JBL sub bass project design

[JBL 4645]

I need dimensions for exact size for a 15” JBL 2225

http://www.lansingheritage.org/images/jbl/specs/pro-comp/2225/page01.jpg (http://www.lansingheritage.org/images/jbl/specs/pro-comp/2225/page01.jpg)

http://www.pispeakers.com/JBL_2226.pdf

I need only to have a signal port centred above the driver similar to the JBL 4645C.

I’ve checked out costs for 18mm MDF with cost approximated at £45.00 pounds, excellent.

Now all I need to know please, is how low can I get this to go to within technical tolerances.

[JBL 4645]

I’ve been doing secondary research. What is the size is port size of the JBL Synthesis sub.

http://www.jblsynthesis.com/images/products_small/S2S.jpg


GeneralSensitivity (2.83V @ 1m)94dBImpedance8 Ohms Bass Driver15" Shielded conesPower Rating250 Watts Frequency Response25Hz – 80Hz Dimensions (H x W x D)27-1/2" x 21" x 15-13/16"
699mm x 533mm x 401mm Weight110 lb/50kg