Instructions on how to adjust a live music sound system well and simply

A live music sound system is a complex system of electronic devices that are specially combined. Its main function is to receive the original sound from the stage (vocals, musical instruments), then process, amplify and reproduce the sound so that it is honest, powerful and full of emotion to be transmitted to each audience completely.

However, based on practical experience from installing hundreds of systems of Phuc Truong Audio, we found that having high quality equipment only contributes 50% to success. The other 50% depends entirely on the operator's fine tuning skills.

To have a truly “good” sound system, you need to master the process of controlling each important link in the signal chain. This starts with creating a solid bass foundation through adjusting the subwoofer, optimizing vocals and instruments by adjusting the microphone, ensuring a strong, stable power source through adjusting the amplifier, and finally blending everything into a complete sound system at the mixer.

Join the experts at Phuc Truong Audio Discover the secrets to mastering your sound system, turning complex knowledge into impressive, professional audio experiences!

How to Adjust Subwoofer for Live Music Sound System

Proper subwoofer tuning is key to producing bass with depth, power and speed, requiring an understanding of Crossover Frequency and synchronization Phase with main speaker (full-range speaker). 

According to an internal survey of Phuc Truong Audio In wedding sound systems, up to 70% of problems related to weak bass and lack of power come from incorrect settings of these two parameters. 

To optimize your subwoofer, you need to focus on the following parameters on your signal processor (such as Digital Crossover or DSP):

How to Adjust Microphone for Live Music Sound System

To adjust the microphone for clear sound and minimize howling and hissing, the technician must skillfully use the knob. Gain, filter High-Pass Filter (HPF) and strip Parametric EQ on the mixer. 

Adjusting the Gain to get a loud enough signal, using HPF to remove low frequency noise and using EQ to cut out howling frequencies will help vocals or instruments stand out and be clear on the background music.

Steps to adjust the Microphone on the Mixer:

1. Plug in the Microphone and turn off the Mute: Connect the microphone to a channel on the mixer using an XLR cable and make sure that channel's Mute button is off.
2. Gain (Trim) Settings:
   • Ask the singer or speaker to sing/speak into the microphone at the loudest volume they will use.
   • While observing the signal lights (usually green, yellow, red LED strips) on the channel, you slowly turn the knob. Gain (or Trim) up.
   • The goal is a steady yellow light with occasional flashes of red (Peak/Clip) at peaks. The ideal signal level on the meter is between -6dB and 0dB.
3. Enable HPF (Low-cut):
   • Press the button HPF or Low cutThis filter will cut off frequencies below a certain threshold (usually 80Hz or 100Hz).
   • This action helps eliminate mic “pops”, wind noise, foot stomping and makes the vocals sound cleaner.
4. EQ (Equalizer):
   • LOW (Bass): Reduce slightly around 200-400 Hz if the voice is "buzzed" or "dull". Increase slightly if the voice is too thin.
   • MID (Middle Range): This is the most important frequency range of the singing voice. Reduce slightly around 800 Hz – 1.5 kHz if the voice sounds “nasal” or “boxy”. Increase around 2-4 kHz for clarity and “presence”.
   • HIGH (High pitch): Boost slightly around 6-10 kHz to add some “brightness” and “air” to the vocals. Be careful not to boost too much as this will cause sibilance and feedback.
5. Using Compressor:
   • If available, a compressor helps even out vocal volume, making quieter vocals clearer and louder vocals less harsh.
   • Please place compression threshold at a level where the compressor only works when the singer sings loudly, and set compression ratio keep it low (around 2:1 or 3:1) to keep it natural.

Experience of technicians at Phuc Truong Audio It turns out that with most popular dynamic microphones like the Shure SM58, cutting (subtractive EQ) is always more effective than trying to boost (additive EQ).

How to Adjust the Amplifier (Power Amplifier) ​​of Live Music Sound System

Adjust the amplifier to ensure power compatibility and optimization. dynamic reserve for the entire system. A common misconception is to use the knobs on the amplifier as a master volume control. In fact, these knobs are input signal attenuator. 

Viewpoint of Phuc Truong Audio It is recommended that you set these knobs to maximum (or 80-100%) and control the overall volume using the Master fader on the mixer. This ensures that the amp receives the strongest signal, operates in its most efficient region, and minimizes its own noise.

The golden rule when matching amplifiers and speakers is that the amplifier's power must be greater than the speaker's power. 

A formula trusted by experts is: 

Amplifier capacity = 1.5 to 2 times the Program (Continuous) capacity of the speaker.

For example: A pair of speakers with power Continuous Power is 500W (and Peak Power is 2000W) at 8 Ohm impedance. An ideal amplifier will provide about 750W – 1000W per channel at 8 Ohm.

Why is that? 

Using an amplifier that is weaker than your speakers is one of the leading causes of speaker burnout. When you try to turn it up, the weak amplifier will quickly overload and send out a distorted signal, also known as clipping, this signal will generate a lot of heat in the speaker coil and burn it. A powerful amplifier with a lot of headroom will always provide a clean signal even at high volume levels, better protecting the speakers.

