If 660 can use the Beyer/AT pads, then I assume 330 can?

HD660 has became one of my main poison tool since i got the AD300, likable by many people, but not my taste for personal reason 

I do, but only for a short period of time......30 mins later need to take off either one

Dx you want to sell your HD660 because of glasses?

Tissue mod on my HD668B......before changing to velour pad

feels more comfy, no improvement on the sound though

HD660 is pretty power hungry, small player couldnt just squeeze it to its maximum

so, how does it goes for HD661, easy to drive?

Hello, for the HD660, impedance is 150 ohms? Can be driven properly by the C30 ? How is it's clamping force, hopefully not too tight.

me 

Lol... I own EP630, Groove and 381F. 381F is really really lack of bass. EP630 is muddy, overwhelmed, Groove is moderate for me. But 381 really shines in hjghs, perhaps a bit too much.

I prefer my 381f over groove. The groove just feels like it lacks something..and the bass it a little more compared to the 381f, perhaps a little more than I liked..

Might as well buy Beyer instead

651 isnt foldable. 572 is the one foldable. But both is small enuff to be portable. However 572 earcup is quite small hence its on ear.