Wonder if it is possible to restrict frequency out of the Dared sl-2000a pre-amp into a biamp setup to drive tweeter and woofer separately into speaker that has input for both tweeter and woofer. I was thinking interm of spectrun and if it works the same way.

i meant bandwidth instead of spectrun .

Using Trends PA-10 Tube Pre-amp and you have fun tube rolling as well enjoy the high end tube sound.