Cheap sub

MichaelJHuman · 9th March 2006, 03:48 PM

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?

MichaelJHuman · 9th March 2006, 04:18 PM

The DAYTON SD315-88 at $40 looks like a good option.

Cal Weldon · 9th March 2006, 05:34 PM

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.

MichaelJHuman · 9th March 2006, 05:49 PM

Are plate amps better choices for sealed passive subs?

MichaelJHuman · 9th March 2006, 05:58 PM

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).

Cal Weldon · 9th March 2006, 10:05 PM

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.

BassAwdyO · 10th March 2006, 03:00 AM

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.

chipco3434 · 10th March 2006, 03:44 AM

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

PM650 · 10th March 2006, 05:30 AM

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.

9th March 2006, 03:48 PM	#1
MichaelJHuman diyAudio Member Join Date: Aug 2005	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?

9th March 2006, 05:34 PM	#3
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	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. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

9th March 2006, 10:05 PM	#6
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	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. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

10th March 2006, 03:00 AM	#7
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	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. __________________ The golden rule of DIY: Build nice, or build twice!

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9th March 2006, 04:18 PM	#2
MichaelJHuman diyAudio Member Join Date: Aug 2005	The DAYTON SD315-88 at $40 looks like a good option.

9th March 2006, 05:49 PM	#4
MichaelJHuman diyAudio Member Join Date: Aug 2005	Are plate amps better choices for sealed passive subs?

9th March 2006, 05:58 PM	#5
MichaelJHuman diyAudio Member Join Date: Aug 2005	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).

10th March 2006, 03:44 AM	#8
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	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

10th March 2006, 05:30 AM	#9
PM650 diyAudio Member Join Date: Jul 2005 Location: Tennessee	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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