digital room correction

I agree with Bryon. Treating a room with room treatments will give the depth and imaging that you've heard so much about.
So many people buy the best gear and stop short of treating the room. They're only half way there if they do.

Nothing, and I mean nothing will do more for a system than a well treated room.

I also agree with Bryan. Find the sweetspot for the speakers, and the correct toe-in first. You should have some basic room treatments, including side-wall reflection absorbers. Use a hand-mirror on the sidewalls to determine where to put them. 4" sonex works great, but its ugly. If you have WAF to deal with, then see the nice graphics you can get on the GIK acoustic panels.

Once you have these installed and the speakers located and toed-in properly (this can take months of trial and error, but worth it), then you might consider adding some 1/4 round ASC tubetraps near the rear insides of the speakers. Face the round surface inwards. These then can be "tuned" by moving them forward and backward along the inner line of the speaker walls. You can also rotate them slightly outwards to improve width of soundstage. These tubetraps in this configuration are not being used for bass, then are reflective in order to scatter unwanted backwave.

Finally, once you have these all done and it sounds pretty good and the image is focused (the source components must be really good for pinpoint imaging), then use Amarra EQ to dial-in the remaining bumps in the response. You will need a decent capacitor mic and a handheld spectrum analyzer. Then you will know where the bumps are and be able to input these to Amarra EQ and eliminate them. As long as you do 6-8dB of correction for each bump, this will sound good. Dont get carried away. Amarra EQ is extremely transparent and has 3 tunings for 3 bumps or rolls in the frequency response.

Room correction is less important than tuning the speakers in the room to get them as flat as possible.

Steve N.
Empirical Audio

I disagree with EQ being more important than room treatments. I've never had my system EQ'd and the soundstage and imaging are spooky to say the least.
Though, if you have a speaker that is not sized to the room, maybe EQing would be important.
I'm not stateing that I couldn't benifit from Eqing my system, but for imaging and depth in soundstage that the OP is searching for. It's hard to beat room treatments and speaker placement.

Download HolmImpulse (Free) or REW also free and get a micpre and a calibrated mic and do some room measurements.

It's the ONLY way to really know what's going on and correct it.

Good Luck!

"I disagree with EQ being more important than room treatments."

That's not what I said, I said "Room Correction", not room treatments. Room correction is generally DSP software that tries to eliminate room and speaker anomalies by changing the signal. This is more than just EQ tweaks usually and more focused on bass.

I have use room correction with DEQX equipment at shows.

Steve N.
Empirical Audio