Measuring amp output for watts RMS
#12
Originally Posted by Zoomer
disconnect the speakers? Then you have no load for the amp to power and all you are doing is measuring open circuit voltage.
The rated load (4 ohms) is fine for calculations. A scope is the ideal but anyone who asks how to determine power output isn't likely to have access to one.
#13
Unless you can measure current you'll never know what your amp is outputting. At least the scope will tell you if you're clipping.
Speaker impedance varies too much with frequency, which you can ignore if you know the current, and voltage. Without that, you're just wasting your time. You're not going to get any useful numbers, just numbers that you think are useful.
#14
This should have been the first comment in this thread.
Unless you can measure current you'll never know what your amp is outputting. At least the scope will tell you if you're clipping.
Speaker impedance varies too much with frequency, which you can ignore if you know the current, and voltage. Without that, you're just wasting your time. You're not going to get any useful numbers, just numbers that you think are useful.
Unless you can measure current you'll never know what your amp is outputting. At least the scope will tell you if you're clipping.
Speaker impedance varies too much with frequency, which you can ignore if you know the current, and voltage. Without that, you're just wasting your time. You're not going to get any useful numbers, just numbers that you think are useful.
If you only want to know if you are getting close to the advertised output of your amp then a scope is not required.
Thread
Thread Starter
Forum
Replies
Last Post
hott-nix
Car Audio Technical Discussions
8
06-05-2007 07:19 PM