I have yet to add anything since I just completed the build. If I unplug the speaker the noise is sine present but not as amplified if the speaker has power. I have a notion it is coming from the t-07 even with the controller off it can be heard.

For now the napkin trick has muted it to where at full volume it can not be heard from 10'. Otherwise it was clearly heard over the speaker tank at 20'. Fisrt time I have actually been thanfull i can't hear that range.