Bogen SCW-20 drivers - useful? - diyAudio
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Old 13th May 2009, 09:29 PM   #1
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Default Bogen SCW-20 drivers - useful?

I have a pair of junked Bogen SCW-20 sound columns, and I'm curious about the usefulness of the drivers as small FR drivers. Specs that I could find are here (not much info, though):

http://www.bogen.com/products/pdfs/f...dfs/SCW20s.pdf

Freq Response is stated as 80-14k, 100 dB efficiency. The drivers are each marked as 8-ohm, directly measuring 7.3.

The cones are paper, and I have eight of them, so experimentation is in order. Any thoughts, experiences, suggestions appreciated. I was thinking something like slightly larger-than-normal computer speakers. Those MLTL things look interesting, though it's a new approach for me. As for abilities, I do have a pair of BLHs with Fostex 168Sigmas, and I built those from factory plans. My construction and woodworking skills are still fairly beginner level, though (amazing what some sanding and that stone-speckle paint can do to turn bad right-angle corners into swell rounded corners).

Bass support will probably be needed, but for computer-speaker purposes I'm not hugely worried about it.

Thanks.

- Jay
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Old 13th May 2009, 10:10 PM   #2
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Oh yeah-- they're billed as 5-inch drivers, but 4.5 inches is more accurate.
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Old 15th May 2009, 11:33 AM   #3
gaust is offline gaust  United Kingdom
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A good starting point is measuring the DC resistance with a simple multimeter - however this will not tell you much about how useful the drivers are likley to be.

A more useful setp would be to try to measure the T/S parameters of the drivers. I have used a Dayton Audio Woofer Tester (from Parts Express) which connects via USB to a computer and measures the parameters in a couple of seconds. An alternative would be to see if there is anyone on the forum who lives near you with the facilities to measure these parameters and ask them if they would be willing to test them for you.

Hope this is helpful
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Old 15th May 2009, 11:37 AM   #4
gaust is offline gaust  United Kingdom
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Probably the best way to get an idea of the sound from a single speaker it to make some quick and dirty sealed enclosures (lightly stuffed) of a size suitable for (large) computer speakers and try them where you would like to use them. If this is on a desk you will get some bass-reinforcement from the surface of the desk and you might find that they sound pretty good for near-field listening.
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Old 15th May 2009, 11:53 AM   #5
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Many thanks, esp. for the Parts Express tip. I will check that out-- I had no idea you could measure the Thiel/Small parameters without some kind of factory equipment. I am just getting back into the FR hobby after a seven-year hiatus (I can't believe it's been that long). So I'm a little rusty, but the forum is great for brushing up.
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Old 15th May 2009, 11:56 AM   #6
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Oh, and they don't HAVE to be computer speakers. That's just one possible application. My system is banished to the basement for now, so they could simply be an alternative to my current set-up. That means up to 2 meters or more tall and any footprint within reason.
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