i've been trying to figure this out, but i'm having trouble finding adequate resources. i am using a traynor yba-3 custom special [a classic canadian tube head, rated at about 160w at 4 ohms]. as far as i can tell, this amp has a 4 ohm output [from the main speaker jack]. according to manufacturer specifications, the extension port is wired in series [so that i would need two 2 ohm cabs, or one 4 ohm load] this is where i run into a problem. i have two swr cabs [2x10, and a 1x15], both rated at 8 ohms. if i run both out of the main + ext ports, i would have a 16 ohm load. can this tube amp handle this? or is this going to result in an overworked amp? unfortunately, i don't have access to any 4 ohm cabs.. guh. thanks so much in advance.