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Amp question 

 

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 Post subject: Amp question
Posted: Thu Jun 16, 2005 6:05 pm 
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I am new to car audio and need some advice.
when power figures for amps are quoted, they usually list a figure a 4 ohms and a figure at 2 ohms.
how do you switch between the 2 resistance levels? How do you determine what level it is putting out.

cheers
chris.

 

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Posted: Thu Jun 16, 2005 7:22 pm 
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Its based on the load (voice coil resistance) applied to the amplifier.

If you connect 4ohm speakers, it will run at 4 ohm.

If you connect 2 ohm speakers, it will run at 2 ohm.

Then from there you have different options at running multiple speakers in parrallel or series to alter the resistance.

Have a look at Pyroay's Amplifier Tutorial, which is in this forum. It explains it all quite well.

 

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Posted: Thu Jun 16, 2005 7:24 pm 
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http://www.fordmods.com/forums/viewtopic.php?t=9845

Theres the link :)

 

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Posted: Thu Jun 16, 2005 11:07 pm 
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Well lets say for example you have 2 x 4ohm 10inch subs.
Each speaker has a single voice coil with a 4ohm resistance.

You can connect both speakers onto one set of terminals of an amplifier with the positives together and the negatives together. That is called parallel wiring and will half the resistance that the amplifier sees a 2ohm load.

A Monoblock amplifier will work best in this application as most class A/B's wont be stable into a 2ohm load on a daily basis.

 

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