Then I implemented Room Perfect. Whoa! Full stop.
The sonic changes from implementing Room Perfect in Focus mode were all to the good. VERY GOOD! This is a VERY significant improvement to what was already truly excellent sound except for what Room Perfect found to correct and corrected.
There is now much more meat on the bone. It apparently at least partially filled in a dip I had in the upper bass/lower midrange so that the sound is more fulsome, making the frequency balance of the Watkins Generation 4 speakers I'm currently using much more like the balance of the Graham Audio LS8/1s without Room Perfect but positioned at the same distances from the walls. Lower voices, cellos, piano left hand and most any music with significant low end benefits from presenting the "power range" (say 100 to 300 Hz) and lower midrange at proper relative levels. All music sounds fuller, more powerful, more weighty and larger. Bass definition is also further improved with the tune of note-to-note walking bass becoming yet easier to follow. All this correction was made without adding any undue midbass bloat or thump. Low bass is not much affected--the Watkins speakers still roll off below 40 Hz, in other words, but the overall impression of bass weight is greatly enhanced.
Unlike my experience with the TDAI 2170 years ago, I hear no excess high frequencies injected by Room Perfect. Besides the magic in the lower frequencies, imaging is firmed and staging is considerably more 3-D. That's going some since the Watkins presentation was already by far the most 3-D Ive heard from any speakers in this room.There's also a general sense that the sound is more "present" without any audible peaks in the mids. Altogether using Room Perfect in the TDAI 3400 is a great success for my system!
I use a Cardas-style set up and have for years because this maximizes realism of imaging and staging from most speakers in my room. Those sonic aspects are the most important to me. I'm not so sensitive to bass balance as long as there is no midbass boom, which there wasn't. The Watkins speakers are on 30-inch stands. In my room that puts the woofer about the same distance above the floor as it is from the side wall. Perhaps that causes a null or dip in the upper bass/lower midrange, but that's just speculation. I know putting the Graham speakers on the 20 inch Skylan stands I first used and the same distance from the walls caused a bit of the same kind of dip/null, but not to the same extent. Moving the Grahams to the shorter Graham stands made the Grahams nice and full sounding.
If you have used Room Perfect in the past and have not achieved altogether positive Room Perfect results, check your software version. The current one, and the one I'm using in the TDAI 3400, is version 3.3.0. I also strongly suggest that you try the following "trick" set up for Room Perfect if in the past Room Perfect was emphasizing the highs or in some other way producing less than totally satisfying results.
Lyngdorf's instructions for setting up Room Perfect, which I have followed in the past call for placing the microphone at "random" room positions and orientations with respect to the speakers after the initial measurement at the listening position. That is NOT the way I set it up this time. I should note that Lyngdorf admits these days that if you have an acoustically treated room (as I do), you can avoid having the Room Perfect correction end up with excess highs by always aiming the microphone between the speakers regardless of the "random" positions of the microphone within the room.
For my current Room Perfect set up, I put the front tip of the microphone where the center of my head is between my ears when I'm in the listening chair. I pointed the mic level and straight forward to the point on the wall behind the speakers, midway between the two speakers. I did not move the microphone for any of the measurements. I started out with the volume set at minus 30, but Room Perfect said that was too low and to set the volume at minus 12 dB. That was quite loud, but seemingly safe for the speakers. I was running the measurement from my computer desk outside the listening room, so the room was empty of people and with the door to the listening room shut (my usual way to listen when I'm in that room) it was not loud at all outside the room. Room Perfect told me it had 100% room knowledge after the Focus measurement and one room measurement, but I ran two more room measurements anyway, again not moving the mike. After the third room measurement (a total of four measurements including Focus), Room Perfect said I was done and should exit. The entire Room Perfect measurement process, including setting up the mike, which is the most time and detail intensive part, only took about half an hour.
In walking around the room, I hear not much variation in bass level with Room Perfect set on Focus. I worried that it might sound too bassy outside the listening postion, but that is not the case.
So I guess my effort to "fool" Room Perfect about how to adjust the response worked. I love it when a plan comes together! I will not be going back to the Lumin/Benchmark equipment!
Let me add that before purchase I was aware of the less-than-stellar measurements of the TDAI 3400
reported by Audio Science Review (ASR) and some others. I was also aware of the stellar subjective reviews from other sources. I also note that ASR at least partially recanted once the author heard the results of Room Perfect on his own home system, then
giving the 3400 his recommendation.
Before purchasing my Lyngdorf TDAI 3400 I also heard a friend's TDAI 3400 set up with the Graham Audio LS8/1 speakers and was quite impressed. Now, having heard the 3400 in my own room, all I can say is that whatever objective flaws the electronics may reveal on the test bench, the Lyngdorf TDAI 3400 yields subjectively amazing results in my listening room.
A picture of my newly further simplified system is attached. Note that this system is much closer in configuration and price to the type of system Bill Watkins uses to demonstrate the Watkins speakers at his retail store. I estimate the total cost of this newly simplified system at about $15,000, including all the acoustical treatment and electrical tweaks.