Originally Posted by dougri
Thanks… yeah, I suspected the DT specs were a bit optimistic (spec'd 40 Hz x-over for my LCRs), but it is a LOOOOONG way from 40Hz to 150Hz where sub localization is concerned
Any thoughts on tuning the inputs to the R-972 with some PEQ (e.g. with the nanoavr… keeping it HDMI so trinnov is still applied)… -15dB to -12dB is as high as I go on volume, so I have a little flexibility with level trimming the inputs I think.
You could use the NanoAVR to cut peaks, but I wouldn't use it for boosting any dips to avoid overdriving your speakers, especially in the low bass frequencies. The MiniDSP folks caution to keep boosts to +6 db with a Q of 1 or less, which may be too broad for your purposes, and in general, you'll find that using boosts with REQ is a controversial subject. For conventional speakers, you could experiment with placement to see if different placement options will give you higher crossovers, but with built-in wall units, that's less practical. FWIW I think I've seen similar issues raised with Audyssey and wall-in speakers, so it's hardly a unique problem.
Keep in mind that between-channel volume on the R-972's Trinnov cal is relative; it's less the absolute volume as the spread of volumes between the channels that's meaningful, to achieve optimal gain structure by having the channels as close to equal levels as possible in order to avoid losing dynamic range. And you'd need independent measuring gear (a USB mic such as the UMIK-1, along with REW) to make the NanoAVR a practical direction.
As to whether "pre-EQing" an HDMI signal before running Trinnov is a good idea, I think it would be difficult to pull off well, since the Nano's really designed as a standalone solution that provides bass management, delay, crossovers, low/high pass filters etc. before applying EQ. How well that will interact with what Trinnov's doing for the mains and choice of crossovers is questionable. You might be able to "EQ" each channel as full range, not do any matrix routing/bass management, and get away with very limited EQ, but whether that works in practice I would check with Curt.
There's another issue, which is that you'd need to have the source device provide surround sound processing and convert the material to LPCM before running to the Nano. That's OK if you intend to play the source as is (e.g. a movie that's got a DTS-HD 7.1 soundtrack, such as The Hunger Games: Catching Fire) but will be limiting if you want to use the Sherwood to upmix a native 5.1 signal to 6.1 or 7.1, or stereo to 5.1/7.1.