I just received my VT30 today and just for kicks I ran a cord from the headphone jack to my old Peavey Twin 12 in front of the amp and it sounded awesome with more volume than I`ll ever need. It has 130w. I also have the ability to EQ it better. I also am thinking of installing a external speaker jack to run a 412 cab. If anyone does this please post how it worked out.