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Some experimentiing with a cheap PAM8403 Class D Audio Amplifier Module results in a very compact and efficient stereo amp with very reasonable sound quality.

A 3W RMS stereo amplifier can indeed be quite small, especially if it is designed for compact or portable applications. With advancements in technology, it is possible to create powerful audio amplifiers in small form factors. These amplifiers are often used in small speakers, headphones, portable audio devices, and other compact audio systems where space is limited. Despite their small size, these amplifiers can still deliver decent sound quality and volume levels for personal or limited area listening.

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