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Orthodynamic Roundup - Page 1605

post #24061 of 24070
Quote:
Originally Posted by ericj View Post
 

But speaking of AKG, do you recall that AKG patented some really interesting orthos that never got produced? 

 

They made very clear in the K1000 brochure currently available on wiki that ortho designs with neo magnets were bound to fail in their opinion due to excessive weight. It's equally clear to me that they were entirely right when I see +500g neo-orthos(and up to 650g lol) without a double headband which would be a major no-go to me, it's only now that they are finally using proper HP1'esque headbands with the HE400i/HE560 duh. OTOH, Oppo prefered to build a highly effective dual-sided diaphragm and the weight of the PM3 is in the 350g region IIRC.


Edited by leeperry - 6/30/15 at 1:01pm
post #24062 of 24070

Yup 327g if I recall correctly for the PM-3.  Which is now on sale a lot cheaper now ( all models )= like-new refurbs with all accessories and warranty even which should drive second hand prices lower, unless second had has a warranty which I doubt. Second hand is more like a hand wave warranty...

 

over a LB of weight is a bit much.

 

FWIW PM-2 refurb is $200 off

 

++++ OWW how did I miss the last few posts.

 Master Nomax is at it again, been wondering what he has been on about lately. Will see I guess soon.

 

16 ohms, also why would anyone put that on a shell. Photoshop joke maybe. The headband assembly looks rather primitive for an AKG production.


Edited by nick n - 6/30/15 at 1:52pm
post #24063 of 24070
Quote:
Originally Posted by leeperry View Post
 

 

They made very clear in the K1000 brochure currently available on wiki that ortho designs with neo magnets were bound to fail in their opinion due to excessive weight. It's equally clear to me that they were entirely right when I see +500g neo-orthos(and up to 650g lol) without a double headband which would be a major no-go to me, it's only now that they are finally using proper HP1'esque headbands with the HE400i/HE560 duh. OTOH, Oppo prefered to build a highly effective dual-sided diaphragm and the weight of the PM3 is in the 350g region IIRC.

 

Nonsense. The T50RP only weighs 330g. 

 

There are plenty of dynamic headphones heavier than that, including the TH900 at 400g. 


Edited by ericj - 6/30/15 at 7:11pm
post #24064 of 24070

^ Your document was released in 1979, remember? Anyway, check the K100 brochure and see why they decided to give up on orthos. I am not impressed by the T50RP to the least and it's pretty obvious that the larger the diameter of an ortho driver the "thicker" and more life-like it will sound IME. There's a good reason why the latest russian orthos are 80mm IMO.

post #24065 of 24070
Quote:
Originally Posted by leeperry View Post
 

^ Your document was released in 1979, remember? Anyway, check the K100 brochure and see why they decided to give up on orthos. I am not impressed by the T50RP to the least and it's pretty obvious that the larger the diameter of an ortho driver the "thicker" and more life-like it will sound IME. There's a good reason why the latest russian orthos are 80mm IMO.

 

Document? 

 

I never spent much time with the T50RP myself. 

 

And i don't really care why AKG gave up on orthos. Different engineering organizations go different ways for different reasons that aren't necessarily solid. 

post #24066 of 24070

I have just found (and obviously bought) a Peerless PMB 80, NOS (sealed box). I am surprised by the clear sound (though weak bass) of this headphone.  Just one thing:  it seems that time has aged the bonding of the pad edges (white velour). I understand there is no original pads for the PMB 80 now.  Does anyone here know which pads could fit in? Thanks.


Edited by zeroduke - Yesterday at 8:02 am
post #24067 of 24070

Open them and check if foam has deteriorated, it gets pretty bad and go inside the drivers.

post #24068 of 24070
Foam seems to be ok.
post #24069 of 24070
Quote:
Originally Posted by MuZo2 View Post
  Akwpa-Skj2.jpgEyuiOL-8ff.jpg

Open them and check if foam has deteriorated, it gets pretty bad and go inside the drivers.

 

What would you suggest to replace them?

post #24070 of 24070

If you like current sound just replace it with any open cell foam. You can also try felt or cotton or combination.

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