I'm looking at the PAM8406 Class-D/Class-AB amplifier and I'm not seeing the efficiency for a 2Ω load in Class-AB mode. The use case for the amplifier is driving mid-range/mid-bass speakers for use with a telephony system (essentially, no music will be output from the amp, and it will only be on for short a duration of time).
From what I've read, Class-D amplifiers are better suited to drive sub-woofers and other bass intensive applications, where as Class-AB is less efficient but more suitable for general audio applications.
- How can I calculate the efficiency of this amplifier?
- Is there a more suitable alternative to this amplifier for my use case? I need at least 2W into a 2-Ω load.