Hello... I was wondering if anyone had thought or knowledge on running both the B15N (new) and a B15R (90 model). This is mentioned in Manual: EXT AMP: This feature was originally designed as a means to daisy-chain two or more B-15N amps together for additional power. This new-and-improved Heritage B-15N could also be used as a line out to feed an unbalanced Hi-Z input such as a direct box or a mixer. Any thoughts on this?