How to install and debug KTV speakers?

KTV sound amplification must ensure several basic factors: sound pressure level, sound field uniformity, clarity, reverberation, and basic electronic acoustics knowledge of some equipment.

Sound pressure level: To put it simply, at least the power of the sound system must be sufficient. How much power should be allocated to the size of the private room? This is the first thing to ensure. Generally, the optimal sound pressure range of KTV private room speakers is between 2.5 and 2.8 meters. In other words, you'd better make the distance between the hanging position of the speakers and the sofa singing area close to this. If you don't believe me, you can test it and hold it. Slowly move the microphone from the sofa to the speaker to see if singing is best in this distance range.

Sound field uniformity: The installation position of the speaker is very important. The hanging position of the speaker should be reasonably arranged according to the horizontal and vertical diffusion angles of the speaker, as well as the horizontal and vertical rotation and pitch angles, to ensure a uniform sound field in the listening area. .

Clarity: Reasonable room design and layout, proper sound absorption and diffusion are simple ways to ensure the clarity of sound amplification. If the room uses a lot of glass, mirrors and parallel smooth walls, appropriate Add sound absorption and diffusion measures to the location. The main method is repeated testing. If the room already has a lot of sound-absorbing materials and cannot be removed, you can refer to the frequency division design of the existing speakers to modify the speakers, such as increasing the number of tweeters. It is recommended to use a 2.5" cabinet tweeter to make up for the excessive absorption of the tweeter. , increase the clarity of treble; too much low frequency will also affect the clarity of the room. If you try to attenuate a lot in the tone part, it will cause signal distortion. Too much is not enough. There is a trick you can try: spray self-spray paint on the woofer unit, often It needs to be sprayed several times, and the specific situation will be analyzed in detail, so that the woofer cone changes its characteristics and is biased towards the mid-frequency. Haha, try it again. The bass is also related to the installation position of the speaker. It is also appropriate to adjust the position of the speaker to find the best balance point. One way.

Reverb: It includes architectural reverb and electroacoustic simulation reverb. The architectural reverb comes from a mature decoration designer and fully considers the architectural acoustic characteristics in small spaces. Sound reflection, diffusion, absorption and other indicators, such as furniture layout, wall design, wallpaper selection, sofa material and other factors, as debugging, the main thing we can control is electroacoustic reverberation. Traditional karaoke amplifiers can only simply Using ECHO (echo) to simulate real-life reverberation has poor effect, and the earlier echo processing chips: M50195, 65831, etc. have too narrow frequency response range and poor effect. Nowadays, mainstream karaoke amplifiers use DSP effect processing, and the frequency response is poor. The sound range can reach 23K, which can fully meet the requirements. DSP technology is mainly provided by Taiwan's OPS, Guangzhou's Oudi, Wanli and other manufacturers.

Let's talk about on-site debugging. The first important thing is the microphone. Many people use stage sound reinforcement microphones as private room microphones. I have a different opinion. Stage microphones are about flat frequency response and a very small distortion range, while KTV wants to entertain the public and needs reasonable distortion and frequency. There are special requirements for the sound range, which is not 20Hz ~ 20KHz, which is the best performance range for karaoke. It mainly highlights the mid-to-high frequency band of the human voice, so that the energy of the human voice is concentrated to achieve clear performance and effortless singing. Then there is the stage microphone It is not suitable for a relatively harsh environment like KTV. It is easy to break. The life of the microphone core and switch is not long enough, and the cost of use is high. Different microphones have different sound characteristics and output levels. For karaoke amplifiers or preamps, The adjustment of the microphone volume (not the total microphone volume, but the microphone gain) is particularly important. If the gain is not enough, the details of the microphone will not be amplified enough, and the singing will be laborious, unclear, and not full. If the microphone gain is too large, the amplifier output will be distorted, resulting in muddy bass and treble. Breakage is prone to feedback feedback, which requires repeated testing by the tuner, which is also the most important step