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Author Topic: tech advice please  (Read 764 times)
broKen
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« on: August 29, 2013, 10:38:41 PM »

Been thinking of building a cabinet to link to my amp, capable of 150 watts. It's a genz benz compak 300. Small and convenient. What would you do?  Could I use 12" speakers intended for bass amplification?  Thanks for any advice.
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Barefoot Rob
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« Reply #1 on: August 30, 2013, 01:31:16 AM »

I would go with a full freq. speaker not a bass speaker.Something that would go into a PA but they're for the most part 4ohm speakers.
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broKen
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« Reply #2 on: August 30, 2013, 02:59:13 AM »

Thanks Rob, that helps.
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L07 Shooting Star
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« Reply #3 on: August 30, 2013, 05:06:40 AM »

A 12" speaker in a closed-backed ported cab properly tuned would make a fine extension speaker for you amp.  1 - 12" speaker in the proper cab is plenty good enough and wouldn't be too big or heavy.  Get a good quality musical instrument speaker designed for electric guitar that will handle the watts you are looking for.  JBL, Jensen, ElectroVoice, Celestion, and many other companies make good speakers for this application.  You can sometimes find used ones on Ebay, Kijiji, etc.

The cabinet has to be properly designed in terms of internal volume and constructed properly as well.  There is lots of info available online regarding cabinet design.  The speaker manufacturer's websites are a good place to start.  They have charts and good references to get you started in the right direction.  Take some time to understand speaker theory.  It's worth the effort.

Here are a few links you might want to investigate.
http://www.electrovoice.com/family.php?id=72
http://www.electrovoice.com/downloads.php?type=PA Bible
http://www.hometheatershack.com/forums/enclosure-volume-calculator/
http://www.jblpro.com/products/vintage/index.html#TourSound
http://www.jblpro.com/index.html
http://www.bcae1.com/spboxnew2.htm

I have built 2 such 1 X 12 cabs.  I cheated a bit as I used an old Fender PA cabinet and cut it down to the correct size for the design I wanted.  But years ago, in 1985,  I built 2 full range ( 3-way)  PA speaker cabinets from scratch using plywood and radio shack components that I still use today as my practise PA system's main speakers.

If you go the route of building your own, you may not necessarily save any money, but it is a very rewarding experience the first time you fire those babies up.

There are a couple of older threads desribing my 2 home built 12" cabs, but I'll be dern'd if I can find them right now.  They sound awesome by the way.

PM me if you want some more ideas.

Kurt
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broKen
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« Reply #4 on: August 30, 2013, 05:35:46 AM »

Thanks Kurt, that should put me well on the way. I have considered just buying the genz benz cab designed for the amp, but for $350, and kinda hard to find, well I opted for DIY. Thanks
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