No idea why there is a disagreement. This is from the Data Sheet I linked above:
View attachment 4824957
A couple of points:
1. These are calculated figures and real world measurements will be lower due to power compression.
2. The Peak rating is 6dB over the continuous rating. This commonly how peak ratings are reported, but AFAIK the real difference is only 3dB.
Why? (sorry this will be long and confusing) These ratings are based on RMS, Program, and Peak power levels. RMS and Program are both RMS wattage values, measure with RMS volts. Peak Power is simply 2X whatever the RMS value is. In the case of speaker ratings, it's usually 2X the Program power, but some manufacture use 2X the RMS power rating.
AFAIK these three values come from the way speakers are typically tested. A signal with 6dB crest factor is used. Crest factor is the ratio between the peak value and the effective value.
The point most people miss is 200W Program power is exactly the same amount of power as 400W Peak. It's a different way of measuring. Program power is measured in RMS volts and Program power is measure in Peak volts.
View attachment 4824980
A steady sine wave has a 3dB crest factor. Remember when power is double you get +3dB. Likewise when power is cut in half, you get -3dB. this image shows a 3dB different between the RMS and Peak voltage.
Ohms Law Formula Wheel
Here's the RMS Watts to Peak Watts conversion calculation to show my point.
200W at 8 ohms requires 40V RMS.
The formula I used is V=sq rt(PxZ)
Now let's convert the RMS volts to its equivalent Peak value by multiplying by (sq rt 2)
40 x (sq rt 2) = 56.56854249Vp
Now let's calculate the equivalent peak wattage using the peak voltage and 8 ohms, using P = (V^2)/Z
(56.56854249^2)/8 = 400Wp
So 200W RMS = 400Wp. (this represents a 3dB crest factor)
However, since they are actually the same power level how do you get any change in SPL?
Maybe there is a different in the way the SPL is measured as well, but AFAIK, your ears will not know the difference between 200WRMS and 400Wp.
AFAIK 117dB continuous and 120dB burst would probably a better explanation. Burst would be calculated on the RMS Program Power rating.