. . . deep into the music.

The Legend Continues

The Proteus represents the pinnacle of all that Seiji Yoshioka has learned and achieved in his pioneering and perfection of the ring-magnet construction in phono cartridges. Listening to the Proteus on a top turntable and arm combination, the usual audio industry descriptors fail...there is only music, intensely communicative music. The phenomenal resolution can only be understood in musical and emotional terms..."did you hear how he bent that note? ...how could she do that with her voice? You can feel her pain..."

Proteus is the name of an early Greek sea god known for his ability like water, to change forms, flowing from one to the next. This aptly describes Transfigurations Proteus and its chameleon-like ability to become whatever music it sees. Liquid, powerful, delicate, transparent...and teeming with life.

When you are ready to unleash the gods of music hidden in the grooves of your favorite LP's, it is time for Proteus...

PROTEUS – Specifications


body: aluminium, resonance controlled
cantilever: 0.3mm solid boron
stylus: PA (3 x 30µm) solid diamond
core/coils: Ultra grade 3S - µ metal square core with 5N silver coils
magnet: neodymium – front & rear
weight: 7.8g


output voltage: 0.2mV (3.54cm/s, 1kHz)
internal impedance: 1 ohm
frequency response: 10Hz – 20kHz +1.5dB; 20kHz – 40kHz +2dB
channel separation: > 30dB (200Hz - 1kHz)
channel balance: < 0.5dB at 1kHz


tracking ability: > 70µm at tracking force 2.0g at 315Hz
dynamic compliance: 13 x 10 to the minus 6 cm/dyne

set up instructions

recommended loading: > 10 ohms
recommend’ tracking force: 2.0 g
optimum working temp’: 23º celsius
break in period: min. 40 hours

echnical Details

1. Push pull damping

A special compound has newly been meticulously designed and fabricated to provide total stylus/coil alignment and control. It's non-sensitivity to temperature change keeps the damping coefficient stable and improbes tracing accuracy.

2. Twin coils on the cantilever fulcrum

Minimizes dynamic mass and mechanical impedance, enabling instant, accurate reaction to every groove detail, including the ability to handle massive transients without overshoot or break-up.

3. Special alloy core for coil assembly

This increases sensitivity by 35dB, improves signal to noise ratio eliminating a usual source of distortion.

4. Neodymium magnet

Thanks to the much higher induced magnetism of the neodymium magnet in the rear of the double ring magnets, the coil-turns of the generator have been reduced. It is very helpful to reduce the internal impedance to 1ohm, which contributes to the improvement in the solidarity with transparency.

5. Low mass tip

Ogura PA (3 x 30µm) tip shares many of the advantages of this flagship MC cartridge with the Phoenix and Axia. Its function is to reproduce the character of the original recorded sound - not add or subtract its own deficiences.

6. Anti-resonance cartridge body

The solid cartridge body utilizes both shape and material to create a totally inert environment for the electromagnetic elements. These elements are more effectively insulated from arm, turntable and tracing noises, further reducing any tonal coloration of the music and lessening the illusion of distracting mechanical noises.



profundo, 2051 Gattis School Rd. Suite 540/123, Round Rock, TX, USA -- phone: 510.375.8651 info@profundo.us