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Cheapest Speaker Amp - Page 2

post #16 of 23
10/13/11 at 10:33pm
Thread Starter 

My mom's work has got some **** old computers so I was hoping to steal some 200watters and recycle the rest. So I need to find a PSU thats like 200w ish and daul rail? How do I tell how many rails it has?

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post #17 of 23
10/13/11 at 10:52pm

The best you're going to get from a computer supply is +/- 12VDC, which seems to be below what others are saying you need for a gain clone (I quickly pulled up one example that showed +/- 35VDC).

 

It's probably switching, might have a funky ground scheme, might require modification, the -12V rail might have a lower current rating than the +12V rail, as well as many other unforeseen issues.

 

Power supplies aren't that difficult to build, nor are they that expensive.  You also get to build exactly what you need, as opposed to jury-rigging.

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post #18 of 23
10/18/11 at 6:29pm

If you're lazy you could buy a Lepai LP-T2020A+ 2 channel 20W RMS 80W Peak speaker amp from partsexpress.com.  They are $24 I think.  They are actually a huge bang for the buck.  I use one to power a pair of DIY studio monitors that I just built today.  Its rated at the high-fi international standard which you'd have to look up.  For the price, it sounds pretty nice -- and by that I mean it does its job.  There is a bypass switch so you can completely bypass the EQ section of the amp because we all know that affects SQ.


Edited by wdahm519 - 10/18/11 at 6:30pm
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post #19 of 23
10/18/11 at 8:59pm
Thread Starter 

Thanks for the suggestions! I'll go check out some garage sales and ill check out the parts express amp too. Thanks

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post #20 of 23
10/21/11 at 8:46am

try this amp kits(it cost around $35)

http://www.vellemanusa.com/products/view/?id=350530

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post #21 of 23
10/22/11 at 5:50pm
Thread Starter 

http://www.shopgoodwill.com/auctions/Yamaha-Natural-Sound-Stereo-Receiver-Model-R-3-8788017.html

 

Anyone know if this is a good buy? About $20 shipped. I found out that my speakers have to run through my sub and the system is 8 ohms. I'm going to reterminate them with RCA right now its just clamp style. Or should I terminate with banana plugs?

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post #22 of 23
10/23/11 at 8:54am

RCA is fine.  That's what I use on my speakers.  Speakers are usually 8ohms, and unless it says on the driver or the back of the enclosure (if they're store bought), it will almost definitely be 8 ohms.  That receiver looks okay.  Its probably not a bad deal.  I'm not sure how it will sound though, considering its just a standard receiver.  It will probably have okay sound.  A DIY amplifier would be the best bet for sound quality though. 

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post #23 of 23
10/27/11 at 1:21pm

There's this:-

 

http://www.ebay.co.uk/itm/MKll-Tripath-TA2024-fully-finished-tested-pcb-2x15watt-/260866038862?pt=UK_AudioTVElectronics_HomeAudioHiFi_Amplifiers&hash=item3cbcd3dc4e#ht_4588wt_1165

 

or this:-

 

http://www.ebay.co.uk/itm/2-15-watt-4ohm-TA2024-D-class-Audio-Amplifier-Board-/350500691971?pt=UK_AudioTVElectronics_HomeAudioHiFi_Amplifiers&hash=item519b782003#ht_2683wt_957

 

...plus a 12V wallwart or other DC supply, you'll have to rig up a volume control and box everything.

 

There's a big thread on diyaudio.com with recommended mods for the second one.

 

It's not very high power so it's best with efficient fullrange speakers. It depends a bit on where you live. If it's the US, then a pair of Audio Nirvanas from commonsenseaudio.com paired with this will give you high-end performance for very little outlay. You'll have to box the speakers too, so it's a semi-DIY project with a high likelihood of success.

 

w

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