15" Eminence delta help

OK guys, I have questions.  I have aquired 2 subs to use for a small PA system with Yamaha 15" 2 ways for tops.  The subs are ported, 24x24x24 (approx.) with the front port size of 4.5x24. The woofer is a 'like new' Eminence 15" Delta.   This is how I originally inherited these cabs.  Is this the optimal size of the port?  Will batting help?  if so, where inside the cab?  Am I wasting my time?  There is a 500w plate amp which is pretty loud.  I just want to optimize the sound quality.  Again this will be for small venue for dj's or pa rental.

Thanks!

The Delta15 is an absolutely useless driver, especially for PA subs.  That's where you need to look first of all in terms of improving sound quality.

Yeah, basically delta are more towards the budget end of things. At a guess i would say that things are fine how they are and the cab is probably already optimised for that driver, If you want to check yourself then download winisd, there is a help file at the beggining of the newbie section. It a program that will let you model different cabs and it will tell you the theoretical frequency response, sensitivity, and other stuff.

bloody hell.. THATS the shortman mini scoop!

The design is like the one pictured here http://www.diysubwoofers.org/tls/ The cabs look like home made.  I'm trying to salvage whatever I have. 

Edited by levendes - 27 March 2008 at 4:50pm

Thanks for your response guys.  I swapped the Eminence woofers with the Gauss woofers and added some batting along the back side only and it sounds 2,000% better.  I guess the guy who built them didn't know that there is a difference between 15" speakers.