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McIntosh MX150 Flagship Theater Processor and Preamplifier, Built-In RoomPerfect

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Pickup currently unavailable at SkyFi 479

Mcintosh Mx150 Flagship Theater Processor And Preamplifier Built-In Roomperfect

McIntosh MX150 Flagship Theater Processor and Preamplifier, Built-In RoomPerfect

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


The MX150 was the flagship theater processor from McIntosh a few years back. 

Some of the feature highlights include balanced XLR inputs and outputs, five HDMI inputs to cover all your sources, and the RoomPerfect digital room correction system. 

This particular unit is in great condition with no signs of use or wear. The glass is perfect and the paintwork is free from scratches or dents. 

The plastic coating on the remote is a bit sticky but works great.

McIntosh MX-150 - Owner's Manual

More from McIntosh:

Some Performance Features Include:
• RoomPerfect Automatic Measurement
The RoomPerfect Automatic Measurement System provides precise adjustment of Loudspeaker Volume Levels, Time Delay and Equalization for all eight channels. Supplied Calibrated Microphone with stand/ boom allows for the multiple room measurements for precise adjustments.

• Balanced Inputs and Outputs
Two pairs of Balanced high level Inputs and an eight channel Balanced Output are provided, permitting long cable lengths without a loss in sound quality.

• Moving Magnet Phono Input
There is a Precision Phono Preamplifier for Moving Magnet Cartridges.

• LED Channel Status Indicators
The MX150 includes twenty-five LEDs on the front panel to indicate what type of operating signals are being received, signal processing mode and the output format chosen.

• Special Power Supply
The Power Supply has Multiple Regulators to ensure stable noise free operation even though the power line varies.

• On-Screen and Multifunction Fluorescent Displays
A comprehensive On-Screen Display capability makes it easy to perform setup and operational adjustments using the Remote Control. The front panel display indicates input selection, volume levels, and other operating functions.

• HDMI Audio/Video Switching with Up- Conversion Processing
There are five HDMI Inputs and any Composite Video, S-Video, Component Video Input (Analog Video Signals) can be converted to a Digital Video Signal with the built-in Digital Video Conversion Circuitry.

Audio Specifications
Unless otherwise noted, the below MX150 Specifications where taken with RoomPerfect set to Bypass Mode and Voicing Mode set to Neutral.

Frequency Response
Left, Center, Right, Left Surround, Right Surround, Left Back Surround, Right Back Surround:
±0.5dB from 20Hz-20,000Hz

±0.5dB from 20Hz-8000Hz

Total Harmonic Distortion
0.005% maximum from 20Hz to 20,000Hz at rated output

Signal To Noise Ratio
Phono: 86dB below 10mV input (A Weighted) High Level: 96dB below rated output (A Weighted)

Rated Output Voltage
2.5V Unbalanced Outputs (Main) 5.0V Balanced Outputs (Main)

Maximum Voltage Output
6.5V Unbalanced (8.5V Subwoofer) 13V Balanced (17V Subwoofer)

Output Impedance
75 ohms Unbalanced 100 ohms Balanced

Input Impedance
Phono: 47k Ohms, 65pf
High Level: 10k Ohms Unbalanced and Balanced

RoomPerfect and Voicing Specifications
Sensitivity for Rated Output
Phono: 5mV
High Level: 500mV Unbalanced
1V Balanced

Maximum Input Signal
Phono: 50mV
High Level: 4.5V Unbalanced and Balanced

Tone Controls
Bass Control: ±10dB at 30Hz
Treble Control: ±10dB at 10,000Hz

Overall Dimensions
Width is 17-1/2 inches (44.45cm)
Height is 7-5/8 inches (19.37cm) including feet
Depth is 19-1/2 inches (49.53cm) including the Front Panel, Knobs, Rear Panel Connections and USB Drive

31 pounds (14.06Kg) net, 55 pounds (24.95Kg) ship- ping

Shipping Carton Dimensions
Width is 25 inches (63.5cm) Depth is 28 inches (71.12cm) Height is 18-3/8 inches (46.67cm)

The SkyFi Testing Process for Processors and Preamplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. Special attention is paid to the power supply which is the most common source of failure for preamps. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline.

At this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching.

Final testing involves putting actual music through the preamplifier. We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Our test bench has reference vintage KEF speakers that we are super familiar with which will quickly reveal any discrepancies. Some preamps will then move into the listening room where they will be tested with our in-house reference system.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



McIntosh Official Shipping Carton

Yes (Brand New)


Yes and Online




Yes - Power

Physical Condition


Working Condition


SKU: 103146