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ACS has carefully prepared to bring several newly developed products to meet customers and friends from around the world. On the first day of the exhibition, friends from all over the world came to learn about new products, negotiate projects, consult and cooperate, and so on
The sound system that picks up the microphone has the possibility of feedback howling. The harm of microphone whistling is significant, mainly manifested in the following aspects:
1. When self-excited, the power amplifier will produce a large power output, which may exceed the capacity of the sound reinforcement equipment and burn out the power amplifier and sound producing equipment.
2. When the feedback coefficient is close to 1, due to the comb filtering effect, the superposition between the delayed sound field and the direct sound field will cause the amplified sound field to be less than the original sound field
Narrowing in sound sense.
3. The delayed feedback of the speaker sound field will cause a series of delayed echoes throughout the entire system, and this echo will exacerbate the comb filtering effect, resulting in significant
Distorted reverberation, trailing sound, and just sound distortion.
4. The sound pressure output during whistling is very high, which seriously affects the atmosphere of various activities.
Eliminating feedback howling starts with the necessary conditions for generating feedback howling. As long as one of these conditions can be broken, the goal can be achieved. Here are the top 5 recommended by Guoshi
A method to eliminate microphone feedback howling
1. Eliminating microphone feedback howling using inverse cancellation method
Anti phase cancellation to prevent self-excitation is common in high-frequency amplification circuits. Two microphones of the same specification can be used in the audio amplification circuit to pick up direct sound and reflected sound, respectively,
By using a reverse phase circuit to cancel out the reflected sound signals before entering the power amplifier, it can effectively prevent self excitation of whistling
2. Adjusting the distance method to eliminate microphone feedback howling
One of the most effective ways to avoid whistling and increase the amplification volume is to pick up the microphone as close as possible to the sound source, while using a non directional microphone. here
To be clear, directional microphones (especially sharp directional microphones) have very little pickup attenuation from distant sound sources. Adjusting the distance plays a role in increasing the amplification volume and preventing whistling
Not big. Whether the sound reinforcement system is prone to howling is not directly related to the sensitivity of the microphone. However, highly sensitive microphones are highly directional and prone to squealing
It's just that. Shortening the distance between the sound equipment and the audience can actually improve the loudness of the amplification. The total gain of the system can be appropriately reduced. If accompanied by broad directional
A near field speaker, with the microphone slightly away from the speaker, can avoid howling
For the direct feedback sound field of speakers, the farther the microphone is from the speaker, the better, and the closer the speaker is to the audience, the better. The microphone should be placed in the radiation direction of the speaker
On the back, if the microphone is likely to be carried around, the speaker should be placed in a place where the microphone cannot be very close
3. Phase modulation method to eliminate microphone feedback howling
The self-excited howling of the amplifying system has a positive feedback loop. If the microphone signal is phased, it will disrupt the phase condition of self-excited howling, thereby preventing the system from self excitation
Screaming. There is data indicating that the stability is best when the phase deviation value is 140 °; Moreover, the higher the modulation frequency, the better the stability of the system. To facilitate processing
The subsequent sound quality does not experience significant distortion, and the maximum allowable value of its phase modulation frequency is 4Hz. Finally, after adjusting various equipment, never let others move around,
Including some DJs who are not familiar with equipment performance and only know how to turn it on, off, and adjust the volume
4. Feedback suppressor method (narrowband notch method) to eliminate microphone feedback howling
The PV series provides controllable diffuse radiation and a wide rated horizontal radiation coverage. For places such as auditoriums, bars, shopping malls, etc. that require the combination of acoustic environment and sound column arrays, there will be perfect application systems. Because the playback environment requires a more three-dimensional sound effect delivery system, the PV series can provide high-quality and excellent music reproduction effects. Paired with a suitable subwoofer, using it will showcase a more perfect sound effect on the venue.
It can be used in various occasions: banquet halls, multifunctional halls, auditoriums, gyms, bars, shopping malls, mobile performances, public places, etc
The PV-12C is equipped with a compact Super low frequency system with a built-in power amplifier module, and uses a long stroke rubber side woofer. Compact and powerful low-frequency effect, flexible placement, and convenient transportation; Meet the application requirements for larger audiences and larger areas.
The PV-603 is composed of six 3-inch full band Italian imported speaker units, with the advantages of thick and prominent mid frequency performance, clear sound quality, and high hardness material used in the wooden box. Suitable for large-scale language reinforcement, music applications, and small to medium-sized performances. Application occasions: banquet halls, multifunctional halls, auditoriums, gyms, bars, shopping malls, mobile performances, public places
The professional column style PV series is specifically designed for compact sound reinforcement systems, and the series speakers can accurately control vertical directionality to meet professional audio quality installation requirements.
