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ZS Acoustics-Dynaudio Contour 20i Special Edition

It is a modified, sound-enhanced special edition of the Dynaudio Contour 20i speaker system with an external crossover.

It is modified for the sole purpose of playing to the best of its ability. The manufacturer of the original speaker system took into account several aspects (expectations of the average customer, price, appearance, etc.), which led to compromises. These presented modification, eliminated the compromises. Except for the loudspeakers, the speaker box and the crossover concept, everything was changed.

The best Mundorf capacitors MCap SUPREME SilverGold.Oil are used in the crossover.

The capacitors use high-purity silver and more than 1% pure gold deposited on a polypropylene foil, and the entire coil is impregnated with a special oil. The capacitors thus acquire properties that provide beautiful sound stage and detailed sound with smooth tones.

Furthermore, the best foil coils from Mundorf are used in the crossover. They are made of OFC oxygen-free copper. Electrical and thermal conductivity is the highest in OFC cabling compared to other types of copper. This allows for homogeneous properties and stable behavior. See coil vibration graph. Mundorf foil coils have the lowest vibration and therefore reduce microphone interference. Dynaudio also uses foil coils in the Evidence and Consequence Ultimate Edition series. This achieved a significant reduction in the microphoning of the crossover. The microphone interference is caused by the vibration of the crossover components due to vibrations from the sound in the loudspeaker, which causes interference in the sound.

Instead of ceramic resistor, M-Resist Ultra and Supreme custom-made copper-manganese film resistors from Mundorf are used in the crossover, which have no inductance compared to ceramic ones. The resulting sound at higher frequencies does not sound as grainy as when using the original ceramic resistors and have a natural sound delivery.

The crossover follows the functional parameters of the components according to the original Dynaudio design, but higher quality crossover components with lower tolerances allow it to stand out as a high-quality speaker driver.

ZS Acoustics Tenor foil speaker cable is used for internal cabling. All connections are soldered with AudioQuest's high-quality silver and lead-free tin, and in addition, the connections are tinned under pressure. Tin is not directly in the signal path.

Inside the speaker boxes, high-quality sound-absorbing sheep wool is used, precisely processed for this purpose, which has better balanced sounding properties than the synthetic acoustic foam/felt originally used. Synthetic acoustic foam/felt dampens to much high frequencies, so it kills high tones. Internal reflections partly at high frequencies penetrates through the loudspeaker diaphragm, so the absorption of the material inside the box is important not only at low frequency. The 3.6 Khz low-midrange woofer plays at minus 6db volume.

I recommend a high-quality amplifier for the speakers so that the sound properties stand out more. With a good amplifier, they also emit lower frequencies than originally described by Dynaudio in the technical data.

Although these changes increased the price of the speaker, the sound reproduction improved so much that it was worth it. The ZS Acoustics-Dynaudio Contour 20i speaker system has acquired such sound properties with this modification, which even some expensive higher models do not have and competes with them in terms of sound.

I highly recommend listening to it.

The modified, sound-enhanced speaker system ZS Acoustics-Dynaudio Contour 20i Special Edition has a 2-year warranty

Price:

2480  Eur

2980,- Eur with Baritone internal cables

3480,- Eur with Tenor internal cables

3975  Eur extern crossover, foil coils and with Baritone internal and connecting cables

4999  Eur extern crossover, foil coils and with Tenor internal and connecting cables

Technical specifications:

Two-way design with rear bass reflex, frequency range 39 - 23,000 Hz (-3dB), sensitivity 86 dB, power according to IEC: 180W, nominal impedance: 4 Ohm.

With the integrated NAD-ZS Acoustics C375BEE amplifier in a 25m2 listening room at the Audio Video Kino exhibition, he played from 25Hz

- high-end bookshelf speakers from the Contour i series

- 28mm Esotar 2i with Hexis inner dome

- 180 mm mid-bass driver made of MSP material

- spider suspension made of aramid fibers

- premium wooden cabinet with a rigid aluminum baffle

- fearless Danish design in two luxurious finishes

- designed and engineered in Dynaudio's laboratories in Denmark

This improved version with an external crossover had success at the Audio Video Kino 2024 exhibition where Audiophile High End Audio from the United States noticed us and we aroused their interest.

Link to their video https://youtu.be/WEAnnIqN3cc?si=sUQEEMgAciQLyPLz

Our video about the exhibition https://youtu.be/RQAsqQVoox4?si=ZOKAyw6UJ0g2b1LH

Listening to it

The table shows the absorption coefficients of sheep wool (red) compare to the acoustic foam.

Sheep wool is more balanced and more effective at low frequencies than foam. Higher frequencies are absorbed too much by the foam compared to the middle and low tones, so we hear the reflection of the sound as if it were making the high tones dead.

Measurements and more info:

Measurement and more info:

Sound absorbing materials Professor Phil Joseph

Characterization of Sheep Wool as a Sustainable

Material for Acoustic Applications