These are most often run with their USD waveguide horn tweeters for very high-end applications. Sturdy yet refined, strong SQ woofer. Brand new never powered. $100 shipped for the pair.
Sorry, mfr is Speakerworks (USD audio), so my image dynamics reference may be inaccurate (though I think the horns are the same... irrelevant in this case). Modest power rating but rather high efficiency:
Model : USD-622~6.5 inch Mid-Woofer~4 ohms~80 Watts Max. Power~Sensitivity Rating 90db~Frequency Range 60-2000 Hz