I rebuild old amplifiers in my spare time I have been repairing car audio equipment since 1985.
Just a little help for the people that care. The most Important thing you can do to get great bass is build the right box for your speaker. A properly ported box can add 3 decibels to your bass output.
The port allows sound inside the box out where you can hear it .It is tricky getting it just right because the port has to flip the signal so that it is in phase with the sound coming from the front of the speaker.
I am glad to join your group hopefully I can help a few of you get the best sound possible. Remember its not how many watts your amp has written on it but what the system sounds like that counts.