I know this can be done, but I'm not sure if i'm the one to do it
So Ive got a Carvin 4 Ohm cabinet that I bought about 3 years ago. i got it because i foolishly believed that a 4ohm cabinet while allowing an amp to use more of its wattage would be significantly louder. Turns out it doesnt. Anyway, I wanted to use a second cabinet I have at the practice space with my amp, except that combining a 4 ohm cab and an 8 ohm cab produces fewer ohms than my head's 4 ohm minimum.
So, is it just a matter of resoldering a few wires and calling it a day? Or should I sell my 4 ohm cab and get another 8 ohm cabinet? The cab I have is a Carvin BR210-4C.
Well the speakers in that if it's a 4 ohm are 8 ohm each wired in parallel. So you can wire it up for 16 or 4 ohms but not 8 unfortunately. However, if you run it in series with an external 4 ohm cab you'll get an 8 ohm load which should be plenty useable OR if you run the whole lot in series/parallel you'll get 5 1/3 ohms. In other words, wire up the speakers in your BR210 to series from the parallel for a 16 ohm load. Connect another 8 ohm cab to your second output from the head and voila, 5.33333333 ohm load.