4645 DIY sub

[caladois]

For my project I am looking for plan and shematics of this sub. I need the internal quotes...
Thanks for yopur help. Is there a difference between the cabinets 4645a, B and C (excepted the speakers) ?

[stephane RAME]

http://www.jblpro.com/pages/cinema/lfsub.htm
http://www.jblpro.com/pub/cinema/4645c.pdf
http://www.jblproservice.com/pdf/Theatre%20Series/4645.pdf

[hmolwitz]

Looks like a different cabinet tuning somehow, same driver, same internal volume, both tuned to 25hz per the literature.
4645B rated to 18hz down 10DB
4645C rated to 22hz down 10DB.
Go figure, 2 ports vs 1?

[pos]

I think the tuning is supposed to be the same in all versions, despite the different number of ports, even thoses with a 2242 instead of a 2245.

The box volume and tuning is the same as the B460, and also the same as the 8 cu ft box 1983 article. It is tuned to 26hz and requires some boost at that frequency (a resonant high pass filter), ala BX63.

http://www.lansingheritage.org/html/jbl/reference/technical/1983-subs.htm