It’s not what I would call overemphasized, it’s very clean and keeps its distance from the rest of the FR. Excellent detail with a good rumble but not too much as to make it sound dark or muddy.

Haven’t had an issue with driver failures, the cable does have a very flimsy mmcx connection. One IEM may be more loose on one side than the other but you just have to press into the connection from the IEM to get a better seal, I do that and I never have problems with audio cutting out.

But if the mmcx port is too weak, Sennheiser will almost always just ship you a new pair if you send it to them.

The IEMs themselves are built excellently and connect just fine. And they sound phenomenal, definitely worth having to deal with fiddly cables every now and again.

M1 MacBooks should be plenty powerful for the 660s, they are quite efficient

Ngl, I keep an iPod touch 6th gen as my dedicated music player for outdoors. Connect it to my phones hotspot when I want internet. Still a surprisingly usable nugget in 2023

The HD 540 reference I sounds better to me than the HD 600, better staging and separation.

tape mod and tip rolling is too much effort

First world problems lmao. Bro adding a piece of tape to a nozzle takes less than a minute, wym too much effort?

tape mod and tip rolling is too much effort First world problems lmao

Ok this is getting a little scary

You don’t really need it imo, you already have great 600 series headphones, and the hd 600 is just a more refined 650/6xx. So unless you wanna complete the collection, it’s not worth

660s is better technically speaking better sense of separation and imaging than the 650. If you want 650 bass but more controlled, you could always just EQ

Spicy pillow moment

The plastics on them are lower quality than even the new 600’s, all to get that $200 price tag