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Technology and Performance


Technology and Performance of DelSonix Passive Amplifier and Speaker.



There is a fundamental difference in how sound is generated in an acoustic and in an electric guitar.

In an acoustic guitar, strings are attached to a thin sound board and to the guitar headstock. When plucked, vibrating strings transfer most of their energy to the thin sound board. Sound board vibrations create sound waves, which are amplified in a hollow, resonant chamber.


In a solid body electric guitar, strings are attached to the guitar body and the other end to a guitar headstock. There are very small vibrations in the guitar body, made from a relatively heavy, solid block of wood. Most vibrations are transferred to the protruding guitar neck and headstock. The surface area of the guitar neck is much smaller in comparison to the thin sound board of an acoustic guitar. There is also no resonating chamber and the sound of an unplugged electric guitar is very low.

Practicing unplugged electric can be boring and not always practical due to low sound feedback. Electric guitar is designed to be played with some kind of electronic amplification. Electronic amplification requires electricity, cables, speakers or headphones.


DelSonix Patented Design.


DelSonix passive amplifier provides a convenient option of practicing unplugged electric guitar. It converts and amplifies guitar headstock vibrations into acoustic sound waves. It basically converts any electric guitar into a low volume acoustic guitar.


DelSonix amplifier design is the result of two years of research. It is designed to deliver maximum performance from a unit with a practical, fold-able size for storage and transportation.

DelSonix amplifier consists of a spring clamp, an upright pick-up, and a thin, conical plastic resonator.

The upright pick-up is made of selected, clear wood. Wood has some of the best acoustic properties of natural materials. The upright pick-up is hollow inside and has a specifically designed resonating gap at the bottom. The pick-up is firmly clamped to the guitar headstock with a spring clamp.

DelSonix resonator is attached to the top part of the upright pick-up. It consists of a thin, stiff Polyester film cut out into a square shape. When folded and attached to the upright pick-up, the resonator assumes a conical shape with a Delta shaped base. It has relatively large diameter, which allows for low frequency sound transfer. 

Headstock vibrations are transferred via pick-up to the resonator, which vibrates and generates sound waves like a speaker. The specifically designed pick-up with two stage hollow structure and bottom resonating gap significantly contributes to the device’s loudness. 


DelSonix amplifier is the only device which will allow you to hear the true acoustic tone of your electric guitar. Many master guitar builders state that electric guitar has to have good acoustic tone in order to sound well with electronic amplification.


DelSonix amplifier can be quickly attached to a guitar headstock and its speaker directed onto a player. The net result is a very unique acoustic sound of your unplugged electric guitar. Loud enough to make practicing fun but low enough for playing in your bedroom in the middle of the night. No batteries, no cables, no headphones.


Your DelSonixed electric guitar gives you the freedom to play any time anywhere.


DelSonix amplifier does not contribute significantly to acoustic guitar loudness. Acoustic guitar is loud enough for practicing at home. It could actually be too loud for practicing at night or in an apartment.

DelSonix may boost loudness of small acoustic guitars. It also adds a special sound effect due to stereo sound coming from two sources - a sound hole and DelSonix speaker positioned on headstock.

DelSonix amplification system is protected by US Patent 9,361,862.




DelSonix amplifier works with any guitar but the best results are achieved with bolt on neck electric guitars. Loudness increase for electric guitars and electric bass guitars is 6 to 12 decibels (dB).

Loudness increase depends on guitar construction, size, headstock size and DelSonix amplifier placement.


Human ear can detect 1 dB in loudness increase. Loudness increase of 3 dB is significant.



Loudness Measurement


The following graphs demonstrate the difference in loudness before and after attaching DelSonix passive amplifier to the same electric guitar. The same piece of music was played. A microphone was placed by the left ear of the musician during recording. Recordings were analyzed using Audacity software.



Loudness and frequency graph for Fender Stratocaster electric guitar – playing cords with no pick. Note a significant boost in low frequencies.


Loudness and frequency graph for Fender Jazz Bass fret-less electric guitar. Here also there is significant boost in low frequencies. 

Laboratory set up was used for pick up and resonator design optimization. Special string stroking device was constructed to apply the same string stroking speed and force for loudness comparison.