Sound Samples

Want to hear what a phase switch does? In this demo I play a short melody line on my Martin DM with the Pure Mini and the Pre-Phase directly into my Fender DeVille tube amp (that's right folks - I like this one even for my acoustics!). All EQ is set flat, no effects. The first take is "out of phase," the second is "in phase." I used a microphone positioned in front of the amp to record the difference.

I purposely choose some notes which clearly indicate the trouble of "out of phase" sound. You may have experienced a similar phenomenon yourself. On the first take, the E (on the A string 7th fret) is badly out of phase, it rings rough, dirty and it feeds-back. With the proper phase setting in the second take everything sounds clean and balanced, with a fuller tone overall. All I did was use the little phase switch on the Pre-Phase.

Right-click to download: Phase Switch Demo

Pre-Phase Preamp

About the Pre-Phase Preamp

The Pre-Phase Preamp is a miniature, onboard preamp that provides volume control and a phase switch for Pure pickups. It provides truly astonishing sound quality in an extremely small and light-weight package!

The addition of the phase switch is one of the most important tools for live sound amplification of any acoustic instrument. Your unplugged acoustic guitar resonates in a given phase. The amplified sound needs to match this phase! Out of phase sound feeds back, has phase cancellations on some notes, and sounds quacky and tinny overall. Phase problems cannot be sufficiantly solveld with EQ. Any amp/PA/effect-unit/preamp may or may not flip the phase, the only way to be sure that your guitar is in phase with the amp-sound is a phase switch in your signal chain! In our opinion a phase switch is the #1 control for any amplified acoustic instrument.

The volume control wheel allows for convenient adjustment during performance. With the Pre-Phase you are able to plug your acoustic guitar into any amp or PA directly. Simply use the EQ on the amp or mixer channel to adjust your tone.

Battery life is about 150 hours with alkaline battery.

You can order the Pre-Phase as an integrated element with any single-source passive pickup, or as an Add-On for an existing pickup. Simply unscrew the existing endpin jack, remove it from the endpin hole, and plug it into the 1/4" plug of the Pre-Phase Add-On. The 1/4" plug has a self-adhesive fastener, which can be secured inside the guitar. The lightweight thumbwheel control mounts with a peel-and-stick installation to the inner edge of the soundshole. Mount the new endpin jack into the endpin hole, and you're done!

Pre-Phase Preamp Add-On $109

Pre-Phase + Pure Mini $239

Pre-Phase + Pure Classic $269

Pre-Phase + Pure 12-String $239

Purchase from a licensed K&K Dealer
No dealer in your area? Buy Direct from K&K

©K&K Sound Systems Inc | The Acoustic Pickup Authority

92798 Cape Arago Hwy, Coos Bay, Oregon 97420 | 541-888-3517 | Toll Free 1-800-867-6863 |