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post #1 of 6 Old 12-19-2012, 11:28 AM - Thread Starter
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I keep finding ways to make more stuff...

So in the bedroom I set up a pc to stream content from the server, and it's using the led tv's speakers for sound. Well my girlfriend and I got a treadmill and we use it to stream stuff while were running. You have to crank it to hear it over the treadmill, and she says, "god that sounds awefull!" Looks like she's becoming spoiled, because your average joe would just deal with it :P

So my goal is to make a pair of super cheap, sensitive, 4ohm bookshelves that can run off of a small amp. They need to get pretty loud with low distortion to overpower the treadmill sound. I wanted to keep it under $100 so diy might not even be an option at this point... but cheap retail speakers are usually 8 ohms. I tried craigslist, everyones selling their crappy old receivers for too much money.

So I have this to start:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=300-380

It can handle a 4ohm load, and it looks like it can put out a real 10 watts with low distortion. That should get the sten II's just shy of 100db without distortion. Problem is the amp + the sten II's are a little over budget.

The only thing that concerns me is that there aren't any settings on the little dayton amp, and I'm afraid it won't add any bass to the sten II. There are probably some equalizer apps I can use on the pc to boost the low end, but that may just suck up all of this amps power and cause distortion. I'm a bass head so if there is no bass it'll disappoint me. I figure they have to better than your regular best buy bookshelves having a total of 4 midwoofers, maybe some good 50 to 60hz output if I'm lucky and if the amp will deliver it.

Thanks for reading my book smile.gif
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post #2 of 6 Old 12-19-2012, 11:59 AM
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Build a pair of Encore speakers and you will love em!!!


http://www.parts-express.com/projectshowcase/indexn.cfm?project=Encore

http://www.41hz.com/forums/showthread.php?3662-Boom-box-build






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post #3 of 6 Old 12-19-2012, 10:56 PM - Thread Starter
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That looks like a decent design and I'm a huge dayton fan, thanks. It looks like it's 8ohms though, but I don't see a mention of sensitivity so maybe it would still work. Since I'm using such a small amp I don't know if an 8ohm speaker will cut it. I'm still leaning toward the sten II pair unless someone can steer me in a different direction. I might just wait a little while and get a decent 2 channel amp that's stable at 4ohms and then build the sten II's. I guess the cost of the amp is my main problem, I'll keep lurking CL for someone that's not trying to sell a htib amp for a $100.
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post #4 of 6 Old 12-20-2012, 12:43 AM
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Why not just take a pair of drivers like like this, and put them in large'ish ported boxes. As long as you place/mount them right up against the wall you won't have to worry about lack of bsc, and if they're at ear level when on the treadmill response should be solid.

http://www.parts-express.com/pe/showdetl.cfm?partnumber=292-548

A 14" W x 22" H x 12" D enclosure, with a 2.5" x 5.5" port will get you approximately 1.5 ft3 tuned to 35hz

(cut this down to 5.5")
http://www.parts-express.com/pe/showdetl.cfm?partnumber=260-478

Individually you're looking at 100 db with 5 watts (a pair should be close to 6db more), and should have punchy bass with the slight emphasis centered at 100hz



You wont be able to go much louder then this without heavy distortion, so if you need something with higher output you might just consider a pair of cheap PA speakers.
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post #5 of 6 Old 12-20-2012, 07:22 AM
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http://www.41hz.com

That boom box post I had above is using an AMP-6 amp. 46 bucks or so. The thing sounds pretty amazing with the Tripath chip and puts out 25 watts/channel. Fills a room with excellent sound. 41hz is some good stuff and they have a # of options for amps. Total DIY material. The forum of the product is excellent with lots of help. Fun stuff.

That boom box I have above sits in the corner of my kitchen and i just plug a MP3 player into it. Anything using a walkman jack with a volume control. That amp you have... What will it put out into 8 ohm?
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post #6 of 6 Old 12-20-2012, 08:52 AM - Thread Starter
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It doesn't say, but my guess would be 4 or 5 watts without distortion.
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