Sorry, another question.Have you disconnected all of your sources from your pre-amp, in fact unplugging them is best, and then rotate your volume control to its 3 o'clockposition and see if you still have the noise? Rotate to max, any noise then? If the answer happens to be 'no noise' then add your sources back, one at a time until you find the one which starts the noise as previously described.
If the answer is there was no change from your fully connected system then you have either found the noise floor of you pre-amp or that you have something in the circuitry in the pre-amp prior to the amplification stage which is causing it. You might then contact ARC and ask their service department techie.
If the answer is there was no change from your fully connected system then you have either found the noise floor of you pre-amp or that you have something in the circuitry in the pre-amp prior to the amplification stage which is causing it. You might then contact ARC and ask their service department techie.