My years of experience at this tells me that far too many people are searching for deeper bass in their loudspeakers while overlooking the fact that the equipment ahead of the speakers simply is not reproducing the last two octaves down cleanly or transparently. If you get everything ahead of the speakers really working well, almost always you will hear significantly cleaner and deeper bass than you did before from the same old speakers, assuming they were good ones in the first place and that the listening room is decent.
For example, a great speaker like the HT3 will not play clean musical bass if driven by an inadequate source system. The Songtower will go deeper and cleaner than you would believe if the electronics give it a chance.
I invite you all to Jim and my shared display room at the upcoming AudioKarma show the weekend of May 3-4 and I will have something new to say about this that I suspect all will enjoy.
Frank Van Alstine
P.S. The AudioKarma show is in a much nicer venue this year, the Embassy Suites in Livonia, Michigan.