I built an outboard amplifier/speaker especially for the KX3. It
consists of a pair of 2 watt 4 ohm 50mm speakers in a small plastic
utility box. The amplifier is a tiny (1.25" x 1.25") stereo class D
board (with volume on/off control) I bought off ebay for about US$4.
Including connectors, the whole project was less than US$10. The result
is a very satisfactory, compact speaker/amplifier with room-filling
audio output. I've included an internal, rechargeable LiPo battery for
portable ops. (Although, I'm more likely to use earbuds out-of-doors).
The only negative, if you consider it one, is the low-end response cuts
off somewhere around 300 hz - so not much bass. But, for normal voice
communications, it works splendidly. The total size is roughly 2.5" x
4.5" x 1.25". The box is quit rigid and does not buzz or vibrate. The
power supply is a decent, regulated 5V 2 amp wall wart. There are not
any notable artefacts that could find tuning around the band.
73, Doug -- K0DXV
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