Danish Zunbao speaker terminology
WaveGuide
Waveguide technology refers to a special shape tweeter panel designed by Zumbo. This technology produces a controlled sound pointing feature that produces a more open and dynamic sound. Waveguide technology also makes it easier to position speakers in a room. Another major challenge is to ensure that the treble and midrange have consistent pointing characteristics. In general, the higher the frequency, the narrower the pointing characteristics become. Therefore, in a region where the center/woofer unit needs to be smoothly combined with the directional characteristics of the tweeter, the mid/woofer unit should have a relatively narrow directional characteristic, and the tweeter should have a relatively wide directional characteristic. This problem has been solved with Zumbo's waveguide technology. The waveguide also reduces the diffraction of the sound to a minimum. Finally, the waveguide can increase the output of the high frequency and low range, which means that the tweeter requires only a small push power in the case of the same output sound pressure. Therefore, the withstand power is increased and the distortion can be reduced. 
2. HCC (hard cone technology)
The HCC (Hard Cone) technology allows the speaker unit to reach frequencies far above the intermediate frequency before significant splitting vibrations occur. The rigidity of the material and the shape of the conical diaphragm ensure that the horn unit produces clear, detailed sound even at loud pressures with minimal distortion. The natural rubber folding ring can effectively prevent the vibration from being transmitted back to the diaphragm. The result is a well-controlled diaphragm that can operate at frequencies up to 4 kHz without splitting vibrations – far beyond Its working frequency range.
The waveguide keeps the treble diffusion pattern from 10 kHz up to the critical crossover frequency of 2 kHz, thus ensuring a seamless transition to the mid/woofer unit, regardless of whether the listener is in the axial or off-axis position. Jamo HCC avoids splitting vibrations, and splitting vibrations occur in other speaker units. 
3. The center phase plug center phase plug is used to replace the traditional dust cover, which can make the cone lighter and more responsive, and also help the voice coil to cool, thereby increasing its power consumption and making it at a high volume. The sound is more stable. This technology can increase the power of the speaker unit and play a more balanced, accurate and dynamic sound.
The central phase plug also prevents potential splitting vibration points formed by the dust cap and the cone. In addition, it can avoid positive or negative pressure formed behind the dust cap due to the forward and backward movement of the cone. The advantage of this technique is the ability to achieve more dynamic and more accurate sound reproduction. 
4. DTT (damping high-pitched technology)
DTT (Vibration Damping Technology) is a special installation method developed by Zumbo. One of the biggest challenges in speaker design is to prevent blurring or acoustic staining caused by harmful cabinet vibrations. High frequency sounds are especially susceptible to this effect. This problem has been solved with Zumbo's DTT technology.
Due to the isolation damping between the tweeter and the rest of the cabinet, the vibration transmitted from the front baffle to the tweeter is cut by more than 20 dB, making the high-pitched details very rich and realistic. There is a central phase plug compared to the sound pressure level of a speaker without a center phase plug. 
2.5 frequency division
This unique structure combines the advantages of two-way and three-way: a two-way continuous smooth sound reproduction and a three-way wider low-frequency extension and greater power handling. The specific method is to add a woofer to a full-band two-channel system to enhance the bass playback capability. In this band, only a larger cone can push enough air and withstand more power.
Active impedance correction
Active Impedance Correction (AIC) is the result of innovation and expansion based on previous methods for reducing distortion in electric speakers. AIC can get a clearer midrange, significantly reducing the roughness of the sound, which is especially noticeable in vocal playback. From the indicator point of view, this method can reduce the third harmonic distortion by 6dB (equivalent to a 50% reduction).
Automatic power switch
This feature allows the subwoofer to automatically turn on when an input signal is received, and automatically enters standby if there is no input signal for about 20 minutes. So once the subwoofer is connected, you don't have to worry about it.
Boundary gain compensation
A boundary gain compensation filter is used to compensate for the effects of the room on the low frequencies. Any room will amplify the lowest frequency sound, depending on the size of the room and the location of the listener. In general, the closer you are to the wall, the greater the amount of magnification. This effect can cause excessive bass. In an average size room, the bass boost starts from about 60 Hz. As the frequency decreases, the boost will increase further. A maximum of 5-10 dB will appear between 20-30 Hz. Peak!
