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<blockquote data-quote="Papermaker85" data-source="post: 6884968" data-attributes="member: 572595">you simply cannot go on fusing for output.. your better off opening the amp up and looking at the transistors to approximate power.i can put 3 40 amp fuses in a 1kw amp and claim 1200 RMS @ 12.8 volts doesn&#039;t mean its going to do it if the transistors won&#039;t supply the current needed..as for class Ds there ruffly 65-75% efficient at its lowest load at full power..fuses are not all made the same and there not made to blow instantly when you exceed its rating.. as mentioned eariler some power supplies will draw more current on demand while others use larger cap banks and pull current in a much more constant form..take for example the RF 15000 kw.. it constantly pulls 300 or so amps too keep the bank charged even if your only getting 200-300 watts of output on the other hand MMats amps do the opposite and only draw the amount of current necessary for the output/load..its no secret thats amperage x voltage will give you power in wattage but you simply cannot say amp A has 2 25s and b has 2 30s and B is stronger..also if you multimeter isn&#039;t designed for inrush current it simply won&#039;t provide your with a RMS number.. again this goes back to the power supply..its easier when you have a constant load when measuring output..</blockquote>

[QUOTE="Papermaker85, post: 6884968, member: 572595"] you simply cannot go on fusing for output.. your better off opening the amp up and looking at the transistors to approximate power. i can put 3 40 amp fuses in a 1kw amp and claim 1200 RMS @ 12.8 volts doesn't mean its going to do it if the transistors won't supply the current needed.. as for class Ds there ruffly 65-75% efficient at its lowest load at full power.. fuses are not all made the same and there not made to blow instantly when you exceed its rating.. as mentioned eariler some power supplies will draw more current on demand while others use larger cap banks and pull current in a much more constant form.. take for example the RF 15000 kw.. it constantly pulls 300 or so amps too keep the bank charged even if your only getting 200-300 watts of output on the other hand MMats amps do the opposite and only draw the amount of current necessary for the output/load.. its no secret thats amperage x voltage will give you power in wattage but you simply cannot say amp A has 2 25s and b has 2 30s and B is stronger.. also if you multimeter isn't designed for inrush current it simply won't provide your with a RMS number.. again this goes back to the power supply.. its easier when you have a constant load when measuring output.. [/QUOTE]

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