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RE: where to buy more efficient 5" driver for book shelf speakers?

(I'm one of the Bottlehead guys but I'll just talk about speakers here, OK?)

In the simplest analysis, to get the same bass extension the box internal volume is proportional to efficiency - that's why efficient speakers are so big. So substituting a more efficient speaker will leave you with less deep bass.

In the more complex analysis, each speaker has a limited range of box volumes that can be made to give a flat bass response, even if you accept a higher cutoff frequency as the price of greater efficiency. So for any given more-efficient speaker, you may or may not be able to get flat bass response.

I did a quick simulation as an example; it appears that you could use a Fostex FE126E and shorten the port to about 1" long. The bass will be a little lumpy but not terrible. Different speakers will give different answers though!

Hope that helps.

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