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[GUIDE] Balanced AKG K702 with detachable 4-pin mini-XLR cable - Page 3

post #31 of 60
Ahhhh, I understand. So I need to test every connection while shooting power threw 1 conductor to ensure the others are separate
post #32 of 60

Yes there are many ways you can accidently short pins while making a cable.

 

The easy way to test it is to plug the cable into the headphone, and then test the continuity between the "pins" on the TRS connector. It should look something like this:

 

TRS+jack.jpg

 

Between TIP and RING ~120 Ohms

 

Between TIP and SLEEVE ~60 Ohms

 

Between RING and SLEEVE ~60 Ohms

 

If one of those shows 0 Ohms, you have a short. If one of those is infinity, you have an open circuit.

 

Have fun. beerchug.gif

post #33 of 60

Seeing as you replaced the cable for balanced use, does it not matter that the ricght driver will have a longer cable due to the fact that it's a onesided output?  If you were to rewire the phones with a better quality cable either cardas or silver or something, then would it be necessary to also rewire from the input jack to the left and the right cups?  I hope that makes sense lol, I'm planning on buying a pair of the q701's which have a similar setup and would like to experiment with some different cable setups for it!

 

Thanks!

post #34 of 60

Well, if you believe dual entry is inherently better, then you'll probably hear a difference. Otherwise, no, it's not a problem. 

 

The main advantages of balanced cabling are still there, even if one side goes trough the headband. It would, in theory, raise the impedance of the cable for this driver. In practice, I bet the difference would be smaller than the variance in impedance due to soldering. In other words, you may find the same variance even in a dual entry cable, simply because the solder joints are not perfect and introduce resistance which may be different from one to the next.

post #35 of 60

Just to make sure that I understand what you're saying: So even if I wanted to upgrade to a silver cable, on a single entry style headphone, rewiring from entry point to the other driver wouldn't be necessary?  Wouldn't that change the sound from source to far cup due to the different cables?  I am quite naive when it comes to recabling, so I just want to make sure that I do it right :)

post #36 of 60
Quote:
Originally Posted by szwety View Post

Just to make sure that I understand what you're saying: So even if I wanted to upgrade to a silver cable, on a single entry style headphone, rewiring from entry point to the other driver wouldn't be necessary?  Wouldn't that change the sound from source to far cup due to the different cables?  I am quite naive when it comes to recabling, so I just want to make sure that I do it right smily_headphones1.gif

In theory the advantage of dual entry is that you avoid the wire through the headband that MIT be low quality. In truth, that wire is small, and is pretty good quality on most headphones, that it doesn't really matter.

I have a balanced Q701, single entry, sounds great. Balancing a headphone simply is separating the grounds, so you can have inverse signals.
post #37 of 60

Though with AKG headphone, it is interesting. The two metal rods making the headband are used to carry signal from one cup to the other. These rods are probably made of a metal alloy chosen for its physical properties, not electrical ones. Then there are small wires soldered to the ends of the rods. So in practice, the right driver's signal has to go trough 4 additional solder joints and long metal rods. It may be interesting to measure the total impedance of this system. It may be significant. 

post #38 of 60
Quote:
Originally Posted by KimLaroux View Post

Though with AKG headphone, it is interesting. The two metal rods making the headband are used to carry signal from one cup to the other. These rods are probably made of a metal alloy chosen for its physical properties, not electrical ones. Then there are small wires soldered to the ends of the rods. So in practice, the right driver's signal has to go trough 4 additional solder joints and long metal rods. It may be interesting to measure the total impedance of this system. It may be significant. 


I thought there is a wire straight from the left driver to the right driver, no intermediate wire/pole. I could be wrong though

post #39 of 60

Skip to 2:41 and then 4:20.

 

post #40 of 60
Quote:
Originally Posted by KimLaroux View Post

Skip to 2:41 and then 4:20.

 


I stand corrected! Thanks! I didn't know that. Cool vid, too :D.

post #41 of 60

It looks silver in that pic, atleast its not OFC :)

post #42 of 60

yea don't think the metal rods could be that much of a problem or there would already be significant left/right imbalance in the sound right? AKG probably considered that?? confused.gif
 

just got my k702 annies... considering a possible future with balanced biggrin.gif


Edited by joebobbilly - 5/25/13 at 9:08pm
post #43 of 60

I am not sure it is fully balanced when you only have one cable coming out of one side~~~

I think a Y split will be a better idea here cause different length and material of the wire will lead to different resistance. If you care that much to turn the AKG into a balance setup, the last thing you will want is the channel imbalance caused by different wire resistance.

 

P.S.

The cable looks very nice!

post #44 of 60
Quote:
Originally Posted by AlanHell View Post

I am not sure it is fully balanced when you only have one cable coming out of one side~~~

I think a Y split will be a better idea here cause different length and material of the wire will lead to different resistance. If you care that much to turn the AKG into a balance setup, the last thing you will want is the channel imbalance caused by different wire resistance.

 

P.S.

The cable looks very nice!

 

But how would you get it to Y split?, you'd have to drill a hole on the right side no? or would you order another left piece enclosure and hope it fits on the right side? can you even order that part? if so... where???? =)

 

P.S. if going with a Y split would you have to somehow disconnect the connecting rods? wouldn't it possibly cause short circuit? Sorry if these are stupid questions... i'm a noob... not an electrical engineer


Edited by joebobbilly - 5/30/13 at 11:46am
post #45 of 60
Thread Starter 

I think the cups are interchangeable, so you could probably put the left cup with the 3-pin mini-XLR onto the right side and do a y-split.

 

As for where to order the cups, I think I just went to their website and found a number to call. There's no online store for parts AFAIK. There's also the service manual with the part numbers somewhere but I forget where I found that. This was all a couple years ago...

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