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However, I plugged the amp into my cell phone's headphone out port and also did not hear the screeching at all.

Thus, I ruled out the subwoofer as the culprit and did not test hooking the amp up directly to the speakers (note that I also noticed the screeching when plugging in the headphones into the amp so that also rules out the subwoofer). I plugged headphones directly into the SB Audigy sound card on the same 3.5 mm slot where I had my speakers and did not hear the screeching at all, even after turning up to a uncomfortable volume. (The onboard sounded worse so I went back to the Audigy for subsequent tests.) I switched from the SB Audigy 2 ZS to the onboard sound card (Realtek ALC892) and continued to hear the screeching. I did not notice screeching when I plugged these same headphones directly into the sound card.Īny tips on how I could eliminate this high-pitched noise? Thanks. If I use headphones with this amp (Logitech Gaming Headset G330, which doesn't usually need an amp), the screeching is noticeable at the absolute lowest volume. The ringing is very noticeable by the time it's at the 11 o'clock position. The high-pitched screeching begins to be audible when I turn the amp to about the 9 o'clock position. Have not experimented with amp placement because my desk is really inconvenient for re-wiring speakers and I cut the speaker wire to almost the exact length for my current placement.The amp is less than an inch from two monitors, and the speakers are about an inch from my sides of my monitors.From sub's speaker out, same speaker wire, about 50 inches long, into the dual 5-way binding-posts on the Monitor 30Bs.From amp, generic stranded speaker wire that I stripped myself with scissors (I did nick the core a couple of times when I stripped it), wire gauge unknown, about 40 inches long, into the sub's speaker in.3.5mm male-to-male, followed by the included 3.5mm female to RCA male into the back of the amp Sound card: Creative Labs Sound Blaster Audigy 2 ZS.Speakers: A pair of Polk Audio Monitor 30B.Amp: Dayton Audio DTA-100a Class-T Digital Mini Amplifier 50 WPC.I recently upgraded from cheap Midiland computer speakers to new Polk Audio speakers with a new Dayton stereo amp and since then, I've noticed a constant high-pitched noise from the speakers.