Actually, David, I had forgotten about the original post I made here & the mention of an upgrade to DML technology, namely BMR (Balanced Mode Resonance)
It would seem that BMR is different to DML in that it is "a methodology for controlling modal bending wave activity enabling pistonic action and surface excitation to be combined in a single transducer or driver."
Tectonics seems to be the most active http://www.tectonicelements.com/bmr-speakers/ & cheap drivers available from Parts Express
A good DIY site found here
A good sounding video here [video]https://youtu.be/hPNla0uQWGk[/video]
It would seem that BMR is different to DML in that it is "a methodology for controlling modal bending wave activity enabling pistonic action and surface excitation to be combined in a single transducer or driver."
Tectonics seems to be the most active http://www.tectonicelements.com/bmr-speakers/ & cheap drivers available from Parts Express
A good DIY site found here
A good sounding video here [video]https://youtu.be/hPNla0uQWGk[/video]