McIntosh MHA100 Integrated Amplifier For Headphones Or Speakers


Very capable yet diminutive integrated amp from the legendary McIntosh. Made right here in NY.

Capable of driving the most demanding headphones AND highly efficient speakers to good levels.

Has a built-in DAC too to get the most from your digital sources and streaming. (Updated to the newest available firmware direct from McIntosh as of this writing).

Tested and working brilliantly. Cosmetically very clean too.

Your purchase includes the special McIntosh shipping carton, owner's manual, and remote control. 

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - XLR Interconnects

Kimber Kable - Coaxial Digital Interconnect

Kimber Kable - Optical Digital Interconnect

Kimber Kable - Digital AES/EBU (XLR Connector) Interconnect

Kimber Kable - Speaker Cables

Kimber Kable - Power Cords

McIntosh Performance Features Include:
• Power Output
The MHA100 consists of a 50 watts per channel stereo Power Amplifier with less than 0.005% distortion. The McIntosh MHA100 is designed for connection of a single 8 ohm Loudspeaker per channel. The Power Amplifier uses ThermalTrak Output Transistors for lower distortion and cool operation.

• Autoformer Designed for Headphones
The MHA100 is the first McIntosh Amplifier using a specially designed Autoformer for Headphones. There are three selectable impedances ranges, allow connection of Headphones from 8 ohms thru 600 ohms.

• HXD for Headphones
The MHA100 Headphone Crossfeed Director Circuitry (HXD) improves the sound localization for Headphone Listening. HXD restores the directionality component of the spatial sound stage normally heard with Loudspeaker listening.

• Automatic Output Switching
The MHA100 has a Front Panel one-quarter inch Headphone Jack for private listening. Loudspeaker Listening is automatically switched Off when Head- phones are connected.

• Digital Audio Inputs
The MHA100 has Coaxial, Optical, Balanced Digital (AES/EBU) and USB Digital Inputs to decode PCM Signals from an external source. The MHA100 upsamples the Digital Signal to 192kHz with 32Bit resolution before the Digital to Analog process begins.

• Multifunction OLED Display
The Front Panel Display indicates source selection, volume levels, trim settings and setup functions.

Amplifier Specifications
Loudspeaker Power Output
50 watts is the minimum sine wave continuous average power output per channel, both channels operating

Headphone Power Output
1 watt - High Selection
250m Watts - Norm Selection

Loudspeaker Output Load Impedance
8 ohms

Headphone Output Load Impedance
8 - 40 ohms
40 - 150 ohms
150 - 600 ohms

Rated Power Band
20 Hz to 20,000 Hz

Total Harmonic Distortion
0.005% maximum with both channels operating from 250 milliwatts to rated power, 20 Hz to 20,000 Hz

Dynamic Headroom (Loudspeaker)
1.5 dB

Frequency Response
+0, -0.5 dB from 20 Hz to 20,000 Hz
+0, -3.0 dB from 10 Hz to 100,000 Hz

Tone Control
Bass Boost 0 to +12.5 dB (2.5 dB steps) @ 40 Hz

Preamplifier Output (for rated input)
3V (8V Maximun)

Signal To Noise Ratio (A-Weighted)
High Level, 105 dB below rated output

Sensitivity (for rated output)
300 mV unbalanced 600 mV balanced

Intermodulation Distortion
0.005% maximum, if the instantaneous peak power is 100 watts or less per channel with both channels operating for any combination of frequencies from 20 Hz to 20,000 Hz

Wide Band Damping Factor
Greater than 150

Input Impedance
25K ohms unbalanced
25K ohms balanced

Maximum Input Signal
8V unbalanced
16V balanced

Preamplifier Output Impedance
500 ohms

Power Guard
Less than 2% THD with up to 16 dB overdrive at 1,000 Hz

Voltage Gain
36.5 dB

Digital Input Sample Rates
Optical: 16Bit, 24Bit - 32kHz to 192kHz
Coaxial: 16Bit, 24Bit - 32kHz to 192kHz
AES/EBU: 16Bit, 24Bit - 32kHz to 192kHz
USB: 16Bit, 24Bit, 32Bit - 32kHz to 192kHz

Power Control Input
5-15VDC, < 1mA

Power Control Output
12VDC, 25mA maximum

General Specifications
Power Requirements
Field AC Voltage conversion of the MHA100 is not possible.
The MHA100 is factory configured for the the following AC Voltage:
120 Volts, 50/60Hz at 1.5 amps

Standby Power Usage:
Less than 0.25 watt

Overall Dimensions
Width is 11-1/2 inches (29.2cm)
Height is 5-9/16 inches (14.1cm) including feet
Depth is 18 inches (45.7cm) including the Front Panel, Knobs and Cables

26.5 pounds (12 kg) net
32.5 pounds (14.8 kg) in shipping carton

The SkyFi Testing Process for Integrated Solid State Amplifiers:
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.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.



Original Box



Yes and Online




Yes - Power Only

Physical Condition


Working Condition


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