halojen said:
..anyway, with a two-core
speaker cable you cant really go wrong cause if you get it out of
phase, so what?
If you get it out of
phase, go back and do it right. I spent a couple hours with a DJ friend last night, getting ready for a big outdoor gig we're working together this Saturday. When we talked on the phone, he was certain I'd have to rebuild one of his
power amps. The clip lights were coming on constantly, but he wasn't getting any
bass. The problem wasn't his amp, it was his
speaker wiring.
He's got four very nice EV dual 18" subwoofers, but they're kind-of old and had been repaired, over the years, by someone who thought "...if you get it out of
phase, so what?"
In two of the cabinets, the top and bottom speakers were out of
phase. The speakers were working really hard, but the cabinets were putting out next-to nothing. They just moved a lot of air inside the cabinet - very little got out.
In the other two cabinets the speakers were in-phase, but the cabinets themselves were out of
phase. The result was that one would push and the other would pull. Directly in front of either cabinet, the
bass was overwhelming, but at any
point in-between, the
bass disappeared.
The speakers and amp were working really hard moving air from
speaker to
speaker and cabinet to cabinet, but they weren't moving much of it out to the audience.
I rewired his subs so all the speakers are in-phase with each other
and with the 15" drivers in his mains. We nearly knocked his garage off it's
foundation without lighting the clip lights on his amp. This gig's going to be fun!
John
