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Oppo PM-1 Measurements & Analysis

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Oppo claims the PM-1 driver is made of a very thin and light diaphragm whose entire surface area is evenly driven exhibiting piston like behavior.  The double sided diaphragm provisions for twice as many conductors within the magnetic field allowing for greater efficiency, reduction in inductance related intermodulation distortion also making the headphones a purely resistive impedance. 

pm-1 impedance

Oppo PM-1 Impedance & Phase Response

Oppo’s claim of purely resistive load seems very plausible.  As you can see the PM-1s essentially measure like a straight line at 32 ohms with no appreciable phase shift in the entire audio band.  This should allow the PM-1s to sound consistently good regardless of the headphone amplifier output impedance which is an excellent design goal.

pm-1 frequency response

Oppo PM-1 Frequency Response

I constructed a very primitive ear by placing a microphone inside a styrofoam cup and positioned the headphones at the open end.  As you can see from the graph, these headphones are extremely linear.  In fact this is the best measurement I’ve ever pulled on a headphone system and explains why these headphones sound so tonally neutral and accurate.

 

 

 

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Recent Forum Posts:

AJM posts on November 13, 2015 20:05
I have owned these headphones for about a month. They are simply the best sounding and most comfortable headphones I have ever owned. I can listen to them for hours with no discomfort or listening fatigue. They replaced a set of Grado GS1000e cans, and although they are in the same price bracket, the PM-1 is everything the Grados should have been.
Karen Molinares posts on January 31, 2015 23:54
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Oppo PM-1 and PM-2 Headphone Review and Comparison
scaredsharp posts on September 11, 2014 18:27
Me want please pleaze
j_garcia posts on August 26, 2014 14:13
Got to hear these over the weekend. Honestly? They rock. As clear of a headphone as I've ever heard. Great sound top to bottom and bass was quite good. Most important thing I think though, they're really comfortable.
lillyblack82888 posts on July 15, 2014 18:41
Mm I may have to try these… they sound good.
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