McIntosh MPI-4 Brochure

The MPI 4 is a laboratory-grade in­strument. It continuously monitors
the quality of the performance of a
stereo system. It can sample and dis­play signals from the tuner, preampli­fier and power amplifier without re­connecting cables.

As a tuning aid exact FM station
selection and precise tuning is seen.
Displays of FM are signal strength,
modulation percentage and multipath
interference; of audio signals are
stereo balance, amplitude, phase and
channel separation. Output power of
the power amplifier can be seen at
any instant during program perform­ance, or stored to develop a trend
over several minutes. With the addi­tion of test records, the MPI 4 can
show compliance and trackabilily of

a phono pickup, frequency response
of the preamplifier and power ampli­fier, audio distortion and stereo
speaker balance. In the dual trace
mode, the left and right stereo chan­nels appear simultaneously and sepa­rately on the screen for direct com­parison.

In short, the MPI 4 is a professional

measuring instrument that assures

you continuously that your system is
performing as expected. You never
again need to wonder about the per­formance of your stereo.

MAXIMUM

PERFORMANCE

INDICATOR

• maximum performance from your stereo system •"once in

• a view of the separation provided on any signal source

• absolute balance of your stereo channels from phono cart

DUAL TRACE

Each channel of stereo signal is displayed
individually in the dual trace mode of opera­tion. Comparison of the signals assists in
comparison of recordings, the quality of
stereo information in the source and much
other valuable information.

The MPI4

LEVEL

The audio level of stereo signals is dis­played as two vertical columns on the
screen. The height of each column is deter­mined by the power or amplitude of the
input signal.

Action can be stopped and held to permit
close comparison between the highest
levels attained by left and right channels.

PHONO CARTRIDGE CALIBRATION

You will protect your record investment,
extend the life of your records, and reduce
needle wear when the turntable is properly
set up. With the aid of test recordings the
MPI 4 will assist in this proper set up. The
display assists in properly adjusting for

proper tracking force, best tracing vs track­ing force, anti-skate, proper phasing, and

channel separation.

FM TUNING

You'll see signal strength, center channel
FM tuning and a reference for multipath
distortion elimination. The image is a dis­play of the tuner IF curve. Signal strength is
the vertical axis. Horizontal center is the
center of the detector and IF curves. Proper

tuning gives minimum distortion and maxi­mum listening pleasure on all kinds of FM
broadcasts.