Determining exact power being sent to your speaker


How does one go about determining the exact amount of power being delivered by the amplifier to the speakers? Let's say the amp delivers 160w/channel at 4ohms (or so the reading materials state anyway) but yet the speaker specs show 120w maximum. My current integrated amp shows the volume
attenuation (dB units) in .5db steps ranging from -100 (min) up to 0.0 (max).

All that said, the concern is when should I be concerned about pushing too much power to the speakers and how I can determine the "Don't turn it up past this number on the display or you will damage the speakers..."
vineman55

@stuartk -- I have nothing against lots of power and have owned and heard lots of amps over the years, ranging from not much power to lots of watts.  So, you're putting words in my mouth with the "mutually exclusive" comment.  It's just in my case, my favorite amp is currently a 20 watt/channel class A Aegir, which replaced a VTV Hypex with many times the power. I prefer the Aegir's sound and never had a hint of running out of steam at my preferred listening levels. 

That's the nice thing about this hobby -- people can pursue what works for them. As they, YMMV for others. 

@mlsstl 

Your prickly defensiveness is entirely unwarranted. 

As I made no accusations, assertions or assumptions, I find it quite puzzling that you would describe my QUESTION as "putting words in [your] mouth".

All I have to say on this topic...

@stuartk -- seems you've also provided a good example of "prickly defensiveness"....  😉