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Post by Aristrotle on Jan 28, 2019 8:45:25 GMT
There are some rumors that using Outer headband compl.(referring to AKG's service manual) as jumper wire to transfer signals could have bad influence in sound quality. I didn't take it seriously untill I found a strange regularity in AKG's 7 series headphone measurements —— there are always a higher 9khz peak and a lower 16khz notch to be found at right channel, like this: Such characteristic can be seen in K701, K702, K712 and Q701 across RTINGS, InnerFidelity and GoldenEars' measurements. Therefore I cannot say it's just channel mismatching. Then the rumor was caught in my mind. It would make a lot of sense since they share the same design and have the same issue. But I'm not knowledgeable enough to explicate the basis under it. Also I didn't hear this issue in general listening experience before and after I knew this issue existing except listening to swept-frequency signals. I won't be bothered while enjoying my K702, but still in curiosity.
What do you think?
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solderdude
Administrator
measureutternutter
Posts: 4,882
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Post by solderdude on Jan 28, 2019 10:18:47 GMT
The rods indeed carry the currents to the right driver. It's the same as with Superlux headphones.
These rods are very thick and have a much lower capacitance and resistance than any wire one could use between the 2 drivers. The rods therefore are MUCH better than any wires in all aspects.
They don't influence the sound in any way. I have measured the rods of Superlux quite a few years ago. DC to 1MHz (can't measure higher) and virtually no resistance at all. BUT poor soldering (a high temp is needed to heat the rods enough for solder to adhere) can cause problems with righ drivers cutting out. At least this is so with Superlux headphones.
There are other differences between left and right cup though. The left cup has some space in the cup taken up by the connector but reckon the difference is too small and driver differences will be bigger. Certainly not at higher frequencies.
Also some HATS have slightly different Pinnae on the rigs for left and right. The reason for this is that humans also have different Pinnae left and right. This is in the frequency range where the Pinnae have the most influence. That may be the reason why this is so with HATS measurements. The Pinnae aren't just mirrored as far as I know.
The biggest issue with the AKG's is the 2kHz peak which makes them too forward and the bass roll-off as well as the treble peaks. K712 less so.
The rods aren't the problem in any case. Welll .. they do 'resonate' when you tap them and can hear that but this is of no electrical consequence.
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Post by Aristrotle on Jan 28, 2019 10:51:56 GMT
These are solid answers! The stone in my heart has landed (I would worry no more).
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