Keep AB or Upgrade To D class?

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DYohn

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Joined: April 22, 2003

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Posted: November 06, 2006 at 3:43 PM / IP Logged

You are on track. Class D will use less current to create the same power than will Class A/B.

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stevdart

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Posted: November 06, 2006 at 4:37 PM / IP Logged

wrote:

Finding the waste factor is a bit tricky for me as I am math-deficient. We want to know what the draw on the system in watts has to be, in total, that will result in 600 watts after applying the waste factor... I'll have to use some trial-and-error to find the result...

A/B: 1000 * 60% efficiency = 600 watts.
D: 750 * 80% efficiency = 600 watts.
(Anyone who knows how to apply this math without resorting to trial-and-error, please post it.)

vinspo wrote:

Stevdart - Here is your formula for efficiency(E is efficiency in decimal form)

(RMS * 2) / (E * 2) = Total RMS

You can then apply ohms law to calculate amp draw.

Thanks, vinspo. Just what I was looking for. So for the 600-watt class D amp with the rough estimate of 80% efficiency that I used in my post, the math would look like this:

(600 X 2) / (0.8 X 2)
1200 / 1.6 = 750 watts demanded.
I'll save that formula in my calculator files.
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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Keep AB or Upgrade To D class?

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