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In Reply to: fuse for 1.6 is 4 amps.... why do I need a high current amp ? posted by Listener26 on April 16, 2007 at 11:44:12:
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Good answer Rod thanks.Next stupid question: If a common home circut only will feed 15 or 20 amps... how can the amplifier put out 45 amps ?
When you look inside a solid state amp, the input is 120 vac, up to 15 amps. However, the power transformer used to feed the power supply is stepping that 120 vac down. One thing about transformers, is that as the secondary voltage goes down, the possible amperage draw goes up. As a generality, if your transformer put out 1/2 of 120vac, (60vac), your possible current draw would approx double to 28 amps.Just remember, this scenario is approx, the results may vary!
Your analysis is for a steady-state situation. Due to stored energy in room air and speaker driver masses, the amp may be required to deal with very large, but very brief, transients. The resistance of the active output devices becomes the limiting factor in the transient current capability.
Henry
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