After more than 25 years of designing and building preamps, Mi-Sis team of engineers proudly introduces a truly significant and unique breakthrough: a high-performance, fully active preamp that does NOT NEED BATTERIES. No 9-Volt, no AA, no AAA, no lithium  NO BATTERIES at all!
Every used battery is a hazardous waste and needs to be properly disposed of to avoid entrance of toxic chemicals into our soils and waterways. Our battery-free technology is environmentally conscious and designed to eliminate this disposal problem.
Our technology is much more than just a battery-free concept. Our preamps have the most natural and the least quacky sound on the market.  Mi-Sis custom linearization scheme allows us to get the best possible sound from a piezo pickup.
Obviously, the less stuff put in the instrument, the better its mechanical and acoustical integrity is preserved. This philosophy is the driving force behind Mi-Si's approach - the minimalistic design with the maximum functionality.

About Mi-Si

Mi-Si Electronics Design, Inc. (pronounced "My-Sigh") was founded in April 2004 by an experienced team of engineers with a passion and a drive to make music technology better - for both artists and music lovers. Although new to the marketplace, Mi-Si's engineers bring an arsenal of expertise and more than 25 years experience in the amplification field, developing exciting and revolutionary electronics specifically designed for acoustic amplification.


Player's Choice Awards 2011 Acoustic Guitar Bronze.


Leo Lindsey of Mele’uhane on Mi-Si

“I love it!!! It looks great, the sound is so natural and warm, and it weighs practically nothing. I want to buy more (if I could afford more :-) ) and install them in all my other instruments and would love to see them in Luna guitars!” – Leo Lindsey, Mele’uhane band


Mi-Si Magpie hits Broadway.

Mi-Si’s Magpie soundhole pickup has passed the audition. Steven Bargonetti, music director, arranger, composer, and guitarist, has chosen Magpie to amplify and represent his acoustic guitars. Bargonetti, who is a regular in Broadway orchestra pits, including “Hair,” “The Color Purple” and the featured guitar player in Pulitzer Prize-winning playwright Suzan-Lori Parks’ “Father Comes Home from [...]


The Reincarnation of Motif

NEEDHAM, MA – Mi-Si announces Motif2, a wholly redesigned first condenser type, high-performance under saddle pickup and endpin-mounted preamp featuring Mi-Si’s now classic battery-free technology.

This breakthrough pickup offers all the benefits of conventional under-saddle applications without distortions inherent in piezo sensors. It’s highly responsive with low feedback, and it allows the player freedom of movement without impairing your instrument’s appearance. It is only 1 mm thick, providing superior contact with your guitar’s bridge and saddle, with much less impact on its structural integrity.

Charge Motif for 60 seconds via the output jack and you’ll have up to 8 hours of exceptional acoustic amplification.