Let us know ..how well the Bose bass modules replace the double 18's...

Most folks don't have a clue...there will be a massive difference in bass..

There must be experienced sub woofer people here that would know what I am talking about..I have played outdoor venues with big sound coming from 18's....No way will you get the same coverage from L1's...

Of course it could be overkill for your venue (18'), and the L1's could do the job...but they are different as night and day..