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Fountek FE85 3" Full Range Speaker Driver
What would be the optimal length for a 1/4 wave cabinet tuned as low as practical for this driver?
In basic terms the length of a 1/4 wave pipe or cabinet is roughly 1/4 the wavelength of the driver Fs, in this case about 27".
Date published: 2014-04-30
I'm trying to do some calculations for some electronics. One of the variables is Lvc (Lvc is the driver's voice coil impedance [mH]). What is this number for this driver? If this is something I can measure myself, how?
Lvc is voice coil inductance, also labeled as Le. This drivers Le is 0.565 mH at 1kHz, measured with a WT3.
Date published: 2014-05-30
i NEED to know what is the magnets diameter?
The diameter of the magnet is 70mm (2.75")
Date published: 2014-02-03
What are the dimensions of the box and the port is optimized for 70 Hz?
There are an infinite number of combinations to achieve what you want. Perhaps something like:0.1 ft^3 with a 1" x 3.5" round portThis could be be a box that is 7"x5"x5", internally.-or-Make a 6" (external) cube out of 1/2" MDF and use a 1" port that is 3.75" long.-or-Make a tall skinny box with internal measurements of 4"x4"x8" with a 3/4" round port that is 2.75" long.Truth be told though, 70 Hz is not a good tuning frequency for a standard bass reflex box with this driver. The output of the driver drops too drastically below 125 Hz to have it blend smoothly with a port resonance at 70 Hz. Plus, there won't be much output at 70 Hz to resonate anyway, in fact it looks to be about 13 db lower than the quoted sensitivity.Some transmission line wizards may be able to get some okay low end out of these, but I don't think a standard ported box will get you good extension that low.My advice would be to look at some other full range three inchers, like those from Tang Band that have better low end extension, or just go with the PE recommended box specs and the 94Hz tuning. Any way you go, there will not be a great deal of bass output from a 3" driver, so you may want a subwoofer no matter what.To get a 0.5ft^3 box with a 94 Hz tuning, a 4"x4"x6" box (internal) with a 3/4" port that is 2.15" long would work well.Oh, a word of advice when using a full range woofer, make sure you put something on the inside of of the box to break up internal sonic reflections. Otherwise midrange and lower trebel frequencies will be reflected back through the cone making the speaker sound shrill.
Date published: 2014-06-09