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Date: May 01, 2003 at 17:40:55
From: Murilo, [160231169.rjo.virtua.com.br]
Subject: Re: 90 amp fuses can give more than 1200 Watts ?

URL: Porjects for my four 12 inch free-air subwoofers


> 3x30 A fuses @14.4 V would give you something in the
> neighborhood of 650 wrms @ 4 ohms - the fuses are used for
> both the push and pull (p and n) output stages of the amp, so
> divide the power you got by 2 to get the rms power of the
> amp at 13.8 volts.

Are you talking about 14,4 or 13,8 volts ?
When you said "push and pull", did you mean the positive and negative peaks of the waves? If you did, I did not understand the point, because the positive and negative voltages at the speaker leads do not occur at the same time.
Did you consider heat beeing produced ?
Did you take in account it's a Class D amp and that Class D amps have high efficiency (85% - 90 %) ?

> But if it isn't a slow blow, it will just blow
> very quickly if the current limit is exceeded.

How much quick do you think a ATC/ATO fuse blows with the double amperage than it's rated to handle ?

Read my other reply also :)


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