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Old 9th March 2006, 03:48 PM   #1
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Default Cheap sub

I am looking for a cheap sub for stereo use. I was hoping to source all the parts from Parts Express.

My application is with a Yamaha RX rated around 70 watts/channel with existing Klipsch bookshelves. I merely want to augment the bass. I want an 8ohm setup so I can run it from the second set of speaker connections. The system is set up in a large room, and its for background music. But the bass from the Klipsch does not do it for me, and I figured building a simple dual voice coil non powered sub could be a cheap option.

They have the DC300-8 12" classic woofer, but its not dual voice coil, so I was not sure if that was a good option for a sub to use as a stereo. I also want to source the cabinet from their limited collection and am not sure which driver is a good match for their 2.0 cu ft. cabinet.

I admit to being lazy and and looking for for the easy solution.

Any ideas?
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Old 9th March 2006, 04:18 PM   #2
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The DAYTON SD315-88 at $40 looks like a good option.
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Old 9th March 2006, 05:34 PM   #3
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Michael,

One of the things about a passive sub is that you need a crossover. The caps and coils are quite expensive and might even be more than the driver. If it's in the budget you might want to consider a plate amp. It has the crossover built in and it allows you to use a single VC driver. It also allows you to change the level of the woofer to suit your tastes. It's not that much more than what you were looking for and I think you will be much happier in the long run.
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Old 9th March 2006, 05:49 PM   #4
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Are plate amps better choices for sealed passive subs?
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Old 9th March 2006, 05:58 PM   #5
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Parts Express sells a 25watt plate amp for $40 (15watts RMS @ 8ohms).

That could work for this application. At most I need 85 Db of output from a sealed sub, I bet that would do the trick. It would also give me speaker terminals, a crossover and avoid the need for a DVC as well?

The other option is a 70 watt (45 @ ohms RMS) plate amp for $50 (Dayton SA70).

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Old 9th March 2006, 10:05 PM   #6
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Methinks you are warming to the idea. Good, I really think you will be happy. I would go for the 70 watt. I have two of them and am quite satisfied.

At that price it's almost cheaper than caps coils and terminals.

Yes a single VC is all you need, the amp will bridge the channels for you.

Plate amps can be used with sealed or ported. A plate amp makes a passive woofer into an active one.
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Old 10th March 2006, 03:00 AM   #7
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I know you wanted to go partsexpress... but for a better deal on the amp you might want to check out http://www.mcminone.com/product.asp?...Fid=50%2D6266A

I've had great dealings with both MCM and partsexpress and have been satisfied with their serivce, price, and product.
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Old 10th March 2006, 03:44 AM   #8
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MCM also sells a cheap woofer that Bill Fitzmaurice uses in the Autotuba and Tuba 18. These are horn subs and they are terrific...

check 'em out

http://www.billfitzmaurice.com/plans...37820511439fa1
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Old 10th March 2006, 05:30 AM   #9
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Take a look at Ascendant's assassin series of subs:
http://www.ascendantaudio.com/assassin_page.html
For the money, you really cant beat these when your on a budget.
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