Question about Car Audio & Video
I would suggest that you take this to your local auto-sound shop to have this done, however here is a procedure that has worked for me in the past. (It is tedious, but it allows you to develop an excellent chart showing relationship between frequency and power and helps you know the frequency limitations of your amp.
If you are trying to get the full range of power then I would suggest doing what is called a load test. For this you will need to use high wattage power loads (high wattage resistive loads 8 ohms) connect these in place of your speakers and sub-woofer put the amp at full power and inject a 1000 Hz tone and then with an oscilloscope adjust the sine wave to 0 distortion and measure the output voltage (Peak to Peak) and then do this calculation to get the RMS voltage:
(P to P/ 2) x .707 = RMS
Use the RMS voltage divided by the resistance (8 ohms) to get your amperage (current value).
Then once you have your current use it multiplied by the RMS voltage to get your max Power without distortion.
This will give you a good indication of the max power you can get without distorting the signal. I use 1K Hz because it is a reference tone. basically you can do this test on the whole audio frequency spectrum for a more in-depth measurement (building a power response graph).
I hope this helps,
Posted on Aug 11, 2008
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Posted on Jan 02, 2017
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