I was a bit sceptical att first. Out of the box they were very stiff, I couldn't even measure a self-resonance. I had to soften the litz-wire between terminal and voice-coil by bending it repeatedly with a pair of pliers. After 3 hours burn in at 5W/50Hz the Fs was 94/99 Hz respectively, far from spec, so I ran an additional 5 hours at 5W/50Hz plus repeated heating with a hairdryer. After that the Fs was the specified at 75-80 Hz. I use them in ...
I was a bit sceptical att first. Out of the box they were very stiff, I couldn't even measure a self-resonance. I had to soften the litz-wire between terminal and voice-coil by bending it repeatedly with a pair of pliers. After 3 hours burn in at 5W/50Hz the Fs was 94/99 Hz respectively, far from spec, so I ran an additional 5 hours at 5W/50Hz plus repeated heating with a hairdryer. After that the Fs was the specified at 75-80 Hz. I use them in a heavily damped 0.85 l enclosure with a 20x200 mm port. They work well down to about 50 Hz in that configuration. It is a really solid driver, no rattle, huffing or hissing despite generous cone excursion, but it needs a serious burn-in to function properly.
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