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Old 2nd January 2007, 02:30 AM   #1
Magicdj is offline Magicdj  United States
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Default "boom box" AMP 12 Volt

I'm looking to build a portable "boom box" that is capable of producing ~110-115 SPL. Simular to the "podzuma" http://www.partsexpress.com/projects...uma/index.html
But the little T-amp is a little too small (10-15 watt) to achive those SPL's. What I'm looking for is a 12v amp that is ~30-50 watts. I'd like to know if any one sells finished amps, or if they could build one for me?

Thanks,
Mike
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Old 2nd January 2007, 05:02 AM   #2
DcibeL is offline DcibeL  Canada
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Use a car audio amplifier?
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Old 2nd January 2007, 03:33 PM   #3
Magicdj is offline Magicdj  United States
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I have looked at car amps; they all are too large and heavy. There are only a couple that are Class D - full range, mostly all are subwoofer amps. I was looking for an amp I could fit into a small compartment. Any advice would be greatly appreciated.
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Old 2nd January 2007, 09:25 PM   #4
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You can't do better than the little T-Amp on 12V unless you include a DC-DC converter somewhere to increase the rails on the amp. No home audio oriented amp will do this, as it would simply start with a higher voldage supply. So, any way you slice it you are probably looking at something from the car audio world.

What I'm planning for a similar effort is using an Alpine head unit that supports active tri-amping directly from the unit - (9815 maybe?) It's probably 20W clean per driver or so, but it's good enough for my needs which are far far lower than 110dB. I haven't really started this, although I do have the Alpine.

The other question I'd have is what the speaker system will be, as I can't imagine anything that can even remotely be described as 'portable' producing a clean 110dB+ level.
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Old 2nd January 2007, 10:16 PM   #5
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Quote:
Originally posted by Magicdj
I have looked at car amps; they all are too large and heavy. ...
The xtant 1.1i is pretty small.

The Pioneer PRS models, class-fd , "Ice" while not as small are fairly small and light.
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Old 2nd January 2007, 11:15 PM   #6
Pano is offline Pano  United States
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dkw123 is right on all counts.
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Old 2nd January 2007, 11:51 PM   #7
Magicdj is offline Magicdj  United States
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That Podzuma in the "stock" form should be ~ 107 SPL. Bump it up to 30 watts per channel, now your in the area of 112 SPL.

I like that Xant 1.1, nice size plenty of power but a little pricey at $350...

I did see some other Tripath amp modules that where much higher power than the little T-amp. Does anyone know who makes a complete AMP based off a TK2050 Tripath module? That AMP shows 10-36 volt range.
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Old 3rd January 2007, 12:43 AM   #8
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Quote:
Originally posted by Magicdj
Does anyone know who makes a complete AMP based off a TK2050 Tripath module? That AMP shows 10-36 volt range.

http://www.41hz.com/. See the Amp 4 and Amp 11 kits.
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Old 3rd January 2007, 09:46 AM   #9
Magicdj is offline Magicdj  United States
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That AMP 4 from 41 hz looks good, only problem it is aimed at someone who is skilled at AMP building. Self admittally, that's not me (with electronics at least). Does anyone have experince building this amp? Or who has one willing to part with it Any idea what kind of power you can expect it @ 12 Volts?
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Old 3rd January 2007, 10:09 AM   #10
Pano is offline Pano  United States
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Quote:
Originally posted by Magicdj
Any idea what kind of power you can expect it @ 12 Volts?
Same as the smaller T-AMPs. 12 volts is 12 volts. It's the law, Ohm's Law.

Quote:
now your in the area of 112 SPL.
If you're in the area of 3 feet in front of it. Maybe, if you're lucky....
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