Hi all,

According to this post, the original (DD55000) Everest had a bass enclosure volume of 180 litres + 27 litres = 207 litres, and an "effective volume" of 227 litres (8 cubic feet) when taking into account the ports.

Yet the JBL Professional enclosure guide states that the enclosure volume for the E145 (and several other JBL drivers, including the 2225) should be 4 cubic feet; i.e., half the actual volume used in the Everest.

Can someone please explain the discrepancy?

Apart from curiosity, the main reason I ask is that I am having a ported enclosure built (initially for a single 2225H, but I may upgrade to a different driver at a later time) and I am trying to determine the optimum enclosure volume to use...

Thanks in advance!

Richard