K&K's Ultra Pure onboard active system has been completely redesigned in response to customer feedback. The newly designed UltraPure Preamp features +/-20 db bass/low, K&K's proprietary wide band midrange, and treble/high controls, plus internal gain trimmer. The addition of a phase switch is one of the most important tools for live sound amplification. The system also includes a volume control and low battery indicator. All features are easily accessed at the soundhole. Installing the preamp requires no destructive alteration to your instrument.
The Ultra Pure 12-string system integrates the Ultra Pure preamp with K&K's award-winning Pure 12-string pickup. Three surface transducers are attached to the bridge plate, just in front of the bridge pin holes. They transmit a significant portion of the soundboard because they are not as close to the strings as an under-saddle pickup. Each of the three transducers is designed to pick up a specific string pair, but also "listens" to the adjacent area around the bridge. Unlike saddle-slot systems, the Pure pickups are not under pressure and therefore do not sound percussive or harsh. Additionally, they do not require modification of the saddle or saddle slot. The Pure System reproduces all strings nicely balanced, a known problem with under-saddle pickups.