can anyone help with this?

sdnnet3 · 20th April 2006, 05:55 PM

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.

jaycee · 21st April 2006, 02:20 AM

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.

myhrrhleine · 21st April 2006, 04:45 PM

Personally, I'd use 3 separate 40watt amps.
It's much easier that way.
I don't like parallel or serial speakers.

AndrewT · 21st April 2006, 04:54 PM

Hi,
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.

sdnnet3 · 23rd April 2006, 07:14 PM

many thanx everyone

Eva · 23rd April 2006, 07:21 PM

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).

21st April 2006, 04:54 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 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.

23rd April 2006, 07:21 PM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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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21st April 2006, 02:20 AM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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.

21st April 2006, 04:45 PM	#3
myhrrhleine diyAudio Member Join Date: Jan 2006 Location: Avalon Island	Personally, I'd use 3 separate 40watt amps. It's much easier that way. I don't like parallel or serial speakers.

23rd April 2006, 07:14 PM	#5
sdnnet3 diyAudio Member Join Date: Apr 2006 Location: san diego	many thanx everyone

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