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Author Topic: AKG K550 Revisited - A WTF moment which may finally stop the arguing  (Read 11567 times)

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wildstar

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #20 on: July 18, 2013, 11:36:06 AM »

Earbuds are headphones too (K315)!
« Last Edit: July 18, 2013, 11:42:58 AM by wildstar »
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Solderdude

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #21 on: January 26, 2014, 10:30:52 AM »

Here is the K550 that was sent in for K551 modifications.



CSD...

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Solderdude

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #22 on: January 26, 2014, 09:28:05 PM »

With the mods as described in the K551 article:



I smuggled a bit and used 1/12th smoothing on this plot  ;)
More importantly it sounds excellent !
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funkmeister

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #23 on: January 28, 2014, 11:56:58 PM »

Wow... I guess driver matching has become less critical over at AKG. It doesn't look too bad but I still expected better.

The mods look great, though.
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Solderdude

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #24 on: February 04, 2014, 08:09:25 PM »

Got another K550 in.



AKG needs to work on their quality control  ::).
3dB level difference in the mids and the behaviour above 3kHz differs considerably.
The differences with this one are even bigger than those of my K551 and the other K550 that was sent in.

Will have to check if the differences between L and R in the mids aren't due to leakage of the cable entry in the left cup.  :-S
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CEE TEE

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #25 on: February 04, 2014, 08:54:57 PM »

^I have heard three pairs and two were more annoying in that area.  I'm going to spend some time with mine and consider doing the mods!
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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #26 on: February 05, 2014, 02:19:55 PM »

Modified !



This one came with a solid silver headphone cable (VERY microphonic and stiff)
It was open anyway to paly with the resistor values in the filter (22 Ohm in this one) so soldered (thin) copper wires to the drivers as well and routed them through the sheath and soldered a plug to it.
This way I could leave the headphone on the test rig and simply change the plug in the amp.
Results below:


This was the left stock driver, blue = silver wire, orange = copper wire,
The reason you see only one trace (the blue one) is because they measure the same.

(P.S. don't mind the Ohm scale on the right I forgot to remove it as it serves no purpose here)
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Deep Funk

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Re: AKG K550 Revisited - A WTF moment which may finally stop the arguing
« Reply #27 on: February 05, 2014, 03:21:34 PM »

The spike looks scary.
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