I'm driving some VMPS Supertower/R SE speakers with bass flat to 25 with the Marsh. These have four 15's and two 10's handling the bass. It does it excellently. Had a Parasound HCA 3500 prior and the Marsh matches weight but has better quality. You may also be pushing that little amp farther than it wants to go. Bass takes alot of watts and a tube amp with low power will certainly be wanting. I've not neard the ARC but I'm sure it's better in the bass department also. I'm using an ARC LS 16 pre and with the Marsh amp it's wonderful. I love quality bass with the appropriate weight. Not one for "polite" bass.
