Yeah Hifiman is a bit ridiculous when it comes to pad mounting. Also I Sundara Closed is on huge discount from Hifiman store now, probably didn’t sell well.

Which also explains why other companies doesn’t want to make pads for it.

On head-fi there is a guy that swear by EF400 pairing with HE6v2se.

While I haven’t look at the spec of EF600, I’m going to assume if EF400 can drive HE6v2se then most likely EF600 will do just fine.

Yeah I do think preference probably play a part too but… from what I gathered it sounds like most people prefer:

HD600 = HD650 (HD6XX) > HD660S > HD58X

I put HD600 = HD650 meaning they re equal but depending on taste/preference.

So based on what you said it sounds like HD660S2 is better than all of the above. HD660S2 normally are also like 2-3 times the price so maybe it’s a hard sell.

But it might still good as something to bridge the gap between HD600/HD650 all the way to HD800S.

EDIT: Not sure where HD560S sits on this scale.

How’s the HD660S2?

I remember before it came out there was this hugeeeeeee hype that it addressed all the shortcoming of previous 600 series headphones and it’s suppose to be the best 600 series Sennheiser.

Then after it comes out and no one ever talked about it again. Was it just the price proposition is bad?

Since you can get 6XX for about $200 or so and almost as good.