Yes, after a couple of years of her sitting on the shelf, I'm in the process of resurrecting my overly abused sm-400. No, I can't explain fully why I decided to put her up in the first place. Of course, it's fairly well known these things have an issue with trying to reproduce continent shifting, bowel loosening low frequencies that are doing nothing more than wasting precious power and trying to pin my cones to the back wall. But the tone... Oh the tone... So, in an effort to save my power amp, speakers and foundations of my home and any venues I play, I've been looking into high pass filters. I've seen the [sfx] Thumpinator and at some point in the future there WILL be one on my board but at the moment budget is a primary factor. So that brings me to the only other real alternative I've seen... the fDeck HPF-pre, specifically V1. The one question I have about them is; Seeing as they were developed for upright basses and piezo pickups, is there anyone out there who has experience using one with an active bass? Has it worked out? Or was the 2:1 volume bump just too much for an effects chain or amp input to handle? I would presumably be using one after my bass and in front of my effects, mostly due the positive effect it can have on compressors... or at least so I've read. And yes, I do know there is a 2nd version with a volume control but, I've seen a couple of REALLY good deals on the V1 and was hoping it would be a viable alternative.