Originally Posted by AB Hancock
Originally Posted by Bob Pariseau
If I understand correctly, you are hearing the problem on the Analog outputs only -- not when you try HDMI output.
Start by confirming that DTS Neo:6 Mode is OFF.
Then try this: Set HDMI Audio OFF. Does the pop on Analog go away? If so, re-enable HDMI Audio but be sure to use either LPCM or Bitstream -- not Auto. Also, set SACD Output PCM. These settings simplify what the device at the other end of the cable has to do when a new audio stream starts up. Is the pop on Analog still gone?
As a last check, *TEMPORARILY* disconnect the HDMI output cables from the OPPO (both of them if you are using both). Does the pop on Analog go away? If *NOT* then you know what's going on is not related to HDMI. The most likely scenario is that there is a DC voltage bias or some other form of interference on your Analog outputs which is what's causing the transient as the signal comes out of mute.
Bob, thanks very much. We've tried everything you've suggested--including disconnecting the HDMI output. The ONLY time we hear it is using analog cables. Not sure what DC voltage bias means--do we have a defective unit?
I'm a bit frustrated because we had an earlier issue with a "noise floor" in the 103--we had to turn our speaker volume down by about 10 or 12 db to get rid of the electronic humming. We compared this to our Denon DVD-3910, cranking it up to maximum volume and it was dead quiet.
The picture quality is great and the sound quality is great--particularly on standard definition CDs. If we could lose the little pop we'd be very happy campers (although I still find that noise floor issue unsatisfactory). If our six-year-old 3910 doesn't have it why should the Oppo?
Sorry for the slow response -- some networking issues here. It sounds to me like you have external interference present on your chassis grounds. This is most commonly "ground loop" interference, which is garbage current that hops between your pieces of equipment along the shields of the cables connecting them, looking for a path back to ground so that current can flow. Your "hum" with the 103 would be a typical symptom of that. This garbage current can traverse devices even if they are powered off. Exactly what SYMPTOMS it produces depend on the pieces of equipment you have turned on and the path the current is using to get back to ground. It is quite common for the 3rd prong in a 3-prong power plug to be the path back to ground. Both the 103 and 105 have 3-prong plugs. Your older equipment may not. My guess at this point is that you have ground loop interference that is passing between your amps and the 105. It may have caused the hum you had with the 103, and it may be causing the pop you are hearing now due to "volume" being present when you come out of mute between tracks (even though the content itself is silent) -- that's what I meant by DC bias.
The trick to fixing ground loop interference is finding the source of the garbage current.
These days there are two common ways for this to happen (and other less-common ways). The single most common source of such garbage is stuff coming into your house on the cable shield of a cable or satellite TV feed wire. This can cause problems even when you are not viewing that TV feed. The check for this is simple: Temporarily disconnect the feed wire where it comes out of the wall. If that cures your noise then there are things you can do to fix it, starting with correcting the grounding of that feed where it ENTERS your house.
The second most common source arises if you are using more than one wall socket to power your set of equipment and if they are not all on the same circuit breaker. To check that disconnect everything from power except the OPPO and the amp, and temporarily plug the OPPO and the amp into the same wall socket -- directly, i.e., not through some sort of power conditioner. If the noise goes away, then try plugging the OPPO and the amp in "normally". If the noise is still gone, connect the rest of you gear to power (you can leave them turned off) one at a time checking for when the problem comes back.
if you have more than one circuit breaker feeding wall sockets in your listening room there's an easy way for this problem to happen. The power feed into your house is "3 phase power", which, simplified, means there are two different ways each circuit breaker can be connected to that power feed. Circuit breakers connected the opposite ways may easily have different "ground potential", which means if you've got two pieces of gear plugged into each of them, the gear will be operating at different ground potential. In typical circuit breaker boxes, breakers installed one above the other are connected to the opposite rails of the power feed -- and thus the problem. The fix, if this is the problem, is to have the electrician move the breakers feeding your theater so they are all on the same rail in that breaker box.
A less common problem is that some piece of gear in your set has a fault and is incorrectly presenting voltage on its chassis ground. This is not a good thing. Figuring out WHICH device might be doing that is tricky, as you have to connect different combos of gear in a logical fashion to figure out which device might be the culprit.