TA15 Stack

Each cab has a single input and an 8 ohm speaker. What can I use to hook these two up to my TA15's 4ohm output?



The top cab is open back. The bottom cab is a Thiele.

So the TA has single 8ohm and 4 ohm jacks? You could use a serial -> parallel box to convert the two 8 ohms into a single 4 ohm load. I didn't see the manual on the Mesa website; it should have the information.

I have the identical rig, and noticed that my Thiele cabinet had a black plug on the back plate in what turned out to be a second input. If you pry the plug out (assuming your cab is the same), you can daisy-chain to the open back cab (mine also has only a single input; no second input with a plug) from the Thiele, which in turn would be plugged in to the 4 ohm output of the TA-15. Failing that, plugging one 8 ohm cab into each of the two outputs of the TA-15 shouldn't hurt anything. the 8 ohm output to a 8 ohm cab is a perfect match; the 4 ohm output into a 8 ohm cab is a safe mis-match. Less power will be delivered in that configuration, but there should be no danger to either the amp or the cab.