Works great with K&K banjo twin on open back 5-string. I've used this box w/ mando twin on multiple installs and it always performs great. For the banjo twin the XLR out was VERY hot, switched to 1/4" out and it calmed the microphonics & allowed for a little more gain. I would like to have power cable for permanent pedal board installs.
This preamp is the ONLY preamp that is an exact match for their passive pickup. I tried to use 'another name brand' preamp and impedance was not a match. It caused the sound to be harsh, but with this gem it is perfect. Don't hesitate, if you have a K and K passive pick up in your guitar - BUT IT.
I started using K&K PU's a long time ago (see my PU, review) and the K&K XLR Preamp was the logical choice to compliment and complete the system. Since it's designed by the makers of the KK PU's, it's a perfect match. Sonically, it's clean, clear, has lots of headroom/gain and plenty of EQ options for you to easily dial in your "perfect" sound. We have a number of these units that get used for acoustic guitar, piano, and violin with excellent results. I gave fours stars instead of five because I'd like to see a mute button on it,the construction could be a bit "beefier", and I'm not a fan of the "stick-on" function label, but that's just a personal preference. If you're in the market for a preamp to complete your K&K PU's, you won't be disappointed in the K&K XLR Preamp.