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  #1  
Old 02-15-2014, 12:08 PM
htradtk htradtk is offline
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Default McIntosh MPI 4
Greetings!

Was looking at E-Bay this morning and came across an interesting McIntosh product from the early 70's, the McIntosh MPI 4 (Maximum Performance Indicator). Does anyone out there know how this was used? Just curious.

Henry
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  #2  
Old 02-15-2014, 12:39 PM
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GaryProtein GaryProtein is offline
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I own one.

It was/is used as an FM tuner signal strength/multipath meter, power amplifier watt meter, balance meter/lissajous stereo display and dual trace oscilloscope. It was of greater value in the past than now, although it is cool to look at now.

Components now have better channel balance and tuning than in the past, so it really is kind of obsolete, although it can be used for simple trouble shooting of inter channel discrepancies.

See it in the photo of my system near the top of the stack in my signature below.
Last edited by GaryProtein; 02-15-2014 at 10:34 PM.
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Old 02-15-2014, 12:42 PM
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Here you go Henry...from the owner's manual:

"The MPI-4 is a laboratory grade instrument. It provides the facility to continuously monitor the quality of the performance of a stereo system. The MPI-4 can sample and display signals from the tuner, preamplifier, and power amplifier without reconnecting cables. Signals are displayed on an oscilloscope screen calibrated with scales for tuning, measuring and testing."

Douglas
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Old 02-15-2014, 02:48 PM
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There were also two earlier models, the MPI 2 the MPI 3 which were more basic.

MPI 4 was made from 1973 to 1977.
Last edited by 62caddy; 02-15-2014 at 02:52 PM.
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  #5  
Old 02-15-2014, 03:53 PM
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More details here

McIntosh MPI4
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  #6  
Old 02-15-2014, 03:57 PM
jbaudio68 jbaudio68 is offline
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Just sold one these for a friend. Really interesting piece of equipment . AC has some listed on their site too.
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Old 02-15-2014, 05:23 PM
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Obsolete or not, it is still a very cool piece. I wouldn't mind having one.
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Old 02-15-2014, 07:38 PM
htradtk htradtk is offline
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Thanks guys for the details. Looks like it was an advanced piece back in it's day.

Henry
Last edited by jdandy; 02-15-2014 at 08:26 PM. Reason: Promoting web auction sites against forum rules.
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Old 02-15-2014, 09:12 PM
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Pretty cool.

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Old 03-28-2015, 12:18 PM
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How can the MPI4 be used to set up a turntable azimuth, anti-skate, etc?
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