One of the very few rack-compatible bass preamps (1RU).
Chock full of variables, it will take you a while to find your sweet spot and explore all the options of this one.
It has two sections, with different features, one dedicated to emulating tube amp characteristics.
These two can be used independently, or simultaniously, mixing or defeating individual output levels BEFORE master output level. Very versatile.
Also, apart from the standard front input, it has two switchable instrument inputs on the back panel, enabling you to keep two basses plugged in and switching from one to the other with the A/B input selector in front. Nice feature.
It's beautiful to look at (IMO) and of sturdy build quality.
I got it because my one rack unit (1RU) BBE BMax died on me a while ago. BUT, lo and behold, after i got this one, i managed to get the BMax running again (replacing a few potmeters and some light soldering).
So now i have a three-section bass preamp, individually mixable and levelable at will, the net result feeding into an 'active' cabinet (i.e. with proprietary built-in power amp).
I'm in heaven!