I've bought this tweeter for a custom bass cab I was building... it ended up sounding decent but the quality is so low that the thing created a strange rattle when I played thru the cab. Had to modify the routing for a different tweeter. :-(
This is the double piezo tweeter that is also used by Peavey UK in their Eurosys series speaker enclosures. I use it as a slap reproduction speaker for upright (rockabilly/swing) bass. While it's a piezo element with relatively high impedance, you should, in theory, be able to just hook it up in parallel with a (bass) speaker / woofer. I use a simple capacitor/resistor high pass filter thoug. A great feature of this tweeter is it's shape: while is is a retangle (rather than round), it's much easier to install in bass enclosures.
For rockabilly slap bass, these tweeters are GREAT. I would not recommend them for full range speaker enclosures where you want more than very high frequencies, better invest a little more in e.g. Peavey 14XT or 22XT drivers.
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