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Old 13th January 2020, 09:58 AM   #51
paczeltf is offline paczeltf  Hungary
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Join Date: Jan 2018
Location: Budapest
Originally Posted by Wansmith View Post
...I know many people use the tu8200 as a headphone amp for lower impedance headphones such as the hifiman or mrspeakers planars. It would be good to know whether Elekit believes there is something missing or flawed in paczeltf’s analysis & suggestion
Well, I don't really understand how my analysis can be flawed unless the schematics in the respective manuals are incorrect for the output section, which is very unlikely.

...or whether Elekit believes it is a good change to make for people with lower impedance headphones (eg hifiman 1000, which has flat 34 ohm impedance per these measurements
It is hard to predict how a particular set of headphones will react to driving impedance that is close or even higher than the nominal load impedance.

I acquired a Focal Clear a few weeks back. If you look at various online reviews then you will see that driving these phones from OTL and other high impedance sources is not recommended due to the upper bass hump it causes.

What I can tell you is that the Clear sounds awful with the stock TU-8200 until you bypassed the parallel 180 Ohm resistors. It is not just about the bass that gets bloated, but also the treble becomes veiled and the dynamics suffer.

Unfortunately, connecting the phones directly to the speaker output has a couple of drawbacks. First, the the background noise and hum will significantly increase. Second, the risk of damaging your phones as well as your hearing is much higher. I suspect Elekit implemented these resistors for protection but it does not come without a cost.

The 8200R has adjustable output level so if you install a pair of let's say 3.3 Ohm/1W resistors instead of 220 Ohms, you should be fine with lower impedance phones. Modifying the original model is a bit more complicated and I haven't done it yet as I am not sure if I will keep these headphones.
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