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Infinity IRS Betas Make Loud Noise When On

I just recently purchased some used Infinity IRS Betas. With both base towers hooked up to the crossover, the system makes a loud noise when I turn the control unit on. If I unhook the left speaker, then I don't get the noise and the sound is fine, but I hear a low hum. Same thing if I unhook the right speaker. I only hear this loud noise when both speakers are connected. I have checked, double-checked, and triple-checked my connections, and all looks correct according to the manual. Also when I disconnect the servo control unit and play them as full range speakers, they play fine. Does anybody have any idea what could be the cause of the problem?
gcooper621

Showing 1 response by russ69

russ69's avatar
russ69
179 posts
 
Not familiar with Betas but it's probably similar to the RS1Bs that I run. The servo unit is phase dependent, the phase has to be be correct. It sounds like the amp or pre-amp might be inverting the phase. You need to find that out and then connect accordingly. I have a couple of servo controllers but they are a pain to run. Your servo controller is going into protect mode. You are lucky the early models would just blow. They often have hum. One of my units worked fine and then started humming out of the blue so that is when I scraped it (saved it for the next guy).
I have run my system without the servo controller, just using a crossover and it works fine at the levels I normally use. Those systems are state of the art and finicky. Trouble shooting is difficult and not much fun.
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