System that sounds so real it is easy to mistaken it is not live

@lewm , I was not trying to give you a lesson on TL design, Just my opinion. I have heard some excellent TLs from Celestion back in the day and more currently Sanders also under an ESLs!   MDf is OK for a woofer, but not for a subwoofer actually plywood used intelligently is stiffer just a lot more expensive. My balanced force subs use 1.5 inch cabinet grade maple plywood.  IMHO it takes an entirely different approach designing a speaker that can punch out the appropriate energy from 18 Hz to 125 Hz. It is not my opinion that speakers that can do so will get your entire house shaking. This is a matter of fact. Turn it up to 90 dB and and play pure sine wave test tones from 20 to 40 Hz and walk outside and you will hear, at many frequencies, your house rattle and buzz. I have a brick house with some Hardy Plank siding in the rear and it rattles and buzzes, not to mention everything in the house like plates and wine glasses. It took me a month of playing around to stop all the sonic anomalies coming from a Stewart theater screen and they reputedly make some of the best. I had to silicone all the air vents in the house to get then to stop. At least in my media room I can not hear any of the symphony the subs are making in the rest of the house with the volume up. I think this is the best one can expect with subs that have that kind of energy. Balanced force subs may not shake themselves but this says nothing of the rest of the house and it's contents. My only possible thoughts in situations where someone is telling me their environment does not rattle are, the person has no idea what they are listening to, the person is very clever and managed to control their environment via various techniques and finally, their system does not produce realistic sub bass. The specifications of the vast majority of speakers means absolutely nothing. The speaker's ability to make sub bass at one meter says absolutely nothing in regards to the speaker's capability to make realistic levels in a normally sized room. It is the main reason we resort to subwoofers. The problem for most manufacturers is that making an ultra high performance subwoofer requires a level of construction insanity and equipment support that the sub becomes very uncompetitive from a cost and complexity standpoint. They want to sell subs to as many people as they can. Us truly discriminating audiophiles are not a very large target audience. As I have said in other posts, the only sub I have heard make great sub bass in a normal room environment  is the smaller Magico Q sub and for some reason they do not make it any more. I also think their Q sub were not the absolute sound. I still think the basic design can be better, even less cost effective but better. 

I have a Lenco L78 with an Ortofon AS-212 tonearm. It has an SAE 1000LT cartridge that is comparable to a $1K cartridge. It is a HOMC. I use Revel Performa M22 speakers with a tweeter upgrade. I use a rebuilt and upgraded Pioneer SX-34 with best tubes. It does sound live to me.

I fully agree that TL bass is not suitable for your particular goal unless you have room for truly massive cabinetry. I’m getting what bass  I want with what I have. You ignore the fact that I used HDF, not MDF, and that the cabinets are further damped and weigh about 120 lbs each. Beyond that a TL design does not absorb much amplifier energy in the first place.  But again, your after something I don’t care to pursue.