I use the little Carvin "full rangers" with a 12 and I discovered something really unusual. Instead of increasing the volume with an additional speaker (by reducing the total impedance), they actually do the reverse. I wouldn't plug more than one 8 ohm cabinet into the extension jack. You'd probably fry the amp with two.

Strange, but very useful little guys. I have two: one in black carpet (been using for 10 years-no effects) and a 5 year old green one with effects and a matching green extension speaker.


Good luck!

R.