I tried the bass port mod on a mid-2015 007, and reversed it after a week. It made the Stax fart, normally a rare occurrence, intolerable. Happened every time I moved my head. Some people think the mod does such wonders that they tolerate the side effect. I'm not one of them. YMMV, obviously. The Carbon works well with everything, but remember that the two outputs still only have one volume control and the 007 plays quieter than any other Stax (that I know of). Matching listening loudness can be a problem with two people listening to one amp.