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<blockquote data-quote="THATpurpleKUSH" data-source="post: 7592925" data-attributes="member: 615398"><p>This method takes into account the amp&#039;s efficiency. Its not the acutal volts the amp is getting, just a place holder for efficiency. No amp is 100% efficient so they will never output the full power that they consume so the rest comes out in heat. AB class amps are usually around 50-60% and D class amps are 75-85% efficient. For AB amps I like to multiply onboard fusing x 7 (assuming 50% efficiency or 7/14.4) and fusing x&nbsp; 10 (low estimate assuming ~70% efficiency or 10/14.4) for D class amps. This usually gives a pretty accurate figure for 14.4v output at lowest rated impedance- though it is still a rough estimation. My Alpine 4ch has 50a of fuses, is an AB class, and is rated for 75w x 4 and my Rockford Fosgate D class mono has a 140a internal fuse and is rated for 1000 but has a birthsheet of 1399rms. My old Crunch p1500.1 (AB class) had 120a of fuses and was rated for 750wrms, not cea2006 compliant but did close to rated power (I estimate around 700wrms).</p></blockquote><p></p>

[QUOTE="THATpurpleKUSH, post: 7592925, member: 615398"] This method takes into account the amp's efficiency. Its not the acutal volts the amp is getting, just a place holder for efficiency. No amp is 100% efficient so they will never output the full power that they consume so the rest comes out in heat. AB class amps are usually around 50-60% and D class amps are 75-85% efficient. For AB amps I like to multiply onboard fusing x 7 (assuming 50% efficiency or 7/14.4) and fusing x 10 (low estimate assuming ~70% efficiency or 10/14.4) for D class amps. This usually gives a pretty accurate figure for 14.4v output at lowest rated impedance- though it is still a rough estimation. My Alpine 4ch has 50a of fuses, is an AB class, and is rated for 75w x 4 and my Rockford Fosgate D class mono has a 140a internal fuse and is rated for 1000 but has a birthsheet of 1399rms. My old Crunch p1500.1 (AB class) had 120a of fuses and was rated for 750wrms, not cea2006 compliant but did close to rated power (I estimate around 700wrms). [/QUOTE]

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