Another idea for you. Elfidelity AXF-100 ULTRA III USB isolator. I use an external linear power supply to drive it. It isolates it from the internals of your PC.

I have herd nothing but good things on the RAG2. It will drive anything you throw at it except eSTATS. I forgot it was on sale. It's a steel. Throw the DAC chip in it and your good till you find away to a stand alone DAC. I will just throw this in. I did not understand how critical a DAC...

I use Stereotool as part of my dsp output with Musicbee. Love it.

I concurr on this. I use my tower PC as my mutlimedia hub in my cave. For my HP system, the pc feeds a Yggy LIM that has it's output switched between a Jot2 (for everyday use) and my Audiovalve tube amp for high end use. The Jot2 sounds very good with my DC Ether Flow C's and Senn 900s. The yggy...

Does it show up in windows device manager?

Back in the day I used MusicMonkey to manage my iPOD.

I'm very much liking what I see here. A portable player with "tube sound" sounds wonderful. I don't stream and if I am using BT, it's via the phone. That said, I have not used a Cayin DAP, so those who have past experience, how good/bad is their I/O interface and library managing? I have a...

It stays digital untill getting to the speaker/HP/speaker. That expensive DAC chip and Amp in a DAP becomes useless as it is bypassed.

Parts Express. Search subwoofer kits. They got a couple 6.5" units. Make it any color you want.

If it worked for you, and if you get any power supply buzz, you can find linear power supplies to feed it to replace the wort. My pc's usb card which is designed to isolate it from the PC has an external power supply feed port. I found a linear supply to feed it. Worked well.

Go to the book store and search for a usb c powered laptop hub. You want one that has the usb c data cable to plug into the phone. It needs to have a wallwart power supply to drive the DAC. Like this: Powered USB Hub, Rosonway 7-Port USB 3.2/USB C Hub

If your going that route with a dac/amp and just need transport, I'd look at the mid-level players. You don't need the cost associated with DAC chips or high-output amps. Look low to mid-grade with people who state the operating system is easy to manage your library. For increased storage you...

And remember, WAV files do not have a consistent format for tagging the file info for your DAP or PC software to read. I'd stick with FLAC if you are going to have a large lossless library that can be managed. Some claim they do but the inconsistencies and lack of standards mean for all...

Lov'in me some Frank with his SG! https://www.facebook.com/watch/?v=1782657028501249

I cannot speak to the valve causing an issue should it go bad. I have not had one go out yet. The "noise" you are experiencing between the 2 HP's is due to a difference in the impedance between them. Adjust your gain.