I have a Onkyo TX-NR525 I bought as a refurb from Woot a few weeks ago. I'm loving it except for a problem i'm having with a very noticeable amount of white noise when switched to Theater-Dimensional, Stereo or Mono. It does not occur in Direct mode. It also gets louder as I increase the volume. I like the T-D mode as I have a 2.0 set up.
It seems to only occur when the system is actively using it's DSP. For example, when listening to a DTS stream, I hear the noise kick in while the movie is playing (and in T-D or Mono mode), but stops when I hit pause and the DTS stream stops.
When I am using a stereo source (Stereo from PC over HDMI, stereo from RCA digital, Stereo RCA analog) initially there is no noise (before there is any audio signal sent to the receiver), but once I play a signal, it is ALWAYS there (in TD or Mono mode) even when I pause/mute the audio from the source.
I currently have a 2.0 with Polk Monitor 40 II's that Audyssey MultiEQ has calibrated as Large speakers, 10 ft away, -6db. Not sure if these matter, but here they are: Panorama off, dimension 0, center width 3, center image 2, listening angle wide.
I've tried unplugging ALL cables except power and speakers, and tried isolated power outlets with and without an old Monster Cable MP SW 200 Subwoofer PowerCenter
, the noise is still there.
It just bothers me things aren't "perfect." Maybe I'm just being too picky with the equipment I have, but I'd like to know that it is not a problem with my specific receiver.
I tried searching, but couldn't find any other threads here or anywhere while googling.
Thanks in advance!
EDIT: Found a few threads regarding other Onkyo receivers with 'humming" and HDMI grounding issues. Even with every cable (including HDMI) disconnected except speakers and power, the power cable the only device plugged into a circuit, and the chassis ground to my copper piping I still have the noise/hum/buzz in T-D mode.Edited by m4ha7m4 - 1/2/14 at 11:56am