When I first heard this sound, I thought it was good, but I soon felt that the sound was loud and sizzling, especially when listening to music, it was caused by too much bass. People hate. Boundary gain compensation ensures very good linear low-frequency response in the room and makes the choice of speaker placement and listening position more flexible.
Coaxial drive unit
The coaxial drive unit (combining the tweeter with the mid/woofer unit) ensures that both units have the same acoustic center, allowing high frequency and low frequency sound to reach the listener's ear at the same time. Even if the listener is in a horizontal or vertical off-axis position, the correct phase of the sound is guaranteed.
Convex tapered inversion hole
The shape of the inverted tube is also very important, because at high volume, the airflow that quickly passes through the inverted tube can be disturbed, resulting in acoustic staining.
Zunbao's well-designed, evenly spread (convex-conical) inverted tube improves airflow and reduces nozzle noise. In fact, this design can increase the sound pressure level of the speaker by 5dB before the nozzle noise occurs.
Cut-off frequency
The continuously adjustable level, phase and cutoff frequency allow the subwoofer to be perfectly matched to almost any speaker on the market and can be adapted to different placements and personal preferences.
Dipole
Dipole means that the sound radiates outward from the front and the rear in opposite phases. The reason for using dipole surround speakers is not to make it impossible to point out their physical location, but to create a "3D" ambience in the surround sound field, giving you an immersive feel. The dipole front speakers radiate sound from behind and will be reflected by the back and side walls before reaching the listener's ear, causing a delay. The secondary reflections add an atmosphere to the sound and make you feel that your room is getting bigger.
Double coaxial diaphragm
This is a very unique tweeter with a coaxial dual diaphragm and a vented magnetic circuit system.
This technology reduces the operating frequency of the tweeter to a lower limit of 1 kHz, enabling a smooth and seamless connection to the midrange unit with an upper frequency limit of 40 kHz, which fully satisfies the requirements of the new digital multi-channel format.
Electronic Overload Protection (EOP)
Once an overload occurs, an electronic PTC resistor can limit the amount of energy sent to the speaker. When the volume is turned off, the resistance will cool down and the sound will return to normal.
Glass fiber/adhesive composite
A composite diaphragm made of fiberglass/adhesive helps to control and evenly distribute the waveform, ensuring minimal acoustic staining and very transparent midrange playback.
Level
The continuously adjustable level, phase and cutoff frequency allow the subwoofer to be perfectly matched to almost any speaker on the market and can be adapted to different placements and personal preferences.
Limiter
The limiter is used to prevent overloading of the subwoofer amplifier caused by excessive input signals. Regardless of the amplitude of the drive signal, it ensures that the subwoofer is fully controlled and keeps the sound clean and clear.
Dynamic feedback (MFB)
When a large woofer is suddenly driven by a strong sound pulse, such as an explosion or a timpani, the woofer will continue to vibrate for a while after the sound pulse is over. The MFB circuit compares the movement of the woofer with the sound pulse. If the movement of the woofer does not match the input signal, the MFB circuit corrects the error before it becomes audible. In addition, the MFB can make the low frequency dive deeper without losing accuracy. The result is an impact and dynamic, extremely accurate and deep bass.
MPD IF phase spread
This unique Zumbo technology is equipped with an inverting-connected midrange unit on the other side of the two-way surround speakers to obtain a diffuse surround sound reproduction of a typical dipole speaker, while at the same time gaining fullness. The bass, which is what traditional design lacks.
Neodymium magnet
Tantalum is a ferromagnetic material with a magnetic force 10 times that of ordinary magnetic materials. Since the size of the magnet can be made small, it can be placed inside the voice coil, so that the magnetic force is concentrated around the voice coil, that is, the area where the magnetic force is really needed.
Phase
The continuously adjustable level, phase and cutoff frequency allow the subwoofer to be perfectly matched to almost any speaker on the market and can be adapted to different placements and personal preferences.
Slot-type inverted hole box
The slotted inverted hole housing structure allows for deep tuning and greater power handling and better sound fidelity. In addition, the integrated phase-inverting holes ensure better rigidity and stability of the cabinet.
XBR (Extended Low Frequency Response)
With Zumbo's unique XBR (Extended Low Frequency Response) technology, surround speakers can behave like mid-range speakers in the middle and high frequency bands, while in the bass band they behave like bipolar speakers. The surround speakers have a diffuse surround effect and a full bass.
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