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About ultra

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  1. I experienced this same problem with 2 XTI 4000's right out of the box. I exchanged for 2 new units and all is fine. I assume you are having the same issue and it is probably tha amplifier causing it.
  2. Would it be possible to use a USB hub to control different XTI amplifiers from my computer. It's a bit of a pain to keep having to unplug the USB from one amp to another. Thanks
  3. I am using 6 XTI 4000's. 4 in brodged sub mode and 2 in crossover mode. One of the two amps in crossover mode randomly ramps up to full output with a digital chirping popping noise. Extremely loud. Sound like a siren being turned on and off. Anyone experienced this or can tell me what possibly is causing this?