I measured the impedance myself, this is quite easy with a multimeter. I did not measure sensitivity myself, someone else did. I didn't ask him to but he was curious, since he also noticed the amp getting hot. He plays live music and has an SPL meter in his bag with a relatively nice mic compared to the radioshack crap, but I don't know how he got exactly 1 watt out of the amp.. or maybe he didn't. It happened after he noticed it was hot when he walked past the amp.
I still see a jaw drop to everyone I demo these to.
