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Introduction
Now you can take advantage of traditional McIn-
tosh standards of excellence in the MHA150 Head-
phone Amplifier. The Power Amplifier section of the
MHA150 will drive Headphones or a pair of quality
Loudspeakers to a high level of performance.
The flexible Preamplifier section provides con-
nections for various input sources, including Digital
sources and music streaming from the Internet via an
USB Computer connection.
The MHA150 reproduction is sonically transparent
and absolutely accurate. The McIntosh Sound is "The
Sound of the Music Itself."
Performance Features
• Power Output
The MHA150 consists of a 50 watts per channel stereo
Power Amplifier with less than 0.005% distortion.
The McIntosh MHA150 is designed for connection of
a single 8 ohm Loudspeaker per channel. The Power
Amplifier uses ThermalTrak
Output Transistors for
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lower distortion and cool operation.
• Autoformer Designed for Headphones
The MHA150 Amplifier uses a specially designed Au-
toformer for Headphones. There are three selectable
impedances ranges, allowing connection of Head-
phones from 8 ohms thru 600 ohms.
• HXD
for Headphones
®
The MHA150 Headphone Crossfeed Director Cir-
cuitry (HXD
improves the sound localization for
® )
Headphone Listening. HXD
restores the direction-
TM
ality component of the spatial sound stage normally
heard with Loudspeaker listening.
ThermalTrak™ and ON Semiconductor are trademarks of Semi-
1
conductor Components Industries, LLC
®
HXD
is a registered trademark of McIntosh Laboratory, Inc.
• Automatic Output Switching
The MHA150 has a Front Panel one-quarter inch
Headphone Jack for private listening. Loudspeaker
Listening is automatically switched Off when Head-
phones are connected.
• Four Forms of Protection
McIntosh Sentry Monitor Protection Circuits ensure a
long and trouble free operating life. It also protects the
Headphones in the event of an impedance mismatch.
Thermal Protection guards against overheating and
Direct Current Detection Protects both Headphones
and Loudspeakers.
• Power Guard
The patented McIntosh Power Guard circuit prevents
amplifier clipping and protects your valuable Head-
phones and Loudspeakers.
• Electronic Switching for Analog Inputs
The Preamplifier uses Logic Circuits controlling Elec-
tromagnetic Switches for reliable, noiseless, distortion
free switching. There is a Balanced and Unbalnced
Input for connection of source components.
• Digital Audio Inputs
The MHA150 has four Digital Audio Inputs to decode
PCM Signals. When the Coaxial, Optical and MCT
Inputs receive a PCM Signal, the MHA150 upsamples
the Digital Signal to 192kHz with 24Bit resolution
before the Digital to Analog process begins. The
Digital MCT Input Circuitry directly decodes SACD/
CD signals from an external Transport component.
The USB Input for streaming audio, processes Digital
Signals up to 384kHz with 32Bit resolution, decodes
up to DSD256 Digital Signals and DXD 24Bit with a
sampling rate up to 384kHz.
Introduction and Performance Features
• Multifunction OLED Display
The Front Panel Display indicates source selection,
volume levels, trim settings and setup functions.
• Illuminated Meters
The Illuminated Power Output Meters on the
MHA150 are peak responding, and indicate the output
of the amplifier.
• Power Control and Remote Control
The Power Control Output connection provides conve-
nient Turn-On/Off of McIntosh Source Components.
• Special Power Supply
The large Power Transformer, multiple large filter
capacitors and regulated Power Supply ensure stable
noise free operation even though the power line varies.
• McIntosh Custom Binding Posts
McIntosh Patented gold plated output terminals deliver
high current output. They accept large diameter wire
and spade lugs. Banana plugs may also be used only in
the United States and Canada.
• Glass Front Panel and Super Mirror Chassis
The MHA150 has the famous McIntosh Illuminated
Glass Front Panel and Stainless Steel Super Mirror
Finish Chassis. This ensures the pristine beauty of the
MHA150 will be retained for many years.
• Fiber Optic Solid State Front Panel Illumination
The even Illumination of the Front Panel is accom-
plished by the combination of custom designed Fiber
Optic Light Diffusers and extra long life Light Emit-
ting Diodes (LEDs).
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