To improve the bass slam, try putting the FMJ 23 on aluminum cone feet and using a respectable power cable. The stock rubber feet snap off easily. Using sorbothane rubber feet takes the liveliness out of the sound, puts too much warmth into the midrange and reduces bass weight even further. I shall experiment with the Black Diamond Racing cones soon.
You may also experiment with speaker placement to take advantage of the clean, unexaggerated bass reproduction of the FMJ23.
You may also experiment with speaker placement to take advantage of the clean, unexaggerated bass reproduction of the FMJ23.