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kvk 5th April 2008 12:19 AM

tapered expanding port for EV Marquis

This Marquis design has a port that's 6.5" long and expands from 25in^2 to 75in^2. It's kind of like a horn.

I ran the calculation from the old EV sheets for the driver I have and what is interesting is the port comes out to 50in^2 at 6.5" long for a 6000in^3 enclosure. That's interesting as the volume works out exactly the same as a linear tapered port for 25in^2 to 75in^2.

So, I was think of building this enclosure to original spec just as a fun retro project. I'm wondering if the tapered spec has any detriment or benefit. I'd build it to spec unless there's a strong reason not to.

GM 5th April 2008 01:38 AM

Big vents tend to be one note honkers if not broken up into many smaller ones such as done on the Jensen Ultraflex/Onken. The taper smooths its response a bit over a wider BW.


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