Having previously tried the Fane Sovereign 12-250TC 8 TRIPLE Cone, I thought I'd try a Visaton BG17 8ohm. OK, so this is only TWIN cone, and similar types have been around for years, but I have an old plastic enclosure from a stereo system, which is standard 6.5 inch speaker size, but with no tweeter. The idea of having such a wide frequency range without the requirement of crossovers. (No losses!) Everything depends on the actual performance. My hearing is good to 17.5kHz and the sound is the better than ever, nice smooth flat response, but with a rise to 5kHz (rather than the usual 3.5kHz) there's nothing seriously missing for low level monitoring, apart from bass response due to the small size. Thoroughly recommended !