Looking for some advice. Something curious has crept up in my system. When one of my kids was loudly making an "Ooooohh," sound my left front speaker would mimic it in a sort of feedback response. If I hit pieces of metal together the speaker responds as well. Has anyone experienced this and if so what is the culprit?

I am using a Marantz SR 5005 as a pre/pro that was modded by removing the amp pathway by Outlaw Audio. I then have the L/R off the Marantz going to HT inputs to a Modwright SWL 9.0 being used as a stereo preamp and bypass for home theater. Oppo -83 HDMI to Marantz for home theater, coax to Eastern Electric MiniMax DAC for stereo on to Modwright via RCA. M22's, VP100, and QS 8's.

Thanks, hope I provided enough info.

Sips