This is a very tentative feeler! EDIT: NOW OPENING UP TRADE OFFERS TO ALL SMALLISH 2-OHM CAPABLE HEADS! WILL STILL CONSIDER A MARKBASS F1 AS WELL. I have a 2 channel Markbass LMK head in great condition (a few scratches on the casing, but that's it). It works perfectly and sounds great. I honestly think that this amp has one of the best dual-channel feature sets available (I'd be happy to answer any questions on this). Unfortunately, I'm not taking advantage of the LMK's great switching abilities because I never end up using multiple basses at my gigs. Here's info on the LMK: http://www.markbass.it/products.php?lingua=en&cat=1&vedi=68 Thanks!