{"product_id":"mcintosh-mi128-8-channel-amplifier","title":"McIntosh MI128 8-Channel Digital Power Amplifier","description":"\u003ch2\u003eMcIntosh MI128 8-Channel Digital Power Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMcIntosh MI128\u003c\/strong\u003e is a compact, high-performance \u003cstrong\u003e8-channel amplifier\u003c\/strong\u003e designed for distributed audio, multi-zone music systems, home theater expansion and flexible stereo installations. Its closed-loop Class D amplification delivers \u003cstrong\u003e120 watts per channel into 8 ohms\u003c\/strong\u003e or \u003cstrong\u003e150 watts per channel into 4 ohms\u003c\/strong\u003e, giving custom-installed systems substantial output from a fanless 2U chassis.\u003c\/p\u003e\n\u003cp\u003eWith eight independently controlled channels, bussable analog and digital inputs, channel summing and installer-friendly Phoenix speaker terminals, the MI128 can power multiple rooms, additional home-theater channels or several stereo speaker pairs from one amplifier.\u003c\/p\u003e\n\u003ch3\u003eEight Channels for Multi-Zone and Home Theater Systems\u003c\/h3\u003e\n\u003cp\u003eThe MI128 is particularly well suited to whole-home and distributed audio. Eight amplifier channels can support up to four stereo zones when configured as stereo pairs, while channel summing makes it easy to distribute mono audio where stereo playback is unnecessary. Individual channel inputs and volume controls allow each output to be balanced for the connected room and loudspeaker.\u003c\/p\u003e\n\u003cp\u003eIt can also serve as a home-theater expansion amplifier for surround, height or additional zone speakers. Pair it with the \u003ca href=\"\/products\/mx200-a-v-processor\"\u003eMcIntosh MX200 A\/V Processor\u003c\/a\u003e when more channels are needed, or use it alongside the \u003ca href=\"\/products\/mc257-7-channel-solid-state-amplifier\"\u003eMcIntosh MC257 7-Channel Amplifier\u003c\/a\u003e to add power for secondary surround and overhead channels.\u003c\/p\u003e\n\u003ch3\u003e120 Watts per Channel into 8 Ohms\u003c\/h3\u003e\n\u003cp\u003eEach of the MI128’s eight channels produces 120 watts into an 8-ohm loudspeaker or 150 watts into a 4-ohm loudspeaker. The direct-coupled output stage and robust power supplies are engineered to maintain consistent performance across all channels while preserving the compact dimensions needed for equipment-rack installation.\u003c\/p\u003e\n\u003ch3\u003eEfficient Closed-Loop Class D Design\u003c\/h3\u003e\n\u003cp\u003eThe MI128 uses sophisticated closed-loop digital switching amplification. Its efficient Class D architecture produces less heat than a conventional multi-channel amplifier and does not require cooling fans, helping it remain quiet in listening rooms, media closets and centralized equipment racks.\u003c\/p\u003e\n\u003ch3\u003eBussable Analog and Digital Inputs\u003c\/h3\u003e\n\u003cp\u003eEach channel has an individual unbalanced RCA input, while BUS inputs and outputs make it possible to distribute a stereo signal across multiple channel pairs or additional amplifiers. Two digital audio inputs accept either coaxial or optical connections and can also be assigned through the amplifier’s bussing system.\u003c\/p\u003e\n\u003cp\u003eRear-panel switches provide local or BUS input selection and stereo or mono operation for each channel pair. Separate level controls allow installers to balance the output of individual channels without adding external attenuators.\u003c\/p\u003e\n\u003ch3\u003eInstaller-Friendly Connections\u003c\/h3\u003e\n\u003cp\u003eThe rear panel uses compact 2-pole Phoenix-style push-in speaker terminals, conserving space while providing secure connections for all eight channels. Twelve-volt triggering integrates the MI128 with compatible control systems and McIntosh components, while automatic signal sensing can turn the amplifier on when audio is detected and place it into standby after a period without a signal.\u003c\/p\u003e\n\u003ch3\u003eMcIntosh Speaker Protection\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Guard®:\u003c\/strong\u003e Monitors the audio signal and helps prevent harsh clipping that could damage connected loudspeakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSentry Monitor™:\u003c\/strong\u003e Protects the output stage from short circuits and unsafe current levels, then automatically resets when normal conditions return.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-color channel indicators:\u003c\/strong\u003e Eight front-panel LEDs show each channel’s operating and protection status.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompact 2U Rack-Mount Chassis\u003c\/h3\u003e\n\u003cp\u003eThe MI128 is only 2U high and includes removable rack-mounting ears. It can be installed in a standard 19-inch equipment rack or used as a conventional component with the ears removed. The black glass front panel, illuminated McIntosh logo and silver trim maintain the company’s signature appearance even in its streamlined custom-install format.\u003c\/p\u003e\n\u003ch3\u003eMI128 vs. a Traditional Home Theater Amplifier\u003c\/h3\u003e\n\u003cp\u003eThe MI128 prioritizes channel count, flexible signal distribution and rack efficiency. It is an excellent choice for distributed audio, Atmos height channels and secondary home-theater speakers. For the main channels of a demanding theater, a higher-powered amplifier such as the MC257 may provide greater output and traditional speaker connections. Many systems use the two types together: a larger amplifier for the front and primary surround channels, and the MI128 for additional channels or music zones.