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 Post subject: DIY Stereo Amp Help
PostPosted: 07 Jan 2017, 17:26 
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Joined: 07 Jan 2017, 16:53
Posts: 3
Hey everyone, new guy here. I'm looking for some suggestions regarding a DIY stereo amp kit.

So here's the rundown:
I have two sets of speakers - a pair of AIWA SX-NA302 speakers (rated for 40W and 6ohms) and a pair of Bose Interaudio 4000 speakers (10-100W, 4-8ohms). I would like to build a simple amplifier that can handle all four speakers, has one or two auxiliary inputs (as that's all I would be using), and just a volume knob. Hopefully pretty simple.

Are there any relatively inexpensive kits or from-scratch projects I could make that do what I want, whether they're tube, solid state, etc? Thanks for the help!


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 Post subject: Re: DIY Stereo Amp Help
PostPosted: 08 Jan 2017, 11:06 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
The speaker power figures say nothing so if you have somne figures regarding sensivity, it will be easier to point you in a reasonable direction.
If your speakers are 82dB/W/M you need a BIG amplifier, but if they are 98dB all you need is a single 6AQ5 or 6BQ5 (in single end).

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 Post subject: Re: DIY Stereo Amp Help
PostPosted: 08 Jan 2017, 15:32 
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Joined: 07 Jan 2017, 16:53
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Ok, so what I've been able to find so far is that the AIWA speakers have a sensitivity of 87 dB/W/m. For the Bose speakers, the 10-100W is the recommended amp power (RMS). However, I have not been able to find any listing for them regarding the dB/W/m.


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 Post subject: Re: DIY Stereo Amp Help
PostPosted: 08 Jan 2017, 20:56 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Bose doesn't spec their speakers because it would be a deal-breaker for most. People love them or hate them. They all have one thing in common: they need power and lots of it!

The mantra of, "No Highs, No Lows, Gotta Be BOSE!" comes from underpowering them. Consider them an 18-wheeler... fuggeddabboud a petrol 4-banger, bring on the diesel! :evil:

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 Post subject: Re: DIY Stereo Amp Help
PostPosted: 09 Jan 2017, 09:26 
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Joined: 04 Jun 2008, 20:59
Posts: 4052
Location: Arizona, USA
Hi, I believe that as much as I like DIY tubes, you would be better off building 4 "gain clone" amps. Each to drive one speaker. With adjustable input level controls you could balance the amps out and then drive all of them with a conventional line stage preamp. The alternative in tube amps would be a challange to get all the speakers to play at equal levels. It can be done with "L" pads but I feel they degrade the quality of the sound. OK for background music, not so good for serious listening.

Good listening
Bruce

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 Post subject: Re: DIY Stereo Amp Help
PostPosted: 14 Jan 2017, 00:51 
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Joined: 07 Jan 2017, 16:53
Posts: 3
Thanks for the input everyone!

Bruce (or anyone else) - going with the 4 gain clone amps driven by a conventional line stage preamp idea, are there any kits you would recommend that perform well and are relatively inexpensive?

I would like to try and do this to get some more experience, and being a college student, I don't have a lot of money to spend haha.

Thanks again!


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 Post subject: Re: DIY Stereo Amp Help
PostPosted: 14 Jan 2017, 08:53 
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Joined: 04 Jun 2008, 20:59
Posts: 4052
Location: Arizona, USA
Hi, Your thread but heading OT. There are many. When I bought mine I got them from Pete Millet (on the web). Easy to build and pretty cheap. You can now however get four channel class D amps from places like Parts Express for even lower cost and from all I hear they are really quite good. They also sell power supplies that can go with them. A semi modular approach. The DIY part would be to make a nice chassis or case, adding input and output jacks, switches and controls and generally making it work. On a budget I would seriously consider them.

Good listening
Bruce

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