XB700 pads? I think those pads would kill almost any headphones sound quality by adding too much bass. Maybe not on the K601 if they compress a lot.
I actually tried using the XB500 pads with an SR-225 and put the DJ100 driver in an XB500. makes them both too bass heavy.
I think the main reason the XB500 has so much bass is because of the pads.
yes to all. they kill the soundstage, the mids and to my surprise made them brighter. bass was still non prominent. in other words they ruin the headphones.
the back of the cup in the XB series is flat, and besides the big driver, the secret of the bass must be in the pads indeed.