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Old 9th March 2003, 12:32 PM   #1
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Default I have a question about amp resistance

I have a question about amp resistance...

to get more power on 8-16 ohm speakers what need? more O/P transistors ? more Amper ? more volt ?

and to get more power on 1 -2 ohm speakers what need? more O/P transistors ? more Amper ? more volt ?
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Old 9th March 2003, 12:46 PM   #2
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You can increase the output devices and power supply to get more power, however you will eventually run into drive current limitations. There is a good article on this at http://sound.westhost.com/articles.htm I suggest you read it.
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Old 9th March 2003, 06:10 PM   #3
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quote

and to get more power on 1 -2 ohm speakers what need? more O/P transistors ? more Amper ? more volt ?


See here is where you just don't get it.

Lets say you have 8 meters of speaker wire between the
amplifier and the speakers. 8 meters is certainly a fair number
for what you are trying to do. 8 meters of 16 gauge wire
is going to be almost 1 ohm, all by itself. So the speaker wire
will lose 30 to 50% of your available power.

This is one of the many reasons ultra low impedance speaker
systems are a bad idea.

Do you really want to use 8 gauge wire??
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Old 9th March 2003, 06:26 PM   #4
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Default A power game!

Quote:
to get more power on 8-16 ohm speakers what need? more O/P transistors ? more Amper ? more volt ?
In a nutshell...for the some power...let's say 100W

with 8-16 Ohms speakers you need more volts and less amps

then the some power in 1-2 Ohms load where you need less volts and more amps...

Anyway 1 ohms resistor is a realy punishing load ...

Oh mamma mia!!

Jorge
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Old 9th March 2003, 06:27 PM   #5
JBL is offline JBL  Canada
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Théorically the main factor that limit output power is the rail voltage of the amp. The output cannot swing to higher voltage than what the PSU gives. Second to this their is the maximum voltage and current the ouptut device can withstand. All of this must be insid the SOA of the output device and proper heatsinking must be provided.

And finally half a dozen other factor...
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Old 9th March 2003, 06:43 PM   #6
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ok thanks all !
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