Originally Posted by cn9601
Just to elaborate a little more.
The 'boomy' noise is intermittent. Sometimes, the sub will sound 'boom....booommmmm....boom-boom....' during dialogue moment during movie play. And during scene of gun shooting/arty shell dropping, there is 'additional' audible 'boom....boooooooommmmm....'. And this is intermittent.
Test tone initiated by Onky AVR and Oppo95 does not produce that 'boomy' noise.
Anyway, I will grab tat AIX test disc to chk it again, as suggested.
Tks a lot.
Is the extra sound more like a thud or a buzz?
Getting subwoofer output during dialog often means you have the crossover set way too high for your Center speaker. But that wouldn't be intermittent.
An echoey extra booming, which is what it sounds like you are describing, is a pretty unusual symptom. It is unlikely to be an HDMI cabling problem. If you have a bad ground loop I suppose it is possible that your sub is bottoming out.
Anyway, the starting point is to check your levels and your crossover settings.
You mentioned the DTS-HD MA "bomb". Unless you have an older HDMI receiver that's never been updated, it is unlikely you have that, as all the manufacturers fixed that a long time ago. The DTS-HD MA "bomb" is a SCARY loud noise in multiple speakers -- not just the sub -- and always repeats at the same time code of whatever disc triggers it. And of course it only happens on DTS-HD MA tracks. Again, I don't think this is what you are hearing.
Since you are having the problem on HDMI audio, if your receiver can decode the various audio tracks that are giving you problems, then compare decoding in the Oppo (HDMI Audio LPCM) vs. decoding in the AVR (HDMI Audio Bitstream).