I was back in Gibson City for a really small rock concert–only about 250–300 people in the crowd. I had a small rig complete with an old Yamaha 1604 mixer for FOH and monitor mix all in one, and let me tell you that dinosaur can do some damage. I had two Peavey Impulse 1015 speakers and subs, with an ART EQ-355 and Alesis 3630 compressors. Well, the man I purchased my Impulse speakers and subs from said that they were all 8 ohms "speakers and subs". The venue was a little bigger than what I was told on the advance so, with my QSC RMX 1450 and a 2450, we decided to bridge both to get more power. We turned up the music that was being played and instantly both amps clipped– channel one and then channel two. We spent all night trying to troubleshoot the problem before and even during the concert, with no success. Two months passed and we still never found the problem.
Since the speakers and subs were bought off a private dealer there were no manuals for the Impulses, so we had to get on the Internet. Peavey had no specifications to help us at that time, and QSC phone crew couldn't seem to help either. Another month passed, and an upcoming event at the same venue was forthcoming. We started preparing, and as we were going through all the equipment I couldn't remember what the crossover was for the Impulse subs. I pulled one out and was reading the back and there, right beside the crossover section, was the ohm rating. I don't know why I didn't see it before, because right there it said "impedance 4 ohms." So, with the Impulses and subs we had been bridging the amp into a 2 Ohm load. Boy, I felt like an amateur on his first day. Glad to say everything has been corrected and has been going well from then on.
Samuel D. Thompson
A/V Innovations, Gibson City, IL
www.avinnovations05.com
