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Joined in June 2019, the volume from both low impedance output and high impedance output are exactly the same. Used a couple of not too hard to drive headphone to test my theory. Anybody else have run into this issue here?
How did you determine the sameness of the outputs?
This amp is interesting in how varied the reactions to it are. Some say there are distinct differences other say there is a small difference. Some say it has a good bass response others say it just ain't there. I recommend reading through the SBAF thread on this to get a perspective. I hear a difference but I agree that it's not as distinct as say my THX amp. But I wouldn't worry about it. My ZDT Jr. drives my HD6xx just fine and so I am happy.
I don't have any technical measurement equipment, but I'm lucky enough to have two standard Fostex th900 (MK I & MK II), which are the same headphone with and without removable cables.
It could be that I went into this with the wrong expectation, and I'm still burning the tubes for what I think could just be impurities, while I'm not commenting on the sound characteristics of the high and low impedance outputs, just the loudness of them, but like you said there must have be very few dBs of difference between them.
Curious as to what kind of headphone you plan to use with this amp?
By the looks of it, right now it would be mainly the HD800s and He1000s, mainly due to some audible distortions on my unit on the right channel(I've also read what you wrote on the other thread.) Listening at 120 db, they are more apparent for headphones require less power and almost inaudible on more power consuming ones
I can't afford HD800's;-) But reading the SBAF thread this is the amp for them at least most people concede. I don't own any planars but from what I've read(SBAF) this is not the amp for them. Not sure why you would have distortions on just the right channel perhaps your source.
The point I wanted to make was this amp prefers high impedance Dynamics like the Sennheisers. I also use a pair of Grados which are 32 ohm but sound great. I used them to verify that there was a difference between the outputs. So the output volume between the two outputs doesn't bother me. And if you use low impedance phones they should sound fine at least they do for me. I wouldn't try IEMs they're much too sensitive.
I did audit the amp on different dacs and interconnects. Usually the volume control is in the input of an amp in which the volume nob control the amount of signal going into the amplification circuit(except maybe the master 9.) And the distortion that I've got here are independent of the volume, which let me to want to rule out the source as an issue. You are probably also right on the planar question, ZDT Jr have enough voltage needed for high impedance, but may not have enough current, which becomes apparent when I briefly run HE6 out of the amp, everything kinda gets pushed into middle, less separation. But imp, if a planar is efficient enough like the HE1000se, which only need about 85 mA to have a moderate listen level, could still be quite fun, if the listener is not too extremely detail oriented. On the output volume question, I think I misunderstood the meaning the "Gain: 12dB" in the Spec.
I recommend the SBAF thread I learned a lot from it. Took me a while to really like the ZDT Jr. but now it's my favorite. I have the CTH LCX & THX and like them all. The LCX I find works best with IEMs in balanced mode. The THX is revealing and power plus but as they like to say sterile, I still enjoy it. Love the CTH & HD6XX great sound but not as clean and detailed as the ZDT Jr. .
Hmm I thought it was just me, when trying out my HD6xx i barely have to turn the knob up at all before i'm at listening levels. Thought it was inexperience with tube amps.
Yep, both outputs have a gain of 12 dB, the difference, I think, are different voltage and current to drive different headphones.