Where is the bass going?

[ddude003]

Could be a difference between Standard Stereo, a Pure Sound setting and/or DTS, Dolby Digital and LFE settings in the AVR? Typically a 10db difference between some of those settings...

 

[robbnj]

No, just don't leave the settings as default and use the EXCL device entries where available. Note that if you disconnect a device while REW is running the setting is likely to be lost. Your bass issue with stereo input is likely to be due to processor mode selection, your speaker settings (small/large) may also be a factor.

OK. I have always gone in and deleted all but one instance of a device, even when they are the same thing.
Your program gives that handy warning if you lose a connection while working in it. Very nice.

The speakers are set to large, but processor mode has me wondering. If REW can send out individual and independent signals to each of the 6 channels, shouldn't the system recognize it as a "Dolby Digital" stream, and not be applying any type pf processing to the signal?

 

[JStewart]

If REW can send out individual and independent signals to each of the 6 channels, shouldn't the system recognize it as a "Dolby Digital" stream, and not be applying any type pf processing to the signal?

The various Dolby streams are compression encoding formats. The processor decodes them to back to PCM.
Any channel processing (upmix, downmix, soundfield, bass management) is applied to a PCM signal.
REW sends PCM in the first place.

 

[robbnj]

The various Dolby streams are compression encoding formats. The processor decodes them to back to PCM.
Any channel processing (upmix, downmix, soundfield, bass management) is applied to a PCM signal.
REW sends PCM in the first place.

I threw "Dolby Digital" in there as an uninformed way of describing what I thought was supposed to be completely separate channels. Separation such that the only sharing of info across channels was done in the actual recordning, as opposed to ProLogic, where the center and surrounds were derived from commonalities between L/R or differences between L/R from a stereo mix.

Maybe "discrete" would have been a better term, but it wasn't popping in my brain at the time.

Some type of mixing was suggested, but I wondered how that could be if REW was sending discrete signals to each channel.

 

[JStewart]

Some type of mixing was suggested, but I wondered how that could be if REW was sending discrete signals to each channel.

An upmixer is processing and rerouting discrete channels according to its algorithms. For example if an upmixer is on I’d expect signals to only the left or right to remain (mostly?) unchanged while both L&R together would also route to the center with decreased volume on the left and right.
Unless you’re specifically looking to test what an upmixer is doing they should be off.
This said, I can’t figure how an upmixer would entirely explain your results, but if you found one had been on during your measurements they would be invalid anyway, so may as well measure again and see.