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Taking Koss Portapro to the Limit (cool mods). - Page 8

post #106 of 117

Which Grado's are those for? I've seen a couple of models and knockoffs looking around but that looks pretty good.

post #107 of 117
Quote:
Originally Posted by nonconvergent View Post
 

Which Grado's are those for? I've seen a couple of models and knockoffs looking around but that looks pretty good.

Those are the L Cush or Bowls, stock on the SR-225i's and up.

post #108 of 117

I tried sticking the Portapro drivers in the UR40 enclosure I had sitting around, mainly as a comfort improvement, and it improved both comfort and sound, IMO. Not a torture device to wear for long-term sessions, and I guess the treble is slightly softer because the drivers aren't right on top of my ears The foam that the UR40s originally came with lining the wire mesh side of the earcups was removed as well, in order to open them up a bit.

 

Plus the semi-exposed drivers as a result of the second mod look kinda cool as well.


Edited by HPuser9083 - 5/10/15 at 12:21am
post #109 of 117

Koss has actually stuck both Porta-Pro and KSC75 drivers into other full-sized cans enclosures and sold them under different models. I only discovered this by looking at the driver after I found broken models of each. This was more common for them to do in the 80s and 90s, I don't think they are doing this any more. Many of these models would be rebadged as Radio Shack brands.

 

But it would seem the actual Pros and KSCs are more popular since they are still marketed as current models.

post #110 of 117

My stock pads on porta pro's already got holes in them. Now im considering buying new ones I've read most of the posts about porta pro's seen a lot of different ear pads on them. I do understand that its a personal thing but is the best option to get out there: stock pads? pleather? senns or grado pads or any other? mabybe somebody can make a conclusion about all this :) ?

post #111 of 117
post #112 of 117

Hey guys, i want to recable my PPs (mainly because the stock cable FEELS cheap, especially compared to my se215's cable, which has a nice and sturdy feel). I'm looking for cheap cables, in the 10-20$ range. I'm ok with both pre-terminated cables and bare cables(not a problem for me to get and solder my own plugs).

 

Right now, i've found these two cables on lunashops: http://www.lunashops.com/goods.php?id=4325 and http://www.lunashops.com/goods.php?id=5102 (which i really like). Any suggestions for other cables?

 

 

Also, i was thinking of doing the kramer mod, but i'm having problems in detaching the black grille from the blue driver housing. I see the small slips that keep it locked to the housing, but i don't know how to detach it without damaging those clips.


Edited by Coldheart29 - 10/22/15 at 12:28pm
post #113 of 117

On Aliexpress and Banggood you can buy replacement cushios for the Portapro. It may be a bit silly question, but how do you secure these one on the headphone? I think you have to cut a hole in it?

post #114 of 117
Quote:
Originally Posted by Henery View Post
 

Recently i was looking for info about HD 800 ring radiator transducer.I found this blog: http://rinchoi.blogspot.fi/2013/01/sennheiser-hd800-part3-in-depth.html Then i wondered if hole in the diaphgram would work in PortaPro.First i cutted off some of that plastic grill.Then i pressed the middledome against the magnet with finger and cutted off the dome.This operation needed steady hands,patience and tweezer.

The results? Simply magnificent!!  Overall sound performance has improved significantly.Gone is that loose bass,somewhat veiled sound,lack of details and fuzzy imaging.

 

Here are my observations:

 

BASS:

What i noticed first after this mod was how tight and very well controlled bass became.I haven´t compared these with HE-500,but i think the bass tightness is propably on par with it.Bass is also quite textured aswell.

 

MIDS:

I have to admit that i´m not that good reviewing midrange.All i can say is that it sounds more detailed and thus,more realistic.

 

TREBLE:

At first i didn´t notice any difference in treble.After a while,improvements in resolution and speed started to get more noticeable.Treble is now much more refined and smoother.Not smooth like planar magnetics can be but not rough either.This modded PP is now more detailed than SRH 940 and HE-500 were ever,at least for me.I suggest to raise treble for about 2 db´s.

 

IMAGING:

Biggest surprise was the super precise imaging.First time ever i was able to locate individual instruments and hear previously unheard ambience information.Imaging was also quite out of your head (depending of recording) which is something i´m missing with HE-500.Instrument separation also became unbelievably good.

 

SOUNDSTAGE:

Soundstage grew noticeably.It is also airier than ever before.

 

TRANSIENTS:

Crisper,weightier and faster.For now i cant say much more.Need to listen more.

 

Did this mod make PP sound analytical like HD 800? No,absolutely not.That PP signature is retained.So you get fun and accuracy in same package.I have not detected any peaks on 5-6 khz region described in the link i posted above.So far this modification makes PP technically better than all the other above mentioned headphones.

 

I hope you will try this mod and share your observations.This mod surely works with all dynamic headphones.

I know this is very old post and is it possible to share some photos to se how it was done? I am keen to try this mod and not 100% sure if I understood correctly. Thank you. :)

post #115 of 117

 

This pair has small hole on the middle of the dome. You can see voicecoil more clearly through it.

 

 

This pair has the dome completely removed. That black block is piece of sorbothane. It is used to damp vibration resonances. Check this thread: http://www.head-fi.org/t/744839/damping-mechanical-energy-distortion-of-stax-and-other-phones-with-sorbothane-and-other-materials

post #116 of 117
Quote:
Originally Posted by Henery View Post

 



This pair has small hole on the middle of the dome. You can see voicecoil more clearly through it.




This pair has the dome completely removed. That black block is piece of sorbothane. It is used to damp vibration resonances. Check this thread: http://www.head-fi.org/t/744839/damping-mechanical-energy-distortion-of-stax-and-other-phones-with-sorbothane-and-other-materials

Thank you very much for the photos. To clarify, do you mean actually cut off the diaphragm on center? Please see attached image with blue square highlight on below.



I thought that sound does not come out or distort if the diaphragm is damaged. (I am newbie).
Edited by Decommo - 5/23/16 at 5:40pm
post #117 of 117
Quote:
 Thank you very much for the photos. To clarify, do you mean actually cut off the diaphragm on center? Please see attached image with blue square highlight on below.

Yes. Exactly that.

 

Quote:
I thought that sound does not come out or distort if the diaphragm is damaged. (I am newbie).

 It´s all good as long as you don´t damage voice coil.

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