Deaf and grinningGrant Bunter wrote:Don't immediately assume it's the amp output that's the cause of the polarity problem.Basshund wrote:Yeah I think the polarity might be reversed out of my amplifier I will look at it properly tomorrow.
In the meantime it appears the SPL meter was set on some weird setting, reading the bottom end result maybe? With tonights tweaking, this was my final measure...
It could be one lead from the DJM to the driverack, or the driverack to the amp, on the offending channel.
A multimeter with continuity function will tell you if pin 2 is to pin 2, and pin 3 to pin 3 on each lead, and, not, as sometimes happens, pin 2 to pin 3, on your XLR's.
Check your speaker leads too, ie +1 to +1 and -1 to -1.
If you're getting nearly 130dB now, you must be starting to get that "hell yeah" grin...
I've just checked my leads, all the XLR's are good. I'm using 4 pole speakon cables to run out to the subs, which are a bit tricky to test, but given that when I run the two subs daisy chained (parallel), I wasn't having the polarity issue, I'm assuming they're good.
So.... How do I test polarity off the amp, rack, and mixer? I'm putting money on the mixer, as it was a rebuilt Frankenstein we got from a service provider. The Amp was bought new and the drive rack was vgc second hand from someone that had used it without complaint... unless he was fibbing.
As always, many thanks in advance.