How to Adjust the Mixer of a Live Music Sound System

Mixing is the process of balancing and routing audio sources into a single output signal. Operators use faders to control channel volume, Pan knobs to position sound in stereo space, and AUX sends to create a separate mix for monitors or send the signal to an effects processor.

Basic workflow on Mixer:

• • Reset Mixer: Before you start, turn all the EQ, Pan, AUX knobs to the 0 (12 o'clock) position, and pull all the faders down to their lowest setting. This gives you a clean “drawing board”.
  • Set Gain Staging (As mentioned in the Micro section): This is the most important step. Do it for each channel (microphone, instrument, music source…).
  • Building a Mix with Fader:
    • Start with the most important elements, usually the lead vocal and kick drum. Turn the fader of the lead vocal channel to 0dB.
    • Slowly introduce other instruments (bass, guitar, keyboard…), adjusting their faders to balance the vocals. Ask yourself: Which instrument is the background? Which instrument is the lead melody?
  • Using Panning (Pan):
    • Don't keep everything centered. Using the Pan knob to move audio sources left or right will create a wider, more defined stereo image.

• For example, place the kick drum, bass, and lead vocals in the middle. The keyboards can pan slightly to the left, and the guitars can pan slightly to the right. This makes it easier for the listener to distinguish each instrument.

• • Add effects (Effects – FX):
    • The most popular effects are Reverb and Delay.
    • Use the AUX/FX Send knob on each channel to send a certain amount of signal to the effects processor.
    • Adjust the FX Return fader to blend the “wet” (effected) signal into the overall mix.

• Rule: Use effects sparingly. Too much reverb will make the sound “muddy” and “distant”, while too little will make it dry.

What is a live music system?

A live music sound system is a set of audio electronics configured to receive, process, amplify, and reproduce sound from a live source (such as a singer, musical instrument) to a large audience. Its ultimate goal is not just to make the sound louder, but to deliver the sound with high fidelity, clarity and emotional impact to every position in the listening area.

What equipment does a live music sound system include?

A professional system is built according to a logical signal chain, including:

• Input devices: Microphone (Shure, Sennheiser…) and DI Box (Radial, Behringer…) to convert sound waves or instrument signals into electrical signals.
• Audio mixer (Mixer): The “heart” of the system, can be Analog (Allen & Heath, Soundcraft) or Digital Mixer (Behringer X32, Midas M32) where the signals are balanced, routed and mixed.
• Signal processor: Yes Equalizer, Compressor, Crossover… Today, most of these functions are integrated into Speaker management system (DSP – Digital Signal Processor) like DBX DriveRack.
• Power amplifier: Brands like Crown, QSC, Crest Audio take the line-level signal from the mixer and amplify it to drive the speakers.
• Output devices: Speaker system (JBL, QSC, EV…) includes full range speaker (Full-range), woofer (Subwoofer) and monitor speaker (Stage Monitor) for artists on stage.
• Wiring system and accessories: Signal cables (XLR, TRS), speaker cables (Speakon), stage cable boxes (Stage Box), speaker stands, microphone stands...

Where is the music wave system applied?

The applications of this system are extremely diverse, from events with a scale of a few dozen people to tens of thousands of people. Specifically: concerts in stadiums, theaters, live shows in clubs, sound systems for wedding restaurants, halls, conference centers, churches, and mobile bands.

What factors does a good music sound system ensure?

According to the evaluation criteria of Phuc Truong Audio and the world audio industry, a "good" system must achieve 4 core criteria:

1. Fidelity: Reproduces sound faithfully, without altering the natural color of vocals or instruments.
2. Power and Coverage: The sound must be loud enough and cover the entire audience area, ensuring sound pressure level uniform, no place too big or too small.
3. Clarity and Separation: The listener can easily recognize individual instruments in a complex mix. This is achieved through technique EQ and precise panning.
4. Dynamic reserve: The ability of the system to handle sudden signal peaks without breaking up. A system with a lot of headroom will give the sound a “airy”, powerful and full of power.

Which address specializes in consulting and providing reputable live music sound systems in HCM?

Phuc Truong Audio is a long-standing supplier of audio equipment and home karaoke systems, trusted and highly appreciated by customers in Ho Chi Minh City. With solid expertise, we are also a pioneer in consulting, designing and installing professional live music sound systems for stage, Hall, restaurant wedding party and bar

Phuc Truong Audio is committed to providing comprehensive solutions with outstanding advantages:

• In-depth consulting: Our experienced technical team always listens and designs tailor-made solutions to suit each space and need.
• 100% genuine product: We distribute equipment from leading brands such as JBL, Shure, Crown, DBX…, ensuring high quality and durability.
• Turnkey solutionFrom consulting, design to installation and detailed adjustment, you just need to receive the handover and use it immediately.
• Outstanding after-sales service: Reputable warranty policy, periodic maintenance and 24/7 technical support help your system always operate stably and effectively.

Let Phuc Truong Audio Accompanying you to bring you the perfect sound experience!