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Author Topic: Oppo PM-1s  (Read 11723 times)

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ultrabike

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Oppo PM-1s
« on: May 12, 2014, 06:43:14 AM »

Lots of impressions about these in this thread:

http://www.changstar.com/index.php/topic,1589.0.html

Frequency Response



Distortion Right



Distortion Left



CSD Right



CSD Left



PM-1 vs HD600



Note the distortion levels in the upper bass and lower mids which peak to about 3.5%. This might, at least in part, explain the low-fi-ness issues which a kilo-buck can should not exhibit.

Relative to the HD600s, these exhibit less bass and some loss in the 2.5 to 5 kHz region (specially in the 3 to 4 kHz range). I still feel these are somewhat neutral... a little south in the bass, but not too bad IMO.

EDIT: Also note less air in the PM-1s, which may explain why some felt these sounded a bit like closed cans.
« Last Edit: May 12, 2014, 02:48:53 PM by ultrabike »
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Solderdude

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Re: Oppo PM-1s
« Reply #1 on: May 12, 2014, 09:59:36 AM »

Thanks,

Explains a lot to me.

Thanks for posting these.
The FR plot is missing the 10kHz to 20kHz part (in IEM measuring setting ?) but is shown in the THD plots.
« Last Edit: May 12, 2014, 10:02:14 PM by Solderdude »
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ultrabike

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Re: Oppo PM-1s
« Reply #2 on: May 12, 2014, 02:49:27 PM »

Thanks SD! corrected plots :)p5
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jerg

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Re: Oppo PM-1s
« Reply #3 on: May 12, 2014, 02:52:47 PM »

Looks VERY similar to the jergpadded HE500, minus the bass tilt (this one goes down while HE500's go up).

Ultrabike did you also get a chance to measure the HE560s at the meetup?
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firev1

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Re: Oppo PM-1s
« Reply #4 on: May 12, 2014, 04:23:40 PM »

Wow thats pretty shitty for such an expensive headphone. Wonder why they tuned the treble like that?
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ultrabike

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Re: Oppo PM-1s
« Reply #5 on: May 12, 2014, 04:31:42 PM »

Looks VERY similar to the jergpadded HE500, minus the bass tilt (this one goes down while HE500's go up).

Ultrabike did you also get a chance to measure the HE560s at the meetup?

Well, the jergpadded HE500 did not seem to have that many issues with distortion and seemed to have more air. Unfortunately I did not bring my measurement rig for the HE560s. It was pretty awesome though.

Wow thats pretty shitty for such an expensive headphone. Wonder why they tuned the treble like that?

Could be that both extension and distortion are driver limitations, but dunno.
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jerg

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Re: Oppo PM-1s
« Reply #6 on: May 12, 2014, 05:06:57 PM »

Looks VERY similar to the jergpadded HE500, minus the bass tilt (this one goes down while HE500's go up).

Ultrabike did you also get a chance to measure the HE560s at the meetup?

Well, the jergpadded HE500 did not seem to have that many issues with distortion and seemed to have more air. Unfortunately I did not bring my measurement rig for the HE560s. It was pretty awesome though.


Even though HE500s roll off in the upper treble too, it's not nearly as severe as the drop with PM1 past 10kHz. Makes sense that the relatively better extension contributes to airiness.
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Anaxilus

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Re: Oppo PM-1s
« Reply #7 on: May 12, 2014, 07:57:38 PM »

Did anyone check the gorgeous box for specs from Oppo, did it read 20hz-13khz @ -7dB??

So who's ready to put down a mortgage payment for these? Maybe Bigshot??  :)p8  Now we know why everything sounds the same to him if this is his standard reference.   facepalm
« Last Edit: May 12, 2014, 09:21:40 PM by Anaxilus »
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ultrabike

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Re: Oppo PM-1s
« Reply #8 on: May 12, 2014, 09:01:59 PM »

 :)p13 That was some serious (and heavy) box there. Post Office will love it. Costumer return discouragement.
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n3rdling

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Re: Oppo PM-1s
« Reply #9 on: May 12, 2014, 11:23:42 PM »

I don't think Bigshot has heard anything but the HD650 and the PM-1.  Anytime he's asked he ignores the question and responds to something else instead.
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