Dbphd, we have yet to find any passive filters that won't compromise the sound of a great high resolution system.
The Kef Ref 1 can play loud and do not really benefit from removing the strain of the bass from the speakers unless your room is huge or you listen very loud if you have enough power the Kef Ref 1 will play very loud.
We run ours without any crossover in line with the speakers and dial in the subwoofer to add pressure to the Ref 1's output.
You won't loss one iota of clarity and you still get great bass, without losing any detail.
Dave and Troy
Audio Doctor NJ Kef Ref dealers
The Kef Ref 1 can play loud and do not really benefit from removing the strain of the bass from the speakers unless your room is huge or you listen very loud if you have enough power the Kef Ref 1 will play very loud.
We run ours without any crossover in line with the speakers and dial in the subwoofer to add pressure to the Ref 1's output.
You won't loss one iota of clarity and you still get great bass, without losing any detail.
Dave and Troy
Audio Doctor NJ Kef Ref dealers