Looks pretty

About six months ago, I got my first OTL DAC and it has been life changing. I have a hard time not using my DAC. I also got some ATH-R70x headphones to go with it. I've run into a problem, though. Lately, I've been getting some really serious feedback from my headphones. I'm a little worried, and want to get some insight into what on earth could be going on with my Audio setup. I'm fine with replacing some of the pieces, but I'd rather know what I need to replace. On the flip side, I'm wondering what could have gone wrong with my setup in six months. 'Cause six months is too short for this problem, right?

Setup: I bought THX 789 for the massive output of idk 6W/32ohms, but whenever I try to use my Sundara/Modhouse Argon/HD600/Arya V2/...whatever, I cannot reach decent listening levels in terms of db without getting this scratching/hissing noise in the background ... I think it's distortion. (DAC I use: Geshelli labs - J2, set to max volume) Settings: With an XLR output, gain setting level at 2/3 and the volume knob set to 2-4 o'clock, hearing distortion from a 250-350$ THX amp shouldn't be a thing, should it? With somewhat hard to drive headphones, I'm not reaching 70db, but I can already hear this godforsaken noise on all tracks without a constant stream of sound. If you dare to up the volume past 4 o'clock, or past 12 on gain setting 3/3, this noise becomes so loud, it might as well be an additional instrument Music: The tracks I usually listen to involve so few instruments, that you don't have a constant stream of sound. (e.g. Creep - Lena Hall) I'd love to get some feedback!...

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How do you buy keyboards when youre in the eu? Because I live in the Netherlands and don't know how to order a keyboard

Though it's tiny, it manages to power even high ohm headsets with amazing accuracy. It works great with the drop usb-c to usb-c and my Phillips shp-9600. Soon enough I'll be using the Akoustyx...

I have an external amplifier with no integrated DAC and I only have an xduo xa10 as a dac/amp can I use the xduo xa10 as a dac only with an external amplifier?

PC38X just purchased, no sound from right side. Is this a common problem??