Originally Posted by stevepow
Originally Posted by Bob Pariseau
^ If the LF/RF speakers are set to Small, then the Sub in a 2.1 configuration needs +15dB boost -- usually done external to the player -- to match the RCA multi-channel outputs. ... Accomplish that with the volume knob on your Sub.
I'm trying to wrap my head around this and how to best set it up.
I have a REL Sub connected to the SW out of the Marantz 7701. I turned the REL's level down to about 1/4 turn to give Audyssey some room to do what it wants to do. I have run the Audyssey setup and it further attenuates the Subwoofer 9.5dB (subwoofer level set -9.5dB for all inputs, although it appears that I can change individual input's subwoofer level after the fact - such that HDMI In would stay @ -9.5dB and 7.1ch In could be @ -9.5 + 15 = 5.5dB).
So I can compensate in the 105 subwoofer trim, the 7701 7.1ch subwoofer level, or the REL (but if I turn up the REL, I have to turn down all the other inputs to get Audyssey back to the right place).
Am I on the right track on in the weeds? Is there an advantage turning up the subwoofer level in the Marantz processor versus the 105? I'd rather not adjust the REL as that puts me back at square one I think.
ps - mystery completed solved on my sub turned OFF and LARGE FL/FR - I had toggled through the downmix settings and didn't realize it would reset those speakers.
The first thing you have to figure out is whether Audyssey in your Marantz can be applied to its multi-channel Analog inputs, and whether you want that to happen. If the answer is Yes (to both), then you do not want any processing happening in the OPPO on those multi-channel Analog outputs.
So set all speakers Large (Sub ON), equidistant, and with 0dB volume trim at the OPPO outputs. (It is unlikely the Marantz will let you mix XLR from the OPPO for LF/RF with RCA for the other channels, but if it does, you'll need to also find out if the Marantz offers selectable -6dB attenuation on the XLR portion of that multi-channel input, and if not you can do that in the output volume trims on the OPPO). Audyssey in the Marantz would then do all the work. The +10dB boost needed by the Analog Sub input channel in this configuration is "standard" and so Audyssey should be applying that automatically. Check with a calibration disc.
(NOTE: One advantage of such a setup is that you can switch between SACD Output PCM and SACD Output DSD on the Analog outputs without screwing anything up, since your settings don't require any audio processing in the OPPO for either case.)
If Audyssey can NOT be applied to the multi-channel Analog inputs in the Marantz, or you prefer not to use it with those, then the next thing to find out is whether, with that multi-channel Analog input set to direct, unprocessed "pass through", you can separately control the Sub output trim for your digital sources WITHOUT AFFECTING the multi-channel Analog path. This will likely be the case since that's what Audyssey is doing after all.
In that case what you do is FIRST set up the multi-channel Analog path -- with Audyssey disabaled on that path. This will require you to manually adjust the Sub's volume knob to apply the necessary boost. Check by playing a calibration disc. Odds are even though that path is not processed, the Marantz will be providing +10dB of boost by default. It may even have a setting to apply +15dB of boost (needed if you have any speakers in the OPPO set to Small). Whatever the case may be, if your testing with the calibration disc shows the Sub is producing the same output level as the other speaker channels then you know you have the sub's volume knob set correctly.
Now, with that completed, go do your Audyssey setup. It will hear output from the Sub according to the volume knob setting you've already made on the Sub, and Audyssey will compensate as necessary to produce the correct Sub output for your digital sources as well.
Use your calibration disc (I recommend the LPCM test tracks from AIX Audio Calibration, Blu-ray) to re-confirm the ANALOG path is STILL correct after that Audyssey setup, and then use the same disc to check HDMI audio from the OPPO into the Marantz to confirm that Audyssey has also done the right job for the digital path.