Anything new with digital room correction?

My Lyngdorf DPA-1 sure does the trick without changing the music (I've done exaustive listening testing around this using my prior preamp Ayre K-1xe). I'm not sure if you can only correct a certain frequency, but maybe you don't need to?

Why does it need to be digital? If you want the purest way to deal with room modes operating 350 Hz and below and not messing with the signal above why not use the Rives Audio PARC. Here's a link to a reveiw.

Because most people spend most of their time listening to CDs or other digital formats. If digitally recorded music is kept in the digital realm there is less information lost, and a much higher end product.

It's certainly better if you go from digital out to processor before converting to analog. Not everyone has a separate transport (or source) and DAC, in which case an additional D/A and A/D is required. Even so, I do not agree that the digital correction is better. There are some that are good, and others are horrible due to digital artifacts. Some use very steap slopes and sampling of curves that cause a ringing artifact. My graduate work was in digital signal processing and I know the caveats of attempting this in the digital domain. This is the main reason we went to an analog only domain system.

I'm still curious from Sashav's point of view why digital for his application.

it robbed music of transients, dynamics and details were seriously affected.

I think you have to get used to it. If you have been living with room modes for a while then the presentation seems kind of exaggerated and you can get used to the larger than life presentation (like having lived with the contrast always jacked up all the way on a TV - either a note is very strong or it disappears in a deep null - very lively but unrealistic and lacking nuance)

I would not try to do much above 100 Hz in terms of adjustments and of course only on peaks. 100 Hz is 10 feet so a quarter wavelength is 2.5 feet and you are getting down to the sweetspot size.

Bear in mind you have to do room treatments first - as the nulls cannot be corrected for except by improving acoustics - so for sure it sounds dull if you have no bass traps even if you have EQ'd to remove modal peaks.

I agree about ringing of filtering can in general be a problem and fast digital filters with short taps are not always of highest quality and extreme settings can lead to ringing and phase problems.

FWIW I'd recommend only EQ the sub and don't aim for anything near perfect flat - just get the worst 10 or 15 db broad bumps reduced to a reasonable size (no more than +6 db and your ears/brain will handle the rest) and preferably don't try to EQ the main speakers - just in case you muck up the mid bass and lower midrange from digital filter ringing or phase issues. Remember that above 140 Hz you begin to hear directionally so I would not recommend mucking about with sharp (high Q) filters that may affect phase.

One advantage of digital filtering is the phase behaviour can be better controlled.