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RE: Ultimate 15 inch driver build.

This happens often, and I am as guilty as the rest what have already posted here. Here's an answer for you:
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The bass driver selected for the Everest was the professional E145. It was chosen because it was the "fastest" bass driver in JBL's inventory. While initially intended as a guitar speaker, its remarkably flat given an underhung voice coil topology and maintains pistonic action throughout its range due to a deep, straight-sided cone. The magnetic motor is oversized compared to other JBL 15" drivers and was based on LE15H. It resulted in a very efficient bass response that would match the target system sensitivity of 100db/w/m. The deep cone was accommodated by an extension ring added to the rim of the speaker basket that was very similar to the 150-4C of the 1950's. Therefore, it was not a complete stretch to label it a 150-4H as was done in the Everest product literature.


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