F3 and Fb significance - Realm of Excursion



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Old 06-26-2012   #1 (permalink)
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Default F3 and Fb significance

Hey,

I'm in the middle of deigning an enclosure for a Audes 75w104-8. The subwoofer would be used in a room. The room itself is about 40 cubic meters and in the shape of a rectangular prism.

Here is what I've come up with so far :



The parameters for the driver are as follows:

10''
8 Ohms
RMS: 130 W
Max: 200 W
Range 30 - 2000 Hz
Sensativity (2,83 V/1 m) 92 dB
Fs 31 Hz
Mms 37,5 g
BL 12,37 Tm
Q ms 2,83
Q es 0,31
Q ts 0,28
V as 100,5 ltr

This driver is also available in the latest BassBox pro 6 database with all the parameters.

Now is the fact that my F3 is higher than the Fb a problem? Are my F3 and Fb too close to each other? Are they too high at the moment for good SQ? I'm looking more for SQ than SPL.

Any assistance would be great. Thanks.
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Old 06-26-2012   #2 (permalink)
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Default Re: F3 and Fb significance

you are losing output very quickly below 40 hz there. f3 is typically below the fb but not always. try raising the volume and tuning lower. if you plan on using it for movies more so than music i would tune in the mid 20s, if its music id go near 30. the lower tuning will yield a flatter response much further down in the spectrum
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Old 06-26-2012   #3 (permalink)
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Default Re: F3 and Fb significance

Well you should also note that the diver is 10'' and a bigger enclosure is probably not a good idea. Other people actually recommend 45L for this driver. That however only raises the F3 and Fb. Never heard anyone going over 60L.

Don't even know what to do anymore.
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Old 06-26-2012   #4 (permalink)
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Default Re: F3 and Fb significance

try just dropping the tuning then. that will drop the fb to something more reasonable. 37 hz is a very high tuning imo

just looked up what 55 l is and you are right, that is very large to begin with. the fs on that driver is pretty low, so i dont see any issue with it being tuned low. the location of the box will help output down low as well if you load it against a corner for example. that is stuff the wont be modeled. overall, 50-55ltuned to 28-30 is my suggestion if you want sq and low extension
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Old 06-26-2012   #5 (permalink)
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Default Re: F3 and Fb significance

Believe me I'm trying. Changing the volume of the box, the circumference and length of the vent.

Once I get the tuning down to the mid and low 30's the F3 goes crazy and up to like 60 Hz.
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Old 07-08-2012   #6 (permalink)
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Default Re: F3 and Fb significance

Can anyone explain to me what an "Active 12 dB/oct. HP Filter" is ? If I add that it seems to magically fix all my problems. The F3 goes way down to like 32 Hz and the graph looks much better. What's happening here?
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