The HD520ii has been discontinued for years. It was my first real "audiophile" headphone, back in the mid-90s. It has amazing highs and air, but thin bass. Still, I love it. The HD600 is a more well-rounded headphone and it's great as a standard reference, but it's not my favorite.

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AliExpress takes forever. I bought them from LINSOUL and they were at my door in 9 days.

Just to be clear, when you say detail on the P1 is "on a very different level" than the ZAX, do you mean a LOWER or HIGHER level? To my ear, detail on the ZAX is comparable to my reference headphone, the Stax L700. Yeah, that sounds ridiculous, but yeah. Also, it sounds like you're saying the P1...

I used to have the Koss Plug. Not good.

I'm sure the KSC75 is quite good for the price. Koss is like that. I'm a long-time fan. I will say that the Koss KPH30i is amazing.

While I'm at it, I might as well rattle off my headphones, too: Koss A130, Sennheiser HD520-ii, Sennheiser HD598, Sennheiser HD518, Shure SRH840, Monoprice 8323, Sennheiser HD202, Grado SR80e, Sennheiser HD600, Bang & Olufsen H6, OPPO PM-3, Audio-Technica ATH-MSR7, Sennheiser Momentum On-Ear...

Well here's most of them. There are plenty more that I didn't record. Sony MDR-EX70, JVC HA-FX66, Panasonic RP-TCM125w, Panasonic IEM, Panasonic ErgoFit RP-HJE120-g, V-Moda Vibe, V-Moda IEM, Creative Labs E-630, Altec-Lansing IEM, Ultimate Ears MetroFi 150v , Apple earbuds, Klipsch Image S4i...

I just got the ZAX and I am mightily impressed. I had been considering the Tin P1, but after listening to the ZAX, I can't imagine the P1 being better. I should say that I also bought the Tin T2 Pro and hated it (something about the treble), so maybe Tin's tuning isn't for me. What do you think...

Just got the new KZ ZAX. I've spent more than a decade searching for the perfect sound in an earphone. This is the 64th earphone (and 13th KZ earphone) in my IEM collection. By far the best I've ever heard. I think I'll stop now. I am finally satisfied.

I'm a new Stax owner and I certainly want to protect this investment. I've heard that due to the open design and the ultra-thin membrane of the speaker, Stax are extremely sensitive to dust. So much so that they should always be covered or stored away when not in use (rather than on a headphone...

I don't know how to tell. I have four ZS5's, and they all sound the same.

I just got my ZS10 today. My first impression: it's probably the best earphone I've ever heard. And I have had a lot. My favorite had been the ZS5 (more than the ZS6, which I find harsh at the high end). Better than my OneMore Triple, Ultimate Ears Super.fi 5 Pro, FiiO EX-1, Shures, Klipsch...

  The Audio-Technica MSR7 was another big disappointment. Again, I had high expectations for it, based on lots of great reviews online. But when I opened the box and put them on, I knew within seconds that they were not for me. I was almost angry at being duped by all those reviews. The MSR7...

I was greatly disappointed with the X2, especially with all the rave reviews across the internet audio community.    My initial impression: The X2 is super comfortable. The overall sound is generally warm and inoffensive. But with a little more listening, the weaknesses become more apparent...