I found one of these (just one) at the local Goodwill. It is a very solid build speaker and unlike any Pioneer that I had seen with a MTM design and two ports on the back. Apparently, they were sold on the Asian market.
https://www.google.com/search?q=pion...w=1416&bih=789

Unfortunately, they only had one and someone poked a small hole in one of the drivers. I thought about picking it up to use as a center but what would I voice match it with? Very cool speaker though.