When selecting an amplifier and speaker, you are usually provided ratings or output in watts. For a speaker you get maximum and nominal watts rating, while for an amplifier you get output in watts.
I am confused, because I have read that you want your amplifier to have a higher output in watts than you speakers watts rating, as this means it does not need to work so hard to power the speaker, so will avoid clipping.
I have also read, that you only want to supply the speaker on average its nominal rating, while only supplying its maximum rating in bursts. If you exceed these numbers you will damage the speaker.
So, which is it? Should my amplifier have a higher output in watts than my speakers maximum or nominal power rating? Or should my speakers have a high maximum or nominal rating...and if so, which one, nominal or maximum?
Which of these configurations is recommended?
1. Speaker (Max Rating 2W, Nominal Rating 1W) and Amplifier (3W Output) 2. Speaker (Max Rating 2W, Nominal Rating 1W) and Amplifier (2W Output) 3. Speaker (Max Rating 2W, Nominal Rating 1W) and Amplifier (1.5W Output) 4. Speaker (Max Rating 2W, Nominal Rating 1W) and Amplifier (1W Output) 5. Speaker (Max Rating 2W, Nominal Rating 1W) and Amplifier (0.5W Output)
To provide some context, I am designing a solution for a low cost consumer product that does not require high fidelity audio or high volumes. The amplifier will need to run off 3.3v or 5v, which will be provided by an adapter connected to mains power. Audio will be provided by a line-level input, most likely the audio device will be a phone, mp3 player or computer.
I am currently looking at these ICs, as I just need a low cost mono amplifier (class AB) to drive a small speaker (most likely 8 Ohms, unless I can be convinced otherwise) - http://www.ti.com/product/tpa6211a1#parametric