CE2000 Power

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#1 Bob007

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Posted 09 December 2005 - 10:34 AM


This question is about how Crown rates power output.  With my CE2000
connected to  2  Dale 50 watt 2 ohm resistors in serious, at full power, single channel,
I measured 72 volts at the output terminals.  If I am doing the math correctly that
is 1296 watts.  Other amps I have tested this way always fell within, or less than
rated output.  I know these resistors are rated at 50 watts so I never test for longer
than it takes to get a reading.  Is it possible that the CE2000 can output
1296 watts single channel for short periods like this?  Or is my load
causing an erroneous reading.  At what current does the amp start
to limit?  72v into 4 ohms would be 18 amps.  
Thanks in advance.... Bob

#2 DGlass



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Posted 09 December 2005 - 02:00 PM

You don't say but I am going to assume you were using a 1K Hz signal for the test.

It sounds to me like you were reading Peak Voltage not the RMS voltage.

Take the peak voltage and multiply it by .707
72 x .707 = 50.904 volts rms (~51 volts)

Using Ohms Law: Power is equal to the voltage squared divided by the impedance.
(51v x 51v)/4ohms = 650.25 watts

That's pretty close to the published 4-ohm "Max. Average Power" at 1k Hz rating of 660 watts. smile.gif

It looks like what you were reading was the Peak Power available at the frequency of testing not the RMS power.