I have a PAM8403 based amplifier module and going to build a small portable speaker, mostly to listen to lectures and audio books. The module looks like this:
First I attached two 4 ohms 3 watts speakers and it worked fine. But I've read that it would make a clearer sound with 8 ohms speakers. And in the module properties it is said it can work with 4-8 ohms speakers.
A clear sound would be a benefit for me, but will I loose power (loudness) with higher resistance speakers?
How is the sound quality related to the speaker resistance? What is the theory behind it?
All the speakers I am going to use would be the same diameters.
Here is the efficiency chart from the PAM8403 datasheet:
As far as I know, efficiency is about delivered power, not quality of the sound. Please correct me if I am wrong.