Beauty in the world follows in it's proportions the golden section!

We at Trenner & Friedl deal with these natural phenomena for more than 25 years.

Not only to create beautiful speakers, but above all to achieve a harmonious and natural sound.

But no speaker was as close to this goal as PHI:
The inner division, the special bracing, the milled segments of the front to prevent bending waves, the driver unit, the cables, the derivative of the Structure-borne noise with different speeds of sound:

All this submits to the golden ratio.

Phi is a point source that is clearly designed to work in harmony with high-end amplifiers. With the special eye and attention to fine tube amplifier.

PHI
The poetry of the golden section, the sound of nature.