No, it's not that bad as many people make it out to be.
It seems to be about half and half - 50% of people like it, and 50% of people don't like it.
The sticking point is the treble (specifically a peak at 10k). They are quite bright (too bright for some people). In either situation, Comply (genuine or generics) foam tips are pretty much a given.
Even if you are in the camp that
don't like it, you can easily mod it to your liking in the following different ways:
- Folding over a small piece of foam in each nozzle (under the screen but on top of the BA drivers)
- Inserting a small piece of foam inside of each ear tip (above the screen)
- Doing the Slater foam mod to the BA nozzles
- Removing 1 of the BA drivers from the nozzle (done on a ZS5 v2 so far, but no reports yet of it being done on the ZS6 even enough they are very similar IEMs)
- Use EQ and cut 10k frequency to your liking (ie 5+dB)
#1 is completely reversible, and is very easy with the only tools needed a safety pin or sewing needle and a pair of tweezers. #1 is a 2/10 on a difficulty scale of 10.
#2 is completely reversible, requires zero tools or opening anything up at al. #2 is a 0/10 on a difficulty scale of 10.
#3 is completely reversible, and is very easy with the only tools needed a safety pin or sewing needle and a pair of tweezers. #3 is a 3/10 on a difficulty scale of 10.
#4 is permanent, and carries the largest risk of screwing something up. #4 is a 7/10 on a difficulty scale of 10.
#5 depends on the ability to adjust EQ with your source, and is a 0/10 on a difficulty scale of 10.
I personally love mine 100% as-is (using foam tips). I agree with HungryPanda - it's easily the best KZ IEM to date, factoring in build quality, sound, driveability, and looks.