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6th December 2009, 02:53 AM  #1 
diyAudio Member
Join Date: Dec 2009

Voltage Vs Wattage question ?
Hello all i am new to this forum and would like to ask a question i am a newbie to this forum have had a small amount of experience with electronics but am confused as to why some sites state that for a certain wattage output of an amp you need a minimum voltage
is it possible to use higher rated components to deliver more current at the same voltage or does this create interference thanks in advance to all replies 
6th December 2009, 03:38 AM  #2 
diyAudio Member
Join Date: Jun 2008
Location: SoCal

It all depends on the load(speaker), for a given output(wattage) a 16 Ohm load will need a higher voltage,less current than a 4 Ohm load less voltage, more current. This is for solid state only, hollow state(tube) is another matter. Ohms law and various other formulae bare this out.
Craig 
6th December 2009, 03:42 AM  #3 
diyAudio Member
Join Date: Dec 2009

Say my load is a 4ohm speaker and i want to supply it with 300 watts, how could i get around using a low supply voltage with an amp
and what is a good smps that will deliver enough current and voltage for 2 tas5630's 
6th December 2009, 04:17 AM  #4 
diyAudio Member
Join Date: Mar 2008
Location: Portland OR

Little bit of math here, Ohms Law.
Voltage = Current * Resistance, V=IR Power = Voltage * Current, P = VI if we sub in V=IR into the power equation, P=VI we can get 2 alternative forms for power. P = I*I*R P = (V*V)/R This is where a given wattage requires a certain amount of voltage into the load, R. 
6th December 2009, 04:58 AM  #5  
diyAudio Member
Join Date: Dec 2009

Quote:
I am guessing car amps that produce high wattages run an internal inverter or smps. a bit off topic but what is a good mosfet amp with crisp audio that can produce alot of power 

6th December 2009, 10:54 AM  #6 
diyAudio Member
Join Date: Nov 2009
Location: Cape Town


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