Headphone Amplifier: The McIntosh MHA150 headphone amplifier is
designed to give you the best possible personal listening experience available.
The MHA150 offers a wide variety of balanced and unbalanced analog and digital
inputs, as well as headphone and speaker outputs. You can select a High or Low
headphone output level, as well as a headphone impedance range to give you the
best performance. The MHA150 has a more compact chassis than other McIntosh
amplifiers, giving you more installation options.
Front-Panel: The headphone amplifier's front-panel features a
multi-function OLED display to indicate source selection, volume levels, trim
settings, and setup functions. Dual illuminated Power Output Meters indicate the
output of the amplifier, and respond to peaks in the output.
Power Supply: The MHA150 utilizes a large power transformer, multiple
large filter capacitors, and a regulated power supply. The power supply responds
to variations in the power line voltages to provide rock solid power to the
Protection Circuits: The unit is protected by four forms of
protection. McIntosh Sentry Monitor power output stage protection circuits
protect the headphone amp and the headphones in case there is an impedance
mismatch. The unit also has Thermal Protection circuits to protect the unit from
overheating, while Direct Current Detection and Protection is also provided for
the amp and headphones. To prevent overheating, at least 6" of air space should
be provided above, and 2" on each side of the unit.
Analog Inputs: The MHA150 headphone amplifier will accept both
balanced and unbalanced analog inputs. A pair of female XLR inputs on the rear
panel accept a high level signal from a source with a balanced output. A pair of
stereo RCA jacks is provided to connect a source with an unbalanced output.
Digital 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 (958MCT450,
sold separately). The USB-B 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.
- Optical: 16-bit/24-bit, 32kHz to 192 kHz
- Coaxial: 16-bit/24-bit, 32kHz to 192 kHz
- MCT: 16-bit/24-bit, 32kHz to 192 kHz
- USB-B: 16-bit/24-bit/32-bit, 32kHz to 384 kHz
USB Compatibility: The MHA150's USB input allows you to play
music from a computer when connected via a USB cable. The USB input is
compatible with PCs using Windows Vista (SP2), Windows 7 (SP1), and Windows
8/8.1 (SP1), and Windows 10. It is also compatible with Apple Macintosh
computers using OS X 10.9 Mavericks or later. You may be required to download a
USB Windows driver to your PC before you connect it to the headphone amp.
Headphone Output: The McIntosh MHA150 headphone amplifier is equipped
with a high quality 1/4" (6.3mm) headphone output.
- Headphone Power Output: 1 watt (High); 250 mW (Normal)
- Headphone Load Impedance: 8-40 ohms; 40-150 ohms,
HXD: The built-in Headphone Crossfeed Director (HXD) circuitry
provides the same spatial soundstage in your headphones that you would normally
hear when listening to conventional loudspeakers. The HXD circuitry achieves
this by improving the sound localization and directionality of the sound coming
through your headphones. You can turn HXD on or off as you desire by momentarily
pressing the volume control on the front panel. The HXD icon above the headphone
jack will illuminate when activated.
Speaker Outputs: In addition to the headphone output, the MHA150 has a
50 watts per channel stereo power amplifier. McIntosh's patented gold-plated
binding post speaker terminals will accept large diameter speaker wire, spade
lugs, and banana plugs. The speaker outputs are rated for 8 ohm loudspeakers.
- Loudspeaker Power Output: 50 watts per channel (minimum
sine wave continuous average power output, both channels operating)
- Loudspeaker Load Impedance: 8 ohms
Note: When headphones are plugged into the front panel 1/4"
output, the loudspeakers are automatically switched off.
Output Control: The MHA150 uses a specially-designed Autoformer for
Headphones technology that gives you three selectable impedance ranges, as well
as a low and high output level for best headphone performance. Using the Output
Control dial, you can select from the following outputs:
|Listening Device ||Impedance ||Power Level ||Output |
|Loudspeakers ||8 ohms ||--- ||50 watts |
|Headphones ||8 to 40 ohms ||Normal ||250 mW |
|Headphones ||40 to 150 ohms ||Normal ||250 mW |
|Headphones ||150 to 600 ohms ||Normal ||250 mW |
|Headphones ||8 to 40 ohms ||High ||1 Watt |
|Headphones ||40 to 150 ohms ||High ||1 Watt |
|Headphones ||150 to 600 ohms ||High ||1 Watt |
Preamp Outputs: The MHA150 provides a pair of RCA preamp
output jacks that allow you to connect a separate power amplifier or a powered
subwoofer. There are two Subwoofer Mode settings: the Disabled setting provides
a stereo signal at the preamp output jacks, while the Enabled setting combines
the left and right channel signals into a monaural signal at both preamp output
Power Control Jacks: The 3.5mm Power Control Input jack
receives +12V DC power on/off signals when the headphone amp is connected to
another McIntosh component. The 3.5mm Power Control Output jack sends +12V DC
power on/off signal to other McIntosh components. Stereo 3.5mm miniplug cables
are used for connection to the Power Control jacks.
Trim: The MHA150's Trim Functions allows you to make several
adjustments to the audio and display. Trim functions include Bass Boost (0 to
+12.5dB @ 40Hz),
Balance, Level (input trim), Mono/Stereo, Meter Backlight, Display
(information), and Digital Audio (display information). The Bass Boost, Balance,
Level (input trim), and Mono/Stereo Trim Settings are stored independently for
each input selected. The other Trim Settings are the same for all inputs. Trim
adjustments can be made on the front panel or the included remote control.
Profiles: You can set and store up to five different Profile
settings for headphone listening, each with an assigned custom name. Each
profile setting includes the stored selections for Headphone Impedance Range,
Power Level, HXD (On or Off), and Bass Boost (0 to +12.5 dB). Profiles can
be recalled by turning the ring around the volume control knob.
Remote Control: A wireless remote control (HR079) is
supplied with the MHA150, allowing you to power on/off the headphone amplifier,
as well as perform other functions. You can control volume, mute, select inputs,
and select and adjust Trim functions. The remote can also select preset stations
on many McIntosh tuners.