News estelon, floor speaker in cast cabinet with diamond tweeter

Ark Joya released the floor standing type rear bass reflex type speaker system "XB Diamond MkII" of estelon on March 1st. There are five finishes, Gloss Black, Matte Black, Gloss White, Matte White, and Gloss Cobalt Blue, and the price is 6.38 million yen (pair). [See another image about this article] An ambitious work that plays a role between the already released "Forza" and "YB MkII" with 3 ways and 3 speakers. Utilizing the technology obtained through the design of the flagship Forza, we follow the original cabinet design for casting composite materials. "You can experience a new dimension of Esteron sound that has evolved." All installed drivers are from Thiel & Partner's Accuton brand. A reverse dome type 158mm ceramic unit was installed for the mid range. It has excellent impulse response and very low total harmonic distortion and intermodulation distortion, so music can be played with high transparency. For high frequencies, it is equipped with the same 25mm diameter diamond reverse dome tweeter as the flagship model. Reproduces sound up to the highest frequency (up to 60kHz) without distorting the human audible range. Although diamonds have excellent characteristics, they also cause a lot of harmonic distortion, so it is calculated by Alfred Wasilkov, an engineer who calculates the internal volume and standing waves of the cabinet and handles all products. The crossover network, which is developed based on overlapping listening tests, "only produces immersive'music'in front of you." Similar to the mid range, the low range is equipped with a reverse dome type 220mm diameter ceramic sandwich structure driver unit. Although it is lightweight, it has excellent rigidity and internal damping. The rear bass reflex system is adopted, and one bass reflex port is installed on the back side of a Woofer unit. The tweeter and midrange have independent chambers and are not affected by the woofer unit. It also features an original unit layout, with a midrange section at the top of the speaker, a tweeter section directly below it, and a woofer section at the bottom near the floor. The crossover network section is mounted in the chamber at the bottom of the cabinet, which is physically separated from the chamber in which each driver unit is mounted. The network circuit is optimized for design and materials used. The crossover circuit uses a quadratic curve for the tweeter / midrange and a cubic curve for the midrange / woofer. It is equipped with OFC coils and Mundorf Silver Gold Oil capacitors, and uses high-quality solder to be attached, all of which are assembled by hand by skilled technicians. A pure copper cable made by Kubala-Sosna is used for the internal wiring material that transmits the music signal from the amplifier to the driver unit. The playback frequency band is 22Hz to 60kHz, the crossover frequency is 85Hz / 2.1kHz, the output sound pressure level is 86dB / 2.83V, and the nominal impedance is 6Ω. The speaker terminal is a single wire terminal. The cabinet ensures high rigidity and high density by mixing composite materials with different resonance points (composite materials such as powder and resin) and then adopting uniform integral molding by casting. By further reducing unnecessary vibration of the cabinet, the performance of the installed driver unit is maximized, enabling higher-purity music playback. The precisely designed cabinet shape is extremely complicated, and the structure that eliminates parallel surfaces and the internal surface is beautifully curved suppresses internal standing waves to the utmost limit. Based on acoustic engineering, the driver unit has been placed for the best performance, and proper internal chamber processing has also been applied. Cabinet molding and painting are all carried out in Estonia. The external dimensions are 420 x 590 x 1,260 mm (width x depth x height), and the weight is 69 kg per piece.

AV Watch, Takafumi Sakai