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In the process of undertaking professional audio engineering projects for clients, it's common to encounter a variety of challenges. To help address these issues, I've compiled a list of the most frequently encountered problems and shared some insights on how to deal with them effectively. Here are the key points:
1. **Signal Distribution Issues**
When multiple sets of speakers are installed in a professional audio setup, signals are usually distributed through an equalizer to various amplifiers and speakers. However, this often leads to mixing of different brands and models of amplifiers and speakers, which can result in problems such as mismatched impedance, uneven level distribution, or insufficient power for each speaker group. Additionally, using an equalizer for frequency adjustment may not be sufficient to properly shape the sound field and speaker performance.
2. **Graphic Equalizer Adjustment Problems**
A common issue with graphic equalizers is that engineers tend to adjust the EQ based on imagined ideal spectrum shapes—like "swallow," "mountain," or "wave" types. In reality, the actual spectral shape required at the site is quite different. The ideal curve should be smooth and stable. If adjustments are made based on assumptions rather than measurements, the final sound quality may suffer significantly.
3. **Limiter Adjustment Challenges**
One frequent problem with limiters is that they either fail to function at all or are over-adjusted, leading to adverse effects. When a limiter isn't working properly, it might still allow the system to operate, but if it's set too aggressively, it can cause the vocal levels to drop when the background music is strong, making the performer feel out of control.
4. **System Level Adjustment Problems**
Improper placement of the amplifier sensitivity knob or failure to perform a zero-level adjustment can lead to instability in the sound system. In some cases, even a slight push on the mixer channel can cause a large increase in output, affecting the overall fidelity and normal operation of the system.
5. **Bass Signal Processing Issues**
Two common mistakes include using full-range signals directly to drive speakers without an electronic crossover, which can lead to poor low-frequency response, and not knowing where to extract the bass signal from the system for proper processing. This can create confusion during live sound operations and affect the clarity of the mix.
6. **Effect Loop Processing**
It’s important to use post-fader signals for effect loops to prevent feedback issues caused by microphone whistling. Returning the processed signal to the channel also helps maintain better control and makes adjustments easier during the event.
7. **Line Connection Issues**
Poor line connections are a major source of AC interference in professional audio systems. It's essential to follow proper balanced/unbalanced signal transfer standards and avoid using low-quality connectors, which can introduce noise and degrade sound quality.
8. **Console Control Problems**
The console serves as the central control unit for the sound system. If the high, mid, and low EQ controls are equally adjusted up or down, it suggests that the system is not properly configured. Over-adjusting the EQ on the console can lead to an unnatural sound and should be avoided.
By understanding and addressing these common issues, audio engineers can improve the performance and reliability of their systems, ensuring a more enjoyable listening experience for the audience.