px solid rgba(128,128,128,.2);margin:0}\n.mc-accordion summary{cursor:pointer;padding:1.25rem 0;list-style:none;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-family:inherit;color:inherit}\n.mc-accordion summary::-webkit-details-marker{display:none}\n.mc-accordion summary::after{content:'+';font-size:1.5rem;font-weight:300;line-height:1}\n.mc-accordion[open] summary::after{content:'−'}\n.mc-spec-body{padding-bottom:1.5rem}\n.mc-spec-heading{font-size:.7em;font-weight:700;text-transform:uppercase;letter-spacing:.08em;opacity:.5;padding:.75rem 0 .25rem;margin:0}\n.mc-spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 2rem;margin:0 0 .5rem}\n.mc-spec-item{padding:.5rem 0;border-bottom:1px solid rgba(128,128,128,.15)}\n.mc-spec-name{margin:0 0 .2rem;font-size:.875em;font-weight:600;opacity:.9}\n.mc-spec-value,.mc-spec-sub{margin:0;font-size:.875em}\n.mc-spec-value{opacity:.8}\n.mc-spec-sub{opacity:.6}\n.mc-downloads{list-style:none;padding:0;margin:0 0 1.5rem}\n.mc-downloads li{padding:.5rem 0;border-bottom:1px solid rgba(128,128,128,.15)}\n.mc-downloads a{color:inherit;text-underline-offset:3px}\n@media(max-width:600px){.mc-spec-grid{grid-template-columns:1fr}}\n\u003c\/style\u003e","brand":"McIntosh","offers":[{"title":"Default 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