[GREQ]

 

  The peerless U70 drivers themselves have A LOT of potential IMO - just NOT in the U70 shell. 
When I held naked the drivers against my ears, they sounded really quite good. 

Well, agree with the first part - bought four of them just for drivers, made custom wooden shells etc. But one u70 remained, and I know what's the main problem with this - driver is totally closed and just needs some air - simple overdamping, there is even thick felt here already, two discs on each driver. Basically, few holes around perimeter, under aluminium cover, can make those sing. And new earpads, of course. Will post some pictures soon.

Hmm.... I also tried the U70 out with new pleather earpads and just left the aluminium backs off (stuck the drivers down with a bit of tack around the edges) and it didn't sound so good to me. More airy, yes... but nothing worthy of praise.
I also tried out some light damping with open backs, but no good came of it. I'm interested to see what you came up with - they're ridiculously easy to mod, so I might try something out inspired by your work.

 

[ballhead]

 they're ridiculously easy to mod

just some persistence needed
and I meant real leather memory foam earpads, with soft felt inside.

 

[GREQ]

 

 they're ridiculously easy to mod

just some persistence needed
and I meant real leather memory foam earpads, with soft felt inside.

*drool* I gotta see that!

 

[ballhead]

wait couple of days, little busy now. will show how to do those earpads too.

 

[BucketInABucket]

Spoiler: So, I've been playing with damping schemes for my RE-257 with TDS-5 drivers and eventually came up with this.

Sealed the driver to the baffle using blu-tak.
Replaced the dynamat with paxmate to fill the hole in the back of the cup.
Put a circle of Arctic Cotton (thanks Nick N) on top of the paxmate.
Put a merino wool felt donut on top of the AC.
Cut out part of the baffle. (I lost some of the screws)

Overall improvements:
Less muffled sound and more airy-sounding.
Tighter bass and more of it.
 
So now it's pretty much a semi-open-back pair of headphones 

 

 

[bootdsc]

 
Well, agree with the first part - bought four of them just for drivers, made custom wooden shells etc. But one u70 remained, and I know what's the main problem with this - driver is totally closed and just needs some air - simple overdamping, there is even thick felt here already, two discs on each driver. Basically, few holes around perimeter, under aluminium cover, can make those sing. And new earpads, of course. Will post some pictures soon.

 

  just some persistence needed
and I meant real leather memory foam earpads, with soft felt inside.

I would like to see these custom wood hp's. How about a couple pictures of the leather pads too.

 

[nick n]

Originally Posted by BucketInABucket 
 
  Sealed the driver to the baffle using blu-tak.
  Replaced the dynamat with paxmate to fill the hole in the back of the cup.
  Put a circle of Arctic Cotton (thanks Nick N) on top of the paxmate.
  Put a merino wool felt donut on top of the AC.
Cut out part of the baffle. (I lost some of the screws)


Overall improvements:
Less muffled sound and more airy-sounding.
Tighter bass and more of it.
 
So now it's pretty much a semi-open-back pair of headphones 

 
 
If you are playing around with materials don't forget to hold them up to a light and look through them. It's fun. Blowing through them also ..just don't let people see you in stores doing that/. Makes me want to look into some of that style also.

 

[ballhead]

   
I would like to see these custom wood hp's. How about a couple pictures of the leather pads too.

few pages back, post #22802

 

[bootdsc]

  few pages back, post #22802

Ah yes i did see that, really nice work. Hadn't noticed who the poster was at the time. Any plans to make more?

 

[ballhead]

U70 mod
 

 

[ballhead]

U70 mod making of
 

 

 

 

 

 

 

 

 

[MDR30]

Does the box say made in Denmark or made in Germany?

 

[MDR30]

Is that brown blutak? You also mentioned holes to make the drivers breathe, would be interesting to know where you put them. In my U70, the damping felt was circular, not square, and I think only one each of them. Ear pads look like a perfect solution, not to thick, not airtight, and with a controlled central opening (not too large, causing cavity resonances).

So how do they sound?

 

[MuZo2]

He made holes on side walls of shell, similar to YH100.
 

 

[DefectiveAudioComponent]

Does the box say made in Denmark or made in Germany?

 
They were still made in Germany. Available in red, olive, and black.