Topic: Oppo PM-1s (Read 11728 times)

Out Of Your Head · « **Reply #10 on:** May 13, 2014, 12:28:44 AM »

Quote from: Anaxilus 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?? Now we know why everything sounds the same to him if this is his standard reference.

I wish my mortgage payment was only $1100...

Well, the specs on their website says:
"Frequency Response In Free-Field : 10hz - 50kHz"
They forgot to put "@ -100 dB" at the end of the spec sheet.

I guess everyone's measurements are wrong.

Out Of Your Head · « **Reply #11 on:** May 13, 2014, 12:40:08 AM »

Whoa, check out these measurements of the PM-1:

http://www.audioholics.com/headphone-reviews/oppo-pm-1/measurements

ultrabike · « **Reply #12 on:** May 13, 2014, 12:51:55 AM »

WTF! Everything is flat!

OK.... about 60 dB of SPL range & stretched a bit on the y-axis = everything is flat.

They do show a slant down but I got it at 1kHz instead of 500 Hz (so did Tyll it seems). Furthermore, there should be a peak around 10 kHz which is all but gone on those... Not sure how they got those upper treble results either.

I think their HD600 measurements made more sense (though too rolled off on the bass area based on what I hear and measured)... Dunno.

+++

"They [PM-1 vs HD600] not only sounded louder but ~~fuller~~muddier, especially in the midrange."

"...the high frequencies were a bit more laid back on the PM-1s while they were a bit more detailed and airy on the HD600s." <- that I agree.

Maxvla · « **Reply #13 on:** May 13, 2014, 02:03:09 AM »

He made an ear out of a styrofoam cup and you guys are surprised by the measurements?

Hands · « **Reply #14 on:** May 13, 2014, 04:24:47 AM »

LOL, styrofoam cup.

ultrabike · « **Reply #15 on:** May 13, 2014, 04:46:45 AM »

Nah maybe that works out. Seems a similar cup was used for the HD600 measurements.

That said, given the extra volume to drive, the bass roll of in the HD600 measurements make sense to me. Not sure what to make of the PM-1s... Maybe I'll give the styrofoam cup a try later...

Maxvla · « **Reply #16 on:** May 13, 2014, 05:07:22 AM »

That measurement of the HD600 is nothing like any other measurement out there.

ultrabike · « **Reply #17 on:** May 13, 2014, 05:43:20 AM »

I think the styrofoam cup yields more volume than the cans are supposed to drive. The upper mids and treble on the HD600 measurements don't look that bad to me. Perhaps a bit too smoothed out. However the lows really went down south.

That's why I'm sort of surprised the PM-1s measured flat all the way down to 20 Hz under similar conditions ... but dunno.

AZ · « **Reply #18 on:** May 13, 2014, 06:59:04 PM »

Seems like with Styrofoam they isolated the driver from the original acoustic environment of a given can quite a bit. Therefore pads for example don't have much affection to the resulting FR anymore. The original headphone volume was also compromised which leads to a weird overall balance. On top of that HF amplification also seems to go into play via reflective surface of a given Styrofoam.

ultrabike · « **Reply #19 on:** May 27, 2014, 04:52:11 AM »

Alex sent me his modified Oppo PM-1 cans. Thanks mang

I do not have the stock PM-1s with me anymore, but at the meet I thought the modded PM-1s had a little more bass than what I'm hearing right now. Who knows, maybe I'm a bass head or something. Anyway, to me the impact is perhaps lessened (even from the stock if my memory serves me), but it's not gone. If anything, these are a little more laid back in the bass region. The treble is pretty good. I think the treble on this is an improvement over the stock. More airy. It is a bit brighter though.

I dig these. They sound perhaps a little less low-fi to me. Note I did not dislike the PM-1s in their stock form, but didn't go crazy about them either.

These seem also a little heavier than the previous ones I heard (perhaps due to the mods). Still, pretty comfy though, and not as heavy as some other orthos.

Here are some measurements...

Frequency Response

Distortion Right

Distortion Left

CSD Right

CSD Left

Impedance

Author Topic: Oppo PM-1s (Read 11728 times)

Out Of Your Head

Re: Oppo PM-1s

Out Of Your Head

Re: Oppo PM-1s

ultrabike

Re: Oppo PM-1s

Maxvla

Re: Oppo PM-1s

Hands

Re: Oppo PM-1s

ultrabike

Re: Oppo PM-1s

Maxvla

Re: Oppo PM-1s

ultrabike

Re: Oppo PM-1s

AZ

Re: Oppo PM-1s

ultrabike

Re: Oppo PM-1s

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Author Topic: Oppo PM-1s (Read 11728 times)