Civility, at times, is overrated.

I already told the make/model & where to buy the same sub to that member who first asked me in my PM.
That's nice (though, apparently false), but it's not an answer to the question of why it must remain a secret on this forum. If you'll reveal the details in private, why not do so in public? That which is not made public is kept secret.
You don't seem to know the knowhow of making a cheapie sub sound supertb & deny me of my ear/hand on experience in subs, why bother to ask me?
On what basis do you make the assumption that I lack such 'knowhow'? How did I deny you of anything? I simply posed a challenge. When you infer what I did not imply, you are putting words in my mouth.
If YOU did read my post carefully, I stressed so much on propery INTERPHASE with the preamp which can make a lousy sub sound excellent as I have done so. It is not so much how much money you want spend on a sub, the key issue is, again, to interphase yr stereo preamp PROPERLY to get the result.
I believe you mean INTERFACE, not INTERPHASE. I don't have an interface issue. It is, by your own statement, you who have such a problem. Are you honestly suggesting that proper impedance matching is all it takes to get astounding results – even from a lousy (your word) sub? I guess I wasted a ton of money on bass traps.
May I ask you: how many & what subsonic bass recordings you got to test yr subs???
I have lots and lots of such recordings – far too many to name, but take Liquid Tension Experiment's 'Chewbacca' for a ride for some butt kicking bass. I don't understand the pertinence of this question.
Price tag is not the only means to get a superb sounding sub. It is the proper interphase between the preamp & the sub & the music softeware to back it up.
Okay, we're back to this 'interphase' issue again. My subs are being fed by a crossover. My mains are being fed by the same crossover. I have no impedance mismatch – output to input impedances are well within ideal operating ranges. I don't have a sub; I have two and I'm contemplating a third because, as satisfying as things are, I know they can be even better. As far as the music is concerned, I have a plethora of titles with incredible bass.
Proper setting up of a sub, which I did not mention in my above post, is something not to be overlooked.
Ah, but that's elementary, my dear Watson. I have invested a great deal of time, energy and, yes, money in maximizing my setup. You seem to be assuming otherwise, except on that last one.
Now I can make a $45 sub shake my basement audio den, any costier counterparts are only icing on the cake - if one really knows the business.
Good for you! Of course, shaking is easy. If that's all you want, just attach a shaker to your chair and be done with it. We still don't know what $45 sub you have. I guess I have lots of icing on my cake. Oh, I guess I don't since I obviously don't know the business.
What I do know is that I don't just want to be hit in the chest with pressure; I want to hear notes. I don't want hard hit notes to over-bloom and resonate in my room. I want them decay properly.
Your assertion, as I read it, is that those of us who have invested deeply in the bottom end have wasted our money. Furthermore, we did so out of ignorance, because anyone who knows the business could have achieved that end for less than a restaurant bill. Sorry, but that's utter nonsense.
Now, I am not insisting that I have the ultimate bass setup, nor am I suggesting that my approach is the best, or the only one to take. I am making the claim that it works to the extent that I (and I assure you that I'm very demanding, as well as cultured) am impressed with it – no more, no less.
Put down your sticks and stones - maybe give a listen to the penultimate song on Joni Mitchell's 'Clouds'. Nobody in this thread made an issue of the money spent beyond responding to the query (oops, different thread, but still...) of how much we actually spent - no value judgment. You drew that pistol. I'd rather not have to return fire.