MorboOriginally Posted by morbo!
Friggin amazing is just the start! After one listening session round my place, an audiophile friend remarked that the deep bass actually cured his constipation!
If you are saving up for drivers, I recommend trying the JBL 2245. The Fs of 20Hz would make a good drop in replacement for the Altec 18" I am using.
But be forewarned, these enclosures do require significant bass boost below 60-80Hz to work properly. Consider using 2nd order low pass, centred on 15-20Hz, as in the circuit attached below.
Good luck, and post the results of your project when you get it going
Jack