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<blockquote data-quote="thch" data-source="post: 2211208" data-attributes="member: 562032">i&#039;ve made long posts about similar topics in the past.&nbsp; in short, there are typically too many unknowns to &quot;benchmark&quot; an amp outside of a test facility.efficiency curves for an amp will be primarily based upon class.&nbsp; at low power, amps are less efficient (it takes some power to keep the amp on)&nbsp; at high power, amps are typically more efficient.switching amplifiers (class D and variants) offer high efficiency from low to high power outputs.&nbsp; sometimes arbitrarily close to ideal.linear amplifiers (class A, B, ect...) will give higher efficiency at high power then low power, but still will be low compared to class D.&nbsp; a 30% efficiency @ 1/3rd power is not unheard of, with a 60% efficiency @ full power.&nbsp; (as you bias more towards class B, distortion increases but so does efficiency)i&#039;ve never heard of this 36V vs 12V rating scheme for fuses.&nbsp; its a thin peice of wire, there should be 0V across it.&nbsp; IIRC the relevent metric is the I2t time which gives an indication of how long a minor or major overcurrent condition can exist before the fuse opens.class A will be especially low at any power output.</blockquote>

[QUOTE="thch, post: 2211208, member: 562032"] i've made long posts about similar topics in the past. in short, there are typically too many unknowns to "benchmark" an amp outside of a test facility. efficiency curves for an amp will be primarily based upon class. at low power, amps are less efficient (it takes some power to keep the amp on) at high power, amps are typically more efficient. switching amplifiers (class D and variants) offer high efficiency from low to high power outputs. sometimes arbitrarily close to ideal. linear amplifiers (class A, B, ect...) will give higher efficiency at high power then low power, but still will be low compared to class D. a 30% efficiency @ 1/3rd power is not unheard of, with a 60% efficiency @ full power. (as you bias more towards class B, distortion increases but so does efficiency) i've never heard of this 36V vs 12V rating scheme for fuses. its a thin peice of wire, there should be 0V across it. IIRC the relevent metric is the I2t time which gives an indication of how long a minor or major overcurrent condition can exist before the fuse opens. class A will be especially low at any power output. [/QUOTE]

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