I absolutely love my SZ2000, but they require a little tweaking related to your personal preferences. The 1st which is pretty much universally agreed upon is the stock pads they come with, they are way to shallow & just don’t fit right. I chose the Brainwavz angled memory foam pads, & i highly recommend these pads they are amazing. Next is the obvious burning in process. After that its on to choosing the amp/dac to be used with the SZ2000. An amp is an absolute MUST HAVE for these cans. This may take some experimenting & research is always a big help with this. It depends on what type of sound you are after, for me being pretty much only into rap music I’m after heavy bass. After trying a few amps I have found that the Fiio Q1 amp/dac is a very good fit. I also like the Topping NX1s amp but the Fiio gets a bit wider range for volume. Don’t always go for the high priced amps, as I tried the Denon DA-10 & was very disappointed. The bass was almost non existent and volume was way too low. with tthe Fiio Q1 & my Pioneer XDP100r the SZ2000 feel like I’m wearing subwoofers on my head. A lot of people prob can’t handle that much bass, but it suits me perfectly. As far as other frequencies I find they perform just fine, actually very well. There are some tracks which produce a sort of muddled sound but is easily fixed with a little adjusting in my XDP settings. I also highly recommend a hi-res music player in addition to your amp. Hopefully this all makes sense.
*** I would like to sell my Denon DA-10 amp/DAC as well as my V-Moda Crossfade 2 Wireless headphones. Both are brand new only been used very slightly. No damage whatsoever & no problems, just I have lots of other options that perform better for my listening purposes, so these both have just sat in the original box since the week they were delivered.