I got my new Oppo 103 and R-972 toys from FedEx today.
If nobody else takes the bullet for this, I might do it with REW. Actually, since it's relatively easy to do, I might do it before I move into anything else with my experimentation.
Q for the group:
For publishing purposes, to avoid drowning the thread with graphs, what do you think would be most useful to present for looking at the delay question of recent days? I'm thinking:
- L/R+Subs and Subs alone, in the 15-200 Hz range and full range for FR
- Waterfall (L/R+Subs)
- Bass decay (??? it's single speaker as per your REW guide)
I really should wait until I get the R-972 hooked up, but I'm tempted to do this just with the Oppo 103 feeding into my Denon, with REW connected via laptop HDMI audio to the Oppo, and then on analog (for this purpose) from the Oppo's outs. That should give us a reasonable standard to ID comparisons to see if the delay settings from the AVR are getting applied on EXT. In.
If so, I'll do it the simple way - I know my L/R mains are crossed at 80 Hz, so I can use that for the Oppo's settings. As for delay on the Oppo, as per the post I'd written I'll test it the A/B/X way. After level matching the analog output to 75 db +/- 0.5 db, of course .
I think I may have beat you to it. Here is the test I ran:
- Send mono REW test signal to left and right AUX IN jacks on the front of the receiver. Audyssey off. (AUX IN applies the AVR distance and trim settings to the output.)
- Measure three frequency sweeps, varying the left and right speaker distances by a large amount. Expected outcome: noticeably different frequency response curves due to the distance variations. Measurements confirm expectations:
- Re-wire the REW input to the left and right EXT IN jacks.
- Run another three measurements, using the same distance variations as used in the AUX IN test.
For all practical purposes, the three graphs are the same. The slight variation between 1K and 2K is most likely due to slight variations caused by my "quick and dirty" measurement techniques. In retrospect, I probably should have measured the pre-outs instead of the speaker level outs...
So, I would conclude that the EXT IN connection ignores all distance settings in the AVR (which is what I believe we all expected, and hoped for). Comments?