Among all kinds of audio equipment on the market, when it comes to product shape design and manufacturing technology, I only serve Italians. Their most prominent labels are the appearance design, exquisite craftsmanship comparable to high-grade furniture, and the sound with rich musical flavor and charm. This contact with diesis audio brand caput Mundi floor loudspeakers is such a pair of audio products intuitively related to Italy.

The basic design mode is the first in the world

Diesis audio also produces hi end loudspeakers, amplifiers, and players. However, it may be that it overemphasizes quality. There are not many product models under diesis audio brand. Caput Mundi is the mid range product of the six loudspeakers.

Most of the loudspeakers of diesis audio brand adopt similar basic design: the lower part is a flat bass box, and the top of the box is placed with an independent horn tweeter. The difference between different models lies in the size of the box and the number of units. This basic design is also the pride of diesis audio brand: the world's first speaker manufacturer to integrate the dipole bass unit and the mid and high pitch horn compression unit.

The so-called dipole type sound generating unit means that the unit radiates sound waves both forward and backward. The phase of sound waves radiated forward is opposite to that of backward radiation. That is to say, when the unit diaphragm moves forward, it will produce positive sound pressure in front of the loudspeaker, and when it moves backward, it will produce reverse sound pressure.

The advantages of the horn type medium and high pitch unit are more obvious. Due to the "amplification" effect of the horn sound wave, the medium and high pitch diaphragm only needs to make a small radiation movement to release the sound with sufficient energy and loudness, which can keep the medium and high pitch diaphragm in the best working state and greatly reduce the possibility of distortion.

Unique shape and rich materials

Caput Mundi loudspeaker is a 3.5 frequency division 4-unit design, which is flat and arched from the side: the front baffle is straight, but the back plate is bent inward into an arc. On the one hand, it can maintain the elegant aesthetic feeling, on the other hand, it can eliminate the low-frequency standing wave in the box, so as to achieve a more pure low-frequency effect. The edges and corners of the front baffle are all cut into inclined planes, which is beneficial to reduce the acoustic wave diffraction. The top of the bass box is a huge horn, and the center of the horn is the treble unit and midrange unit installed in a coaxial way, and with a bullet head diffuser, so as to simulate the effect of "point source" as much as possible, and ensure the phase consistency of medium and high frequency.

In terms of materials, caput Mundi loudspeakers are very innovative. In total, it adopts clad 58 composite materials, Corian artificial stone, anodized aluminum, stainless steel, solid wood, PVC and PVC materials developed by the manufacturer. These materials are not randomly selected or deliberately designed, but are integrated with complex design concepts, each of which has its own special effect.

Among them, clad 58 composite material is mainly used for the filter on the back of bass unit. This material is produced by special formula. After mixing mineral powder and special liquid resin material, it is solidified and molded by single pressing mode to ensure its excellent hardness and damping characteristics. Under the same sound pressure output, it will not produce excessive vibration diffusion like solid wood material. Corian artificial stone is used to make whole horn, providing stable performance and various color matching. Due to the characteristics of high strength, light weight and easy processing, aluminum is used to make support unit and horn bracket. Because of its high strength, stainless steel is used to enhance the box structure inside, and because of its elasticity, it is used as the frame of two bass units. Solid wood, with the same strength as MDF MDF, is used to make speaker front baffle. PVC material is used to make the mounting base of frequency divider, the back plate and inner frame of bass unit.

Concentric horn and dipole bass

In the medium and high frequency band, caput Mundi loudspeaker adopts the world's rare concentric compression driver, combined with single horn design, it can provide stable and consistent acoustic output in the range of 600Hz ~ 25000hz. Compared with ordinary loudspeakers, the unique horn shape and size can achieve excellent acoustic projection and excellent off-axis response. It is also because of the horn design of the middle and high pitch that the frequency divider can use as few components as possible to achieve the natural sound with realistic sense and minimum phase drift. The low frequency band is composed of two 12 inch high efficiency subwoofer units with dipole design.

Diesis audio believes that the sound quality of the dipole unit is the best. First of all, its sound is not as dyed as the traditional loudspeaker. Secondly, it has an excellent damping system connected with the filter and does not change the parameters of the loudspeaker box. Third, its sound performance is very natural, even at low power output and low sound pressure. In addition, due to its very low phase noise, it also has excellent detail reduction and resolution capabilities, which is better than most of the traditional speakers on the market.

"Fully fixed" and independent frequency division

For the dipole subwoofer, the sound performance in low frequency band is particularly important in low-level output and low-power output. Therefore, a special differential filtering structure is adopted on the back of the bass unit of caput Mundi speaker, which can minimize the loss of output power. The small angle frame in front of the subwoofer diaphragm further improves the efficiency of the subwoofer.

In addition, the fixing method of caput Mundi loudspeaker subwoofer unit is also very special. Different from the common method of increasing the number of fixed points and improving the strength of fixed position material, diesis audio brand adopts the total fix (total fix) bass unit installation method in its loudspeaker systems. The bass unit and box are clamped together with each other through special structure, and locked with steel panel through thick PVC material, and then fixed with nine M8 screws and screw countersunk holes drilled on clad 58 composite material. A layer of vinyl material is used on the front baffle surface of the loudspeaker, which is tightly attached to the front baffle to ensure good contact between all parts.

In terms of frequency divider, caput Mundi loudspeaker is composed of two separated bass and mid and high frequency circuit board bases. The separated design can also realize the wiring mode of double line division and double amplifier division. The two bases, 10 mm thick and made of PVC, eliminate the contact resistance of traditional insulation materials for better signal transmission. The components of frequency divider are carefully selected by listening test, which have the lowest signal loss as possible, and reach the military standard after dielectric resin treatment. At the same time, the pure copper coil capacitor with low resistance customized according to the manufacturer's requirements is adopted in the signal channel, and it is also selected in pairs during installation to ensure the signal balance.

The caput Mundi speakers are really beautiful in appearance, and their sound performance is just as good. This trial disc of "the best sounds of nature 2019" combines the classic recordings of several famous fever record companies, with high quality. Caput  When playing "Hotel California" by chlara, the Mundi loudspeaker can make the listener feel rich details and a very natural and vivid scene feeling in an instant, even if the volume is not large. There are many details that can not be felt on the speaker in the playing of mujita. For example, the friction sound between fingertip and string is particularly vivid, and the resonance of the piano box is also prominent And the whole sound field is full and three-dimensional, bringing a strong sense of scene.

If you change into Dvorak's "from the new world", the advantages of the dipole bass unit will be brought into full play. The whole symphony is surrounded by a very strong sense, with a particularly rich overtone and afterrhyme. It really feels like being on the scene. In addition, the jumping sense and sensitivity of various instruments are very outstanding, showing excellent dynamic. In terms of low frequency, it is orderly and powerful, showing a sufficient sense of scale.

If you change into Dvorak's "from the new world", the advantages of the dipole bass unit will be brought into full play. The whole symphony is surrounded by a very strong sense, with a particularly rich overtone and afterrhyme. It really feels like being on the scene. In addition, the jumping sense and sensitivity of various instruments are very outstanding, showing excellent dynamic. In terms of low frequency, it is orderly and powerful, showing a sufficient sense of scale.