Originally Posted by Jgrabs07
You're welcome. "Line Out" usually indicates that the signal is a copy-cat of what's being sent to to the 400's internal power amp. The line out level / strength, while not affected by master volume, is still a product of gain, external FX, and EQ levels. You'll neede to set your slave amp attenuator levels accordingly.
Sounds like fun! Are you adding extra speakers or just going to drive your existing 15's with more power?