I'm thinking of replacing my Rel Storm amp panel with one that's got a
better crossover filter, and routes frequencies above the knob setting to
the phono outputs. So I'm looking at a BK digital switching sub amp panel,
or perhaps SVS PCi panel.

# Now I've currently got DAC to 8000S, then onto 8000SX, then speakers.
Subwoofer connected to speaker level. Speakers are receiving full-range
audio.

See pic with another method. DAC plugs into amp sub panel, which then routes
sub knob setting to sub, above that to RCA outputs. Then onto
integrated/amp/speakers. So the 8000S (in pre-power mode) and 8000SX will
recieve everything above 60hz, sub 60hz

http://nathansilly.012webpages.com/pic.JPG

Is this a good idea? Or are the internals of amp sub panels pretty crappy
that I should just leave it connected as "#" and then just replace amp sub
panel, send speaker level to sub, adjust as desired? (standmounts still
receive full-range)

ta for any help