The sz doesn't need any adding as it has 2 separate drivers.
It's tuning the early mids. The 2nd forward driver is for mids/highs.
There are folks who listen to classical with these. It has to be pointed out...3 things.
1 The Th600 were originally $1,200 the sz were $330
2 This thread was revived by me because I was looking for the hardest hitting bass can on the market and these were hanging on a rack in a Japanese shop. I was never told about these. These...despite my clear tastes were never mentioned by anyone.
3. I said A) You need an amp
B) You gotta love to use it (these cans come together at high volume/juice and not before)
C) You gotta have a Hip Hop heavy playlist
I am a basshead. What do folks think I'm recommending? I say again and again I wanna out slam anyone and their rig. I do and I do again and again. These will go deeper and get louder before distortion in the low end like no other can. Nobody ever told anyone these were audiophile cans. The opposite was said.
That's on you folks for thinking you could turn water into wine despite what folks before you said.
I'm not even conceding anything except that without proper tuning these are just hammers. A guy that listened to these for 5 hours total with some just basstronic **** is right. With 5 hours 18" subwoofers was the best he could do. I believe that.
I put more time in. I get more.
The 18" subwoofer effect is an eq slope on the low end with a gain boost. That takes 10 minutes. If you want a less impactfull bass hit you can pay 3 times as much for that with a proper tuned mids.