Nuforce provides three interchangeable filters (MSRP $49.95/unit):

MC-SCTL - for low output impedance tube amps
MC-SCTH - for high output impedance tube amps
MC-SCSS - for low output impedance solid-state amps"

A pair high quality OFC speaker cable is included with each Magic Cube. For better performance, customer could order the Nuforce Focused Field speaker cable.

Filters are NOT REQUIRED for use with Magic Cube. Our preference is to use Magic Cube with Nuforce amp without any filter.