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Built box too big, how to control excursion?
Built box too big, how to control excursion?
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Old 11th October 2009, 05:43 AM   #1
Jameson Styles is offline Jameson Styles  United States
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Default Built box too big, how to control excursion?

In my early days of audiophilia, I bought a 10" driver at my local surplus store for $25. No specs on it, AT ALL, not even a real rating on impedence. However, it has amazing excursion, a 2" or so voice coil, and a big honkin 45oz or so vented magnet, and a roughbacked poly-coated cone. When I knew nothing of speakers, I was SOLD.

However, I have now learned the ways of thiele/small. I know that high excursion drivers need big boxes. So I tore this driver out of the too-small box I built for it before and built a new, bigger box for it. About 1.5 cu ft.

At first I was amazed by the performance. It was smooth, deep, and the box rumbled just enough to tame any response peaks. It was just a lovely little subwoofer, powered by a 60w plate amp. However, on higher volumes, bass drums make the woofer go beyond xmax and clip, making that kinda "poof" sound.

So I wonder, what can I do? I think I built me box too big. I've already insulated three internal sides with fiberglass, would insulating the other two help to dampen out the overly low-lows that make it overdrive, or do I need to stuff it with pieces of 2x4 to reduce internal volume? I'm open to any suggestions.
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Old 11th October 2009, 05:54 AM   #2
planet10 is offline planet10  Canada
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Location: Victoria, BC, NA, Sol III
Built box too big, how to control excursion?
More damping will make the box seem bigger.

Try putting some bricks, chunks of wood, full paint cans, whatever into the box to see what happens....

I suspect your amp may be clipping thou.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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