Portable bridge-mounted piezo with built-in wireless capability and volume control for violin or viola

KNA's innovative approach enables violin and viola players to have freedom of movement while bringing the natural tone of their instrument to an amplifier or mixer.

The system includes a rechargeable transmitter and receiver, and everything needed to plug in and play.


Integrated wireless system

KNA VV-Wi incorporates a wireless signal transmission for a reliable, stable and cable-free connection to an amplifier, mixer or audio interface. The built-in UHF transmitter offers performers a high-fidelity sound with the ability to move around the stage freely. 

Optional wired connection

For the studio or other times when a wireless connection isn’t needed, VV-Wi plugs in with a regular 1/8″ audio cable.   

Safe install

Mount the pickup jack housing on the lower bout, just below the waist on the 4th (G) string side of your instrument. Adjust the height of the barrel clamps to tighten the pickup to the instrument.

Onboard volume control

Players can control their output signal onstage or in the studio by clicking the onboard "+" and “-“ buttons. 

Wooden transmitter housing and sensor

The transmitter housing is encased in laminate birch with an elegant and stylish mahogany top. The piezo sensor has a lightweight wooden casing to achieve maximum tonal sensitivity. 

Natural sound

VV-Wi has a passive piezo design that reproduces the instrument's authentic voice.

Protection for your instruments finish

The adjustable clamps have protective padding at each point of contact to prevent damage to your instrument’s finish. 

Great compatibility with many sizes of violin and viola

The pickup comes with universal size barrels to attach the jack housing equally well to both violin and viola bodies with just a few turns.



Follow our installation guide through the following steps:

Choose the most convenient place for the jack housing depending on the type of your chinrest, size of your instrument and your playing technique. We recommend installing the jack housing on the left (G string). Some players prefer to install it on the right side, which works just as well.

Extend the clamps by holding the pickup and the bottom feet of the clamp while loosening the center barrels. After choosing the desired position, tighten the barrels with the provided metal key.


Some bridge slot openings will need to be widened slightly. We recommend 400 grit sandpaper, folding the paper appropriately to make it sturdy. If possible, use a thin piece of plastic or metal plate between the sandpaper. This will help while sanding and keep the sanded surface flat, which is important. Before you start sanding, use appropriately cut cardboard placed around the bridge to protect the varnish of the instrument. Widen the slot slowly, stopping frequently to try attaching the pickup sensor. This will avoid making the slot too wide.

Install the sensor into the horizontal eye slot of the bridge on the 1st (E) string side, so that the cable is on the outer side of the bridge. Hold the bridge with your free hand so it does not move while installing the sensor. The sensor should fit tightly but install without force. It should not move while playing or even shaking the viola, but not too tight where the sensor or bridge can be damaged or broken.

With the volume off, plug the receiver into your favorite high-impedance acoustic amplifier. The output of the receiver is 1/8″ (3.5mm). The included adapter can connect most amplifiers and audio equipment, which have a 1/4″ (6.35mm) input. The pickup also supports a wired connection to equipment via an instrument cable with a 1/8″ (3.5mm) male jack that plug into the transmitter’s input. Hold the transmitter with one hand while attaching and detaching the cable.

Turn on the transmitter, long press “+” for 5 seconds, and when the blue light flashes quickly, that indicates that the pairing status has been entered. Turn on the receiver, and the blue light will flash as it’s pairing. When the blue light is solid, you’re ready to enjoy your new pickup. 

Video Review


Weight 45gr / 1.6oz
Wood Laminate birch and mahogany top
Maximum Impedance 1500 Ω
Potentiometer 500 kΩ
UHF Frequency 550 Mhz-589 Mhz
Audio Sampling rate 48 Khz
Frequency Response 20-20 Khz
Performance Time Approx. 6 hours
Internal Power Supply Polymer lithium-ion battery
Wireless Range 50M line of sight
Specified part Letter Size in MM (from*) Size in MM (to*) Size in INCH (from*) Size in INCH (to*)
Pickup sensor side diameter a 12,0 12,1 0,472 0,476
Pickup sensor side diameter b 12,0 12,1 0,472 0,476
Pickup sensor side diameter with extension c 12,7  12,8 0,500 0,504
Lead wire length d 135,0 - 5,315 -
Jack housing width e 33,0 33,1 1,299 1,303
Mounting bracket and 23mm barrel tightened  f 31,0 31,1 1,220 1,224
Jack housing height g 14,0 14,1 0,551 0,555
Mounting bracket and 29mm barrel untightened  h 51,0 51.1 2,008 2,012
Pickup sensor thickness i 1,9 2,0 0,073 0,079
Jack housing length j


- 2,756 0,000
*Our handmade pickups may vary slightly in size due to the nature of the building

Sign up for news & offers

Stay up to date with our latest news and product information