Vladimir said:
Behringer A500 is specified as 125Wpc at 8ohms with 1kHz signal at 1% THD (CLIPPING), 185Wpc in 4ohms. That means it is less powerful at 20Hz-20kHz and 0.5% THD.
YBA 2A has bigger power supply, higher quality parts, doubles its 8 ohms rating into 4 ohms (70/140)
(click to zoom)
I seriously doubt the Behringer A500 would noticably outmuscle the YBA 2A (if at all).
Interestingly that’s not what the loudspeaker manufacturer thinks. They’re looking for 150 Wpc in to 8 Ohms, which the YBA does not get even close to producing. They say:
With any passive loudspeaker there is a trade off between low frequency extension and sensitivity. These monitor’s extended low frequency response means the sensitivity is relatively low. It is therefore advisable to select a power amplifier of relatively high power output capabilities.Typically, best performance comes with use of amplifiers capable of >150W continuous into 8 ohms.
Use of an underpowered amplifier will result in the premature distortion of the system and increased risk of damage due to voice coil overheating
Let’s look at that last bit again shall we -
Use of an underpowered amplifier will result in the premature distortion of the system - I think I’m going to go with ATC’s specified power rating requirements rather than the your 12th Grade physics.