Selling my F-1x preamp and SF2 superfilter. Both are in solid working condition with no issues.
F-1x is $550 including PayPal and shipping in US.
SF2 is $725 including PayPal and shipping in US. SF2 includes the adaptor.

Buy both and get an SKB rack mount case free (a $150 value).

Rack these two up with a good power-amp, and you got yourself the baddest bass rig in town. 

I have done that myself actually and i can attest to it being a hugely versatile but easy to use tone monster. Also it must be noted that the SF-2 is in itself a superb stand alone pre-amp and one i have used in this way for around a year or so.

No longer for sale. I have sold enough other stuff to cover a recent acquisition.

I'm surprised no one grabbed them but glad you were able to keep them!

Good move Mark.