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 cleeds

I am not sure that there is anything awry with your system. The servo-crossover should be turned on before the bass power amplifier(s). When first switched on, the red "power on" indicator should illuminate, and the green "servo on" should come on a few seconds later. It's then safe to turn on your amplifiers.

As the manual explains, if your preamp has two sets of outputs, you can wire the mid/hi frequency panels directly to your mid/hi power amp. That is the preferred way to connect this system.

When powering your system down, the best practice is to turn the amplifiers off first, and then the servo-crossover.

You should also check the gain of your bass amplifier(s) and set the open loop gain compensation switch (on the servo-controller back panel) accordingly. Note that especially if you are using bridged anplifiers, you'll need to reduce the gain with that switch.