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Old 7th March 2012, 04:01 PM   #1
toobhed is offline toobhed  United States
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Join Date: Jun 2010
Default FAST woofer rec for 6 liter enclosure


I've just finished a FAST speaker where the top chamber of the cabinet is about 3L and has an MA Alpair 6M...that part sounds great. I had a scanspeak 4.5" woofer around so I tried that in the bottom 6L enclosure of the cabinet (cab is divided into separate sealed and lined 1/3 and 2/3 spaces). Here are the specs for the woofer
Scanspeak Discovery 12W/8524G 4.5" Fiberglass Cone Woofer: Madisound Speaker Store

While the optimal xo seems to be around 160hz from listening, I believe there has got to be something to improve the sound...currently the woofer seems very constrained like it maybe in too small a space and doesn't blend well (that could be due 24db/oct xo slope on a pro-audio active xo....though this same xo sounds ok on another FAST approaches).

Can anyone recommend a small woofer that may perform better in a 6L sealed/lined space to go with the A6M? I'll be constructing another baffle anyway. Or, would a back port be an improvement without changing woofers? Thanks folks!

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Old 7th March 2012, 05:01 PM   #2
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Join Date: May 2005
Location: Victoria, B.C.
You'll get some mid bass if you go with a vented box. Predicted response is f3 @60Hz with a 1.5" dia. X 4.75"-5.00" long vent in a 6 liter box.

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Old 7th March 2012, 05:06 PM   #3
toobhed is offline toobhed  United States
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Thanks Jeff, I'll give it a try,
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Old 8th March 2012, 01:48 AM   #4
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Join Date: Aug 2009
Location: North Texas, USA
It's your build, but if you're trying FAST to augment the Alpair, why pick a driver that's bass limited to start? Plenty of inexpensive 6.5 or 7" midbass drivers that will work easily.
I was so much older then, I'm younger than that now.
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