Very rare, hard to find! These are a set of two original Bybee Technologies Quantum Force high end balanced audio interconnect Filters. They will open up your sound with better detail and will bring you more spacious and natural sound. Use them between your XLR interconnects, also suitable for digital ones. They are in a very good condition and they have the original XLR connectors. Retail price is 1.999 euro. Check our other listings for more interesting items. Free shipping worldwide!