Wookieonbass, I've played through an 1820 with JBL's. There is a trick to "improve" the tone. Plug into the normal input, and then run a short speaker cord from the other normal input to the low input. This keeps the crossover on the 10's but runs the 18" full range. Put the cab on it's side to vertically align the 10's which may or may not help.
The jumper gives you a punchier, bolder cabinet.
The jumper gives you a punchier, bolder cabinet.
