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Old 20th April 2006, 05:55 PM   #1
sdnnet3 is offline sdnnet3  United States
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Default can anyone help with this?

i'm trying to build an amp to power 3 horns (40w, 8ohm, realistic super power horn from radioshack i believe) but not to sure about what exactly to do. i think that 100 - 120 watts from a power amp would be enough to power them, but i'm not sure. does anyone know of a good amp design i could use to power these.

here are two designs that looked simple enough, and (at least to me) look like they could power these 3 horns without a problem.
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Old 21st April 2006, 02:20 AM   #2
jaycee is offline jaycee  United Kingdom
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If they are rated 40W at 8 ohms then presumably you will put them in series. If you paralleled them you would end up driving a 2 ohm load which is not an easy task.

Personally I wouldn't bother with anything more than chip amps. Using 2x LM3886's in a bridge configuration is probably best here.
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Old 21st April 2006, 04:45 PM   #3
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Personally, I'd use 3 separate 40watt amps.
It's much easier that way.
I don't like parallel or serial speakers.
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Old 21st April 2006, 04:54 PM   #4
AndrewT is offline AndrewT  Scotland
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I support Myhr's suggestion.
Three separate amps from a common low voltage supply built into one box. i.e. a 3channel power amp.

For 3*40W a set of chip amps would be simple and cheap.

If one goes faulty you still have two good ones.
regards Andrew T.
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Old 23rd April 2006, 07:14 PM   #5
sdnnet3 is offline sdnnet3  United States
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many thanx everyone
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Old 23rd April 2006, 07:21 PM   #6
Eva is offline Eva  Spain
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TDA7294 is a good alternative. It will drive 2 ohm loads as long as supply rails are below +-20V. Furthermore, it can drive 4ohm loads with +-40V rails as long as gentle cooling is provided (its safe operating area is only limited by heat as it has a N-channel MOSFET output stage).
I use to feel like the small child in The Emperor's New Clothes tale
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