Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
You can use different subs. I wouldn't try and tap into the speaker outputs though. Instead, tap the line level going into your amp, and run it through a preamp that has two outputs. use this first preamp as the volume control, since you'll want to be able to adjust volume for both the mains and the subs with a single control.