While I agree with most of whats said here so far you have to realize that the 8" driver in your ML's can only go down so far. More power (but clean) from a great amp may bring you down lower than you are now. You do not memtion your amplifier so I cannot comment on whether changing it may make a difference. For the longest time I had a pair of Acoustat Spectra 11 speakers that also had a 8" driver. I found a big difference when I went from my older Bryston 3B (200 w/ch @ 4 ohms) to a Bryston 4B-ST (400 w/ch @ 4 ohms). The bass was even better as well as lower - more control. But I return to the fact that your model's 8" driver is the most limiting factor. IMHO, move up the ML scale or bring in a good quality sub. Tne sub may well be your least expensive option.
Is there an alternate to Martin Logans?
I love Martin Logan, the way they sound except for two things, my aerius i don't play loud enough and don't go low enough, is there anyway I can get these two things without going to a bigger Martin Logan, do other dynamic speakers exist that have the speed and transparency and pin point imaging of a Martin Logan?