>>>these two products, as far as I know, are the only ones using these filters
Add Ayre to this list, they've been doing this filter type about as long a Meridian:
http://www.ayre.com/pdf/Ayre_MP_White_Paper.pdf
The "MP" filter can be found on their DAC, CDP, universal, and BDP units.
Add Ayre to this list, they've been doing this filter type about as long a Meridian:
http://www.ayre.com/pdf/Ayre_MP_White_Paper.pdf
The "MP" filter can be found on their DAC, CDP, universal, and BDP units.