Dead Simple Trick to get More Bass from a Woofer / Subwoofer

I say "dead simple" and that's true - it doesn't take much to glue a weight onto a speaker cone. But there is a lot of work that goes into figuring out how much weight to add. And what that weight will do and whether it's worth the tradeoff.
All of this will be old news to more seasoned speaker builders; there's nothing new about this method. But since I considered doing it for the four woofers I have, I thought I'd make a quick video explaining it.
The added mass lowers the Fs (resonant frequency of the woofer) but also make it harder to drive. You need more power to get the same level of output (spl). Also, if the woofer doesn't have a long enough stroke (Xmax), it may not be suitable for this at all. The lower the woofer plays, the longer the stroke needs to be to avoid audible distortion or damage.
In the end I decided to use the woofers as designed after a break-in period that loosened up the suspension. New drivers (even ones that are 10 years old...) will loosen up over time from being used, and that break-in speeds that up so that you can get more reliable test data.
The speakers I'm building will be in two section - a subwoofer on the bottom with three-way speaker on top. The subwoofer will have two of these woofers in each box in an isobaric arrangement. The chief advantage that isobaric gives you is that it cuts the size of the box in half. It really only makes sense to do it when you have a situation like I have where I have 4 woofers that can be used.
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Category : Doublsmm

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