Experiences by Owners of Lyngdorf Integrated Amps using the Room Correct feature

Now to answer the OPs question and stay on topic. Yes the room correction feature can improve the sound in a given room with many different speakers. It certainly did with my Acoustic Zen Crescendo and Harbeth 40.1 speakers. I also know of 2170 owners that did not realize the same degree of improvement as I did. It will really depend on several factors. Here are a couple to consider.

If you have taken the time to fine tune your speaker placement using set up methods such as Sumiko, then the RC may not yield as much improvement. However, if your listening space is not a dedicated room and the speakers have been placed out of the way to please your spouse, then RC can help greatly.

With the speakers I mentioned above the bass became more full and impactful. Without RC the speakers sounded a tad thin through the mid-bass. RC gave me more of a full bodied sound which I wanted. Now here is where the subjective aspect shows up again. Others may have liked the leaner sound more. Our impressions and experiences always have a subjective aspect to them. Always.

In another room the RC feature helped the 40.1 speakers sound less muddy and thick. It just going to depend on your speaker, room, and listening position. All shared experiences will likely differ. 

The only way for you to really know is to trial the unit in your room with your speakers. This is the ONLY way for you to really know for yourself.

The responses thus far are appreciated.  I did also read past threads discussing the RC feature.  I think for now I am going to pass on buying a used unit.  Perhaps I can arrange an in home trial as I am concerned that the Lyngdorfs even with the RC working may still sound on the lean side.  I don't think I would like that type of sound.

Just to clarify, the 2170 is not lean sounding by nature.  It is a little on the warm side in terms of sound personality.  It can be part of a system that sounds a bit lean based on the room, associated gear, and the various other factors I mentioned above. I would not call the 2170 lean sounding on its own. 

I heard the 2170 at a friend's house and we compared it against a Pass 250.8 and a xp10. I don't recall the speakers as he has since changed them. It sounded pretty good and tamed some nodes he has in his very square listening room, however it lost some soul along the way and sounded HiFi versus musical. He did the proper set up and measurements but it just seemed artificial. I don't know how to describe it better, but I bet you all know what I mean when I say that. That said, for the price compared to the Pass gear, it didn't embarass itself at all. YMMV, as in all things in this hobby!

I owned the TDAi2200 years ago and it was a very good piece of kit. No matter the room or associated equipment the sound was always improved when activating the RC versus running it in bypass mode.

The unit sounded good as a straightforward integrated amp, and became very good with the Room Perfect feature engaged. Unlike most room correction devices there's very little learning curve involved, which is nice for an older dude with a learning disability such as myself.

Expect the soundstage to open up in all directions and for image focus to improve. Expect better integration of lower frequencies, though this will depend on how you configure your system. If you have dual stereo subs and satellites the Lyngdorf unit is for you.

Here's a review of the older Lyngdorf TDAi