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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
gcooper621 OP
2 posts
 
When I hit the power button on the xover, I hear both. As soon as the green light comes on the xover, it pops really loud and it goes into protection mode.
rodman99999
6,129 posts
 
If one of the AC outlets that your various components are plugged into is wired out of phase; you can experience the same result as the mis-wiring of the bass Management system and towers. An inexpensive tester such as this, can tell you if that's the case: (http://www.amazon.com/Sperry-Instruments-GFI6302-Outlet-Tester/dp/B000RUL2UU/ref=pd_sim_469_1?ie=UTF8&refRID=1GVME041151YJ24Q6J9T&dpID=51mLOd%252BDHqL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_)
atmasphere's avatar
atmasphere
11,793 posts
 
What goes into protection mode- the amplifier?
Ag insider logo xs@2x
cleeds
5,944 posts
 
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.
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