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Originally Posted by jkdas What he meant was: a HU wont supply more than 5-6Watt per channel with car's power supply. Max rms are calculated by manufactures when the HU is fed a power of 14V or so. 20-20khz: frequency with human hearing capacity. |
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Originally Posted by jkdas more like 6-8W rms/ch x 4 ch, 20-20kHz, <0.1% distortion. |
JKD.. actually you are a little off target... What Navinji meant was...
HU power ratings are usually quoted as per measurements at 1KHz. This is when the unit is playing a test tone of 1KHz. Since this frequency is easy for the amp to reproduce, it can play this freq louder... and peak at say 18watts. However, when the same unit is measured with full range music / material, the load is greater and the output would just be 6-8w with <0.1% distortion. If you were to measure the output at <0.01% distortion it will be even lower... and so on...
On a lighter side, its like saying Sam can throw a person (say we used McLaren) 15ft. Since McLaren (some 30Kgs only) hardly represents average weight, that information is useless. Similarly, If we said Sam could throw a person (say... me, 120Kgs ) 2ft, that data is again not a true representation of Sams capabilities... So now if average weight is 80Kgs and Sam could throw Jb 6ft... that is a true measurement. hehehe.
Since you dont listen to test tones, you should look at the '20-20KHz' power and distortion figures cuz thats what represents your music, and will give you an accurate picture of the amps (HU internal or external) power ratings.