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PSB M4U 2 - Page 20

post #286 of 535

Out of interest did PolkManiac ever write his conclusion on the M4U 2s v Ultrafocus 8000? I had a look but couldn't find it.

post #287 of 535
Quote:
Originally Posted by JimBob1971 View Post

Out of interest did PolkManiac ever write his conclusion on the M4U 2s v Ultrafocus 8000? I had a look but couldn't find it.


Here you go:

http://www.head-fi.org/t/605079/psb-m4u-2/60#post_8550433

post #288 of 535

I received my replacement set for the 'popping' issue in the right ear but mono/centre sounds seems to be slightly to the right.

 

Can anyone suggest a rough guide as to what is acceptable in terms of stereo balance? The first set were perfectly balanced so that anything in the centre would sound as such. If 0 is directly in front and 90 is directly to the right then this pair are between 5% and 10%. I wore the phones back to front and the sound now came more from the left (whereas the original pairs didn't) so it isn't my hearing or imagination :)

 

I'm loathe to send them back and buy yet another pair. Perhaps I am being too picky? I watch a lot of films, and main dialogue being a bit to the right would bug me immensely.


Edited by JimBob1971 - 12/26/12 at 4:42am
post #289 of 535
Quote:
Originally Posted by JimBob1971 View Post

I received my replacement set for the 'popping' issue in the right ear but mono/centre sounds seems to be slightly to the right.

 

Can anyone suggest a rough guide as to what is acceptable in terms of stereo balance? The first set were perfectly balanced so that anything in the centre would sound as such. If 0 is directly in front and 90 is directly to the right then this pair are between 5% and 10%. I wore the phones back to front and the sound now came more from the left (whereas the original pairs didn't) so it isn't my hearing or imagination :)

 

I'm loathe to send them back and buy yet another pair. Am I being too picky?

IMO, if you can hear an imbalance, it is not acceptable.

post #290 of 535
Quote:
Originally Posted by Craigster75 View Post

IMO, if you can hear an imbalance, it is not acceptable.


I concur

post #291 of 535
Quote:
Originally Posted by Craigster75 View Post

IMO, if you can hear an imbalance, it is not acceptable.

 

Quote:
Originally Posted by yomomma1 View Post


I concur

 

Thanks guys. I'll see what Amazon say. I still have two pairs as I'm awaiting the first set to be picked up for return, and bought the 2nd pair without any money being refunded. Somehow I think a third pair might be excessive until I receive some money back for the first two sets biggrin.gif Shame about the popping issue, the first set sounded great.


Edited by JimBob1971 - 12/26/12 at 8:37am
post #292 of 535

Hi,

I live in Canada and I wish to know where can I buy the Psb m4u  headphones. 

thanks
 

post #293 of 535

Try HERE

post #294 of 535

Hi,

 

Thank you for your post. I bought the Bose Q15s and have a subway commute. The noise cancelling was great, but the pressure on my ears was way too much and I had to return them. I am wondering if you get that pressurized sensation with the PSB M4U 2s? I seem to be particularly sensitive to that.

 

Thank you.

post #295 of 535
I'm sensitive to that as well and had to return several headphones because of it, glad to hear I'm not the only one.

I have no issues like this on the PSB, although they don't cancel quite as well as the Bose
post #296 of 535

I've been driving my new M4U 2s off my iPod. Good stuff, although the sound reduction is not what it might be in some situations. But that's not really why I bought them so no biggie. But I plugged into my Denon DRA-455 and disaster. This is a room-system amp with a headphone jack as opposed to a headphone amp but still... On active, the sound was fine but a LOT of noise at low volumes but on passive, unlistenable. Clipping and massive ditortion. I aborted for fear of damage. I had wondered about the low input impedance of the M4Us in passive mode but this appears to be a real manifestation of it. Any suggestions?

post #297 of 535

Hmm. With apologies, I now cannot fully replicate the passive problem. The noise is still immense on active but for that I blame the amp. Based on a lot of painful experience debugging, I switched the adapter and the distortion in passive mode cleared, even when going back to the original adapter. So it must have been a residual piece of swarf or something. 

 

Separately, I found the M4U 2s sat on my pinneas, leading to discomfort. I have a simple mod, if anyone else is experiencing this (I know at least one reviewer did http://www.audio-ideas.com/canadian/psb-m4u2.html ).

post #298 of 535
Quote:
Originally Posted by wportre View Post

I've been driving my new M4U 2s off my iPod. Good stuff, although the sound reduction is not what it might be in some situations. But that's not really why I bought them so no biggie. But I plugged into my Denon DRA-455 and disaster. This is a room-system amp with a headphone jack as opposed to a headphone amp but still... On active, the sound was fine but a LOT of noise at low volumes but on passive, unlistenable. Clipping and massive ditortion. I aborted for fear of damage. I had wondered about the low input impedance of the M4Us in passive mode but this appears to be a real manifestation of it. Any suggestions?


I would expect that double-amplifying any headphone would produce increased noise. Stop doing that!

post #299 of 535

Fair enough, but that does knock out the noise reduction mode. At least the M4Us have a passive mode; your reply suggests that eg Bose QC15s can never be used as "normal" headphones in a headphone jack. 
 

post #300 of 535
Quote:
Originally Posted by wportre View Post

Fair enough, but that does knock out the noise reduction mode. At least the M4Us have a passive mode; your reply suggests that eg Bose QC15s can never be used as "normal" headphones in a headphone jack. 
 


I'm sure others with more knowledge will correct me if I'm too far off, but I believe that the active noise cancelling is a feature that was put on the cans to eliminate certain noises like those found on plane/bus/train rides; a certain frequency range. Normally one would not have a power amp/receiver with them whilst on a bus/plane/train.

 

I'm not sure what the NC does on the M4U 2...I don't listen to it in that mode, ever. I suspect it does amplify as well so I wouldn't recommend NC on while using your receiver. It , the NC, won't drown out your wife/husband/kids other household noises anyway, so why bother to use them in that mode in your home? I'm not sure about the QC15 as I don't have them and haven't read their specs, but aren't they an always on NC headphone?

 

I know I'd never use NC in my house, I'm not sure why anyone would. Please explain if I've mis-read your post or misunderstood the statement.

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