Originally Posted by k_lewis
If you are going to do this, I believe the proper way to "mute" speaker channels is to go into CB speaker config and set every channel to "off" except the R channel.
Wow, if that works as I hope, it would make such testing very easy. In most speaker configuration systems, if for example you tell it there is no center speaker, it not only leaves the C output silent, but it reroutes the C signal into the L/R speakers so it remains audible. This downmixing is correct in normal circumstances, and even for the Matrix mode you enjoy. But it could disrupt the test I am suggesting if setting the various speakers to off causes any change whatsoever in signal handling.
So, to ensure this is not happening, it is best not to inform the system any speakers are being removed. Just disconnect all but the right speaker.
Originally Posted by cannga
1. I only have digital going into the Theta (all analog signals going to CJ tube pre). Could you revise the test for digital, as mentioned above?
Yes indeed. The same test can be done with a digital source. It has to be a case where there is signal present in only one channel, preferably a 2-ch source. One that I have on hand is Alan Parson's Sound Check II CD, track 34. Another is the earlier Sound Check CD, track 2. These are available as online downloads for burning on CD-R. Or, if you have the AIX Blu-ray test disc, it has a PCM 2.0 channel ID test signal that will work fine via either S/PDIF or HDMI. Any such test signal will work as long as it is purely in the Left channel.
2. I tried to decipher your testing conditions/parameters but couldn't. Would you please explain, in above test:
A. If there is audible signal on R speaker in any particular mode, stereo or matrix, what does that mean?
B. If there is no audible signal on R speaker, what does that mean?
When you play the L-only signal, and the L speaker is disconnected, one would expect to hear nothing. If you hear nothing, there is no signal processing that would affect the spatial properties of the channels. If, OTOH, some of the source audio is audible in either the Stereo or Matrix modes, that could tell us something about why they sound different. The one with the crosstalk is not pure stereo. If no crosstalk is heard in either mode, this eliminates one of the possibilities, but does not assure they are treating the source audio identically.