\u003c\/p\u003e\n\u003cp\u003eThe \u003ca href=\"\/products\/mht300-home-theater-receiver\"\u003eMcIntosh MHT300 Home Theater Receiver\u003c\/a\u003e can also be expanded with external amplification when a system requires additional channels beyond its internal amplifier section.\u003c\/p\u003e\n\u003ch3\u003eMcIntosh MI128 Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier Type\u003c\/th\u003e\n\u003ctd\u003e8-channel digital Class D power amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Output per Channel\u003c\/th\u003e\n\u003ctd\u003e120 watts into 8 ohms; 150 watts into 4 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Channels\u003c\/th\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTotal Harmonic Distortion\u003c\/th\u003e\n\u003ctd\u003e0.05%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal-to-Noise Ratio\u003c\/th\u003e\n\u003ctd\u003e95dB below rated output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Headroom\u003c\/th\u003e\n\u003ctd\u003e2.1dB at 8 ohms; 3.3dB at 4 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDamping Factor\u003c\/th\u003e\n\u003ctd\u003eGreater than 65 at 8 ohms; greater than 32 at 4 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Power Band\u003c\/th\u003e\n\u003ctd\u003e20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e+0\/-0.5dB from 20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCircuit Configuration\u003c\/th\u003e\n\u003ctd\u003eClosed-loop digital switching\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput Type\u003c\/th\u003e\n\u003ctd\u003eDirect coupled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAnalog Inputs\u003c\/th\u003e\n\u003ctd\u003eIndividual unbalanced RCA inputs with BUS input and output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDigital Inputs\u003c\/th\u003e\n\u003ctd\u003e2, selectable coaxial or optical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeaker Connections\u003c\/th\u003e\n\u003ctd\u003e2-pole Phoenix-style push-in terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChannel Controls\u003c\/th\u003e\n\u003ctd\u003eIndividual volume controls; local\/BUS and stereo\/mono selection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Control\u003c\/th\u003e\n\u003ctd\u003e12-volt trigger and automatic signal sensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCooling\u003c\/th\u003e\n\u003ctd\u003eFanless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRack Mounting\u003c\/th\u003e\n\u003ctd\u003e2U with removable rack ears\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e17-1\/2 inches W without ears \/ 19 inches W with ears x 4-5\/16 inches H x 21 inches D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnit Weight\u003c\/th\u003e\n\u003ctd\u003e22 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e38.4 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e3-year limited warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eHow many rooms can the McIntosh MI128 power?\u003c\/h4\u003e\n\u003cp\u003eThe eight channels can be arranged as four stereo pairs, making the MI128 suitable for powering up to four conventional stereo zones. Other combinations are possible depending on whether individual areas use stereo or summed mono playback.\u003c\/p\u003e\n\u003ch4\u003eCan the MI128 be used for Dolby Atmos speakers?\u003c\/h4\u003e\n\u003cp\u003eYes. It can power additional surround or height channels when connected to a compatible A\/V processor with unbalanced preamplifier outputs.\u003c\/p\u003e\n\u003ch4\u003eDoes the MI128 have balanced XLR inputs?\u003c\/h4\u003e\n\u003cp\u003eNo. The MI128 uses individual unbalanced RCA inputs, BUS inputs and digital coaxial or optical inputs.\u003c\/p\u003e\n\u003ch4\u003eCan the MI128 be bridged for more power?\u003c\/h4\u003e\n\u003cp\u003eNo. The amplifier does not support mono bridging or parallel channel operation. Each channel is rated independently at 120 watts into 8 ohms or 150 watts into 4 ohms.\u003c\/p\u003e\n\u003ch4\u003eDoes the MI128 require a cooling fan?\u003c\/h4\u003e\n\u003cp\u003eNo. Its efficient Class D design is fanless, helping it operate quietly in a listening room or equipment rack.\u003c\/p\u003e\n\u003ch4\u003eAre rack ears included?\u003c\/h4\u003e\n\u003cp\u003eYes. The MI128 includes removable rack-mounting ears for installation in a standard 19-inch rack.\u003c\/p\u003e\n\u003ch3\u003eAuthorized McIntosh Dealer Support\u003c\/h3\u003e\n\u003cp\u003eAudio Exchange is an authorized McIntosh dealer in Richmond, Virginia. Our team can help determine channel requirements, speaker compatibility, control-system integration and rack-planning needs for distributed audio and home-theater installations. Explore more options in our \u003ca href=\"\/collections\/mcintosh-power-amplifiers\"\u003eMcIntosh Power Amplifiers\u003c\/a\u003e and \u003ca href=\"\/collections\/mcintosh-home-theater\"\u003eMcIntosh Home Theater\u003c\/a\u003e collections.\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":45731948036143,"sku":"MI128","price":4500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/mcintosh-mi128-8-channel-amplifier-angle.jpg?v=1785683651","url":"https:\/\/audio-exchange.com\/products\/mcintosh-mi128-8-channel-amplifier","provider":"Audio-Exchange","version":"1.0","type":"link"}