The versatile MI128 8-Channel Digital Amplifier can be used in many applications ranging from distributed audio to home theater to stereo listening. It delivers 120 Watts into 8 Ohm speakers or 150 Watts into 4 Ohm speakers via highly sophisticated closed-loop digital switching amplifiers that are paired with extremely robust power supplies to produce performance levels that are rarely achieved in distributed audio.
It 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.
On the front panel, multi-color LED indicators display the status of each channel. On the back are unbalanced inputs for each channel plus 2-pole Phoenix style push-in speaker terminals. Also located on the back are volume controls for volume balancing, along with 2 digital audio inputs either coax or optical that can be bussed and channel summing circuits for easy mono signal distribution.
Other features included on the MI128 are: Loudspeaker Guard signal overload technology that prevents overdriving the speakers; our Sentry Monitorâ„¢ 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 & 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.
The MI128 includes many McIntosh design cues including a black glass front panel housing an illuminated McIntosh logo, along with a familiar form factor that is highlighted with silver trim.
SPECIFICATIONS
Electronic Specifications
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- Power Output per Channel: 120 Watts into 8 Ohms | 150 Watts into 4 Ohms
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- Number of Channels: 8
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- Total Harmonic Distortion: 0.05%
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- S/N below-rated output: 95dB
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- Dynamic Headroom: 8 Ohms: 2.1dB | 4 Ohms: 3.3dB
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- Damping Factor: 8 Ohms: >65 | 4 Ohms: >32
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- Rated Power Band: 20Hz to 20kHz
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- Frequency Response: +0, -0.5dB from 20Hz to 20,000Hz
Control
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- Remote Power Control: Yes
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- Multi-Channel DB25 Cable: N/A
Connectivity
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- Speaker Binding Post Type: 2-pole Phoenix style push-in speaker terminals
General Specifications
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- Circuit Configuration: Closed-loop digital switching
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- Circuit Design: Digital
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- Mono Bridget: N/A
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- Mono Parallel: N/A
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- Output Type: Direct Coupled
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- Meters: No
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- Meter Light Switch: No
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- Balanced Input: 0
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- Front Panel: Glass with removable rack mounting ears
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- Illumination: Direct LED
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- Chassis Style: Black painted steel
Weights & Dimensions
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- Dimensions (W x H x D): 17-1/2" (44.45cm) (19" (48.3cm with mounting ears)) x 4-5/16" (11cm) (including feet) x 21" (53.3cm) (including front panel and cables)
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- Weight: 22 lbs (10 kg)
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- Shipping Weight: 38.4 lbs (17.4 kg)