The MU series is a dual frequency system that can be used as a small matrix source (M) and a point source (P) speaker system, respectively. A 3-inch neodymium magnetic tweeter compression drive unit, a rectangular planar waveguide radiated high-frequency horn (PSAM) system using a 175-inch voice coil and to be developed for this purpose. The rated frequency range is from 55Hz to 20kHz, and the Xs series can be used as a single module with a coverage angle of 90 ° X30 °. By rotating the 90 ° horn and designing the box to a 50 ° receiving elevation angle, it can also be used as a stage monitoring aid. It can also be composed of two modules that can rotate 90 ° through the waveguide, stacked or suspended on the ground, providing nearly 60 ° × 90 Ho coverage horizontal constant curvature and constant beam width array, used as a single horizontal matrix system, has a 60 rectangular Wavefront with constant beam width and controllable frequency as low as 600hz on the horizontal plane, and improves the projection ability and sound pressure
Product characteristics:
Compact multi-purpose full frequency System integration Compact multi-purpose full frequency system integrating the best driver unit and point source array waveguide technology
Characteristics:
Fever level Neodymium magnet treble drive unit and rectangular radiation field waveguide horn system
The compression drive unit uses a patent number and includes planar waveguide integrated field technology to reduce gate side reflection. The Neodymium magnet driver unit contains a triple tone circle to ensure extremely low distortion and increased power rating.
Extremely low distortion aerospace magnet cone drive unit
This improved long-stroke bass driver unit from the previous generation includes a high-throughput linear magnet with a triple voice coil, ensuring extremely low distortion and increasing rated power.
system integration
The MU series speakers not only integrate specialized passive splitters to ensure linear frequency and phase response, allowing them to operate without the need for external processors. It can significantly represent the entire system, including
Full frequency mode or stage monitoring applications, or different applications such as using subwoofers to provide the best annoying response
Accessories and Hardware
The MU · series speakers have specially optimized M8 suspension points for various fixed installation and touring performance applications
Other features:
·Best Sound Quality
·Maximum output performance and reliability at the same level
·Rectangular planar wave radiation front with smaller sidelobe leakage
·Competitive prices
MU series compact full frequency system
·Extremely compact and versatile box design
·Radiated sound field of rectangular planar waveguide
·Patented Point Source Array Waveguide Horn (PSAM) * Design
·Multiple hanging points
The superior sound quality of the MU series is designed specifically for near field applications, with excellent driving units and symmetrical waveguides with rectangular plane wave coverage angles ensuring the demand for pure high fidelity sound.
The MU series can provide a smart solution for fixed installations, bands, small clubs, 51 ring channels, company meetings, or stage monitoring
Guangzhou Gedi Audio Equipment Factory is a comprehensive enterprise that integrates research and development, production, and sales. Mainly engaged in high-quality "ACS" brand professional audio. The products include linear array speakers suitable for various outdoor/indoor performances, long-range speakers, full frequency and ultra-low speakers of various specifications, digital amplifiers, etc.
The VR-210P is a compact vertical linear array system, which has clear language clarity, enough dynamic, beautiful sound quality, and a strong medium and low frequency that can only be realized in a much larger Type system. VR210P can be used for fixed installations such as large-scale mobile performances, auditoriums, and sports venues.
Product characteristics:
★The tweeter unit uses two 1.75-inch neodymium magnetic units, and the high-performance tweeter driver makes high-frequency frequencies more delicate and transparent. When working at high power, the distortion is smaller, and the listening sensation of the connection part with the mid to low frequency division is better, thick and round.
★Two 10 inch neodymium magnetic bass units are used for the bass part, with a high output mid bass driver. This increases the available output of the bass driver at low frequencies, increases sensitivity, improves sound pressure level, improves directionality, and increases the horizontal and vertical frequency division points of the speaker bass driver unit. Suitable for outdoor use with a unique paper basin formula, the ketone body of the paper basin will not regain moisture with changes in the humidity of the use environment, as with ordinary paper basins
Each full frequency speaker of the VR series fully conforms to the principle of linear array. The selection of the spacing between the high-frequency Wavefront converters, units, and frequency dividing points are consistent with the theory of linear array. VR110P applies coaxial array technology to solve the problem of directional narrowing caused by interference between medium and high elements near the frequency division point of conventional linear arrays, and also solves the problem of acoustic image deviation. The application of the phase plug panel effectively solves the horizontal interference problem of the dual unit structure, and reduces the acoustic modulation from low frequency to high frequency caused by the Doppler effect.
