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[GUIDE] Balanced AKG K702 with detachable 4-pin mini-XLR cable - Page 4

post #46 of 60

I read, some time ago, that people who converted their K701 into dual-entry bought a Right cup to replace the Left one. Then they drilled a hole in the center of each cup.

 

You can't really buy a Left cup to replace the Right one because the stock cable entry isn't centered. This would place the Right cable entry at the back while the Left one is at the front. Ugly.

 

But anyways. As I said earlier, converting an AKG phone to dual-entry is overkill. You still get all the advantages of balanced operations even with a single entry. It's a nice project, though.

post #47 of 60
Thread Starter 

Ah that's true, it would indeed point to the back once you put the left cup on the right. Definitely agreed that dual-entry is overkill.

post #48 of 60

The term "balanced audio" really refers to two effects that both benefit sound quality. Most of us think of differential signaling--running an  in-phase and out-of-phase signal for each stereo channel--when we think of balanced operation. But you can get common mode noise rejection without differential signaling as long as the two + and - wires are of equal length, gauge and their impedance matche. Note "equal length" refers to the individual wires in a channel pair so the extra length of the right channel wires will not cause an "imbalance."

 

I'm hoping to do this balance mod to my AKG K240 Studios.


Edited by robrob - 9/1/14 at 4:36am
post #49 of 60
I'm about to complete this mod myself. When I go to press out the existing jack, I'm a little unclear which direction to press the jack out. Down through the end where the female is inserted or up back into the headphone?
post #50 of 60

It comes out from the wire side. These are my K240s after I pressed the old 3-pin plug out:

 

 

 

My detailed how-to is here: http://robrobinette.com/HeadphoneMods.htm#K240 Balanced Mod


Edited by robrob - 9/1/14 at 4:35am
post #51 of 60
Thanks! I'm going to tackle this tomorrow. Can't wait to get these going on my Mjolnir!
post #52 of 60
Ok, so I finally finished this mod.

Outstanding instructions and assistance was provided through this thread. Since this was my first mod, and first time soldering for that matter, here's my take on the whole thing...

First, make sure you put all the necessary sleeves and heat shrink on your cable before soldering it. I always wondered how this happened but I found out the hard way....

Second, mini XLRs are a pain in the ***** to work with. They are called mini for a reason!

Third, after beating on the old 3 pin XLR found in the headphones, I looked for alternatives around the house. I used a $1.99 spring-loaded center punch and it came out in one shot.

I am very proud of my work and thank this thread for giving me the confidence to take this on.

Oh, and did I mention that the mini XLRs are a pain in the ***** to work with?

post #53 of 60
Quote:
Originally Posted by zabzaf View Post

Ok, so I finally finished this mod.

Outstanding instructions and assistance was provided through this thread. Since this was my first mod, and first time soldering for that matter, here's my take on the whole thing...

First, make sure you put all the necessary sleeves and heat shrink on your cable before soldering it. I always wondered how this happened but I found out the hard way....

Second, mini XLRs are a pain in the ***** to work with. They are called mini for a reason!

Third, after beating on the old 3 pin XLR found in the headphones, I looked for alternatives around the house. I used a $1.99 spring-loaded center punch and it came out in one shot.

I am very proud of my work and thank this thread for giving me the confidence to take this on.

Oh, and did I mention that the mini XLRs are a pain in the ***** to work with?

 

 

 

 

:beerchug:

 

Congrats on a successful mod! Any comments on the K702 w/ Mjolnir? I've been hunting for a balanced amp for a year now, and I've always been tempted by that beast, but worried about that treble. 

post #54 of 60
There's a lot of treble, no doubt. I'll have to reserve judgement at this time. I am a believer in burn in and I think these cans need some time, they probably had about 1 hour on them before the mod. I'm burning them in as we speak. I'll report back.

My other set of cans are HE-500s and they sound awesome on Mjolnir.
post #55 of 60

so i'm working on this  mod for my k7xx. i'm concurrently recabling a pair of practically new grado sr60 that i picked up for $20 on craigslist because one channel was not working.

 

anyway, for those who know how to open the grado cups to access the drivers, it's usually done by applying heat to the cups using a hairdryer. this softens the glue and then the cups can be twisted and pulled apart. i opened my grados and thought this might work for the k7xx...so after opening the grill an getting to the actual connector part, i used the hairdryer for a couple minutes to heat up the connector. sure enough, i pressed on the inner part a bit with a screwdriver and it started to slide out. after the piece was out about a quarter inch, i grabbed that part with some pliers and was able to twist the rest of it out with very minimal force. as you can see in the picture, the wire end has some glue residue that holds the piece in...that's what needed to be heated so that it could be extricated with minimal force. hope this helps anyone who's attempting this mod. 

 

just have to get my cable all wound and sheathed and hopefully will have everything done later this weekend...

 

post #56 of 60
Quote:
Originally Posted by kugino View Post
 

so i'm working on this  mod for my k7xx.........................................................

i used the hairdryer for a couple minutes to heat up the connector. sure enough, i pressed on the inner part a bit with a screwdriver and it started to slide out. ..........................................................

 

Hey kujino

 

Thanks for the tip, planning on doing my K712s, thought that might work but just wasn't totally sure, although it may be easier to pop the 3 pin xlr while the holder is still in the socket?

Debating if I'll even use a mini xlr or just hard-wire everything, always my preference when possible.


Edited by Rob80b - 3/17/15 at 3:37pm
post #57 of 60
Quote:
Originally Posted by Rob80b View Post
 

Hey kujino

 

Thanks for the tip, planning on doing my K712s, thought that might work but just wasn't totally sure.

Debating if I'll even use a mini xlr or just hard-wire everything, always my preference when possible.


cool. let us know how it goes. yeah, after i did it i wondered why i didn't just hardwire it...but i guess it's nice to have the option of switching cables, though these cables aren't readily available - you'll have to make them. i suppose if/when i sell these people might prefer a detachable cable anyway.

 

oh, one other thing i had to do with the mini xlr (and which might sway you to hardwire it)...i had to cut off part of it to make it shorter, so i hacksawed a part of it off so that it would fit inside the cup. 

post #58 of 60

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 85


My previous K701s cable already had 4 leads so it was a no brainer configuring for balanced.....and hard-wired at that.;)

post #59 of 60
Quote:
Originally Posted by Rob80b View Post
 

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 85


My previous K701s cable already had 4 leads so it was a no brainer configuring for balanced.....and hard-wired at that.;)


cool. i didn't know the k701 had four wires in the cable. i modded a k501 to dual entry and balanced and the cable had only three wires (like the k7xx) so it had to be recabled, desoldered inside the cup, etc...aah, i miss my k501. those were some good headphones.

post #60 of 60
Quote:
Originally Posted by kugino View Post
 


............................... i modded a k501 to dual entry and balanced and the cable had only three wires (like the k7xx) so it had to be recabled, desoldered inside the cup, etc...aah, i miss my k501. those were some good headphones.

Re-cabled mine also "way back when"......but  only singe ended...balanced amps were rare, but give em enough power.......

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