Any suggestion on bi-amp use. I have a Peavey Mark IV late 70's . It still delivers and has bi-amp capibility with built in crossover. I just last week bought used a Hartke HA5500 with 1-410 and 1-115 cabinet. Would it make any sense to bi-amp on the larger/outdoor venues. I have never used this feature on the peavey, but i assume i would crossover from the peavey to the hartke to deliver only the mid to highs for the 410 cabinet, or maybe wasting my time?