Monitor Speakers

Monitor speakers are used to achieve high quality sounding mixers.

active-monitor-speakers
Figure 1 - Active monitor speakers

Loud Speaker System

Loudspeakers are essential for converting electrical energy from an amplifier into sound. Here's how they work:

  • Electric Signal: An alternating current flows into a coil of wire within a magnetic field.
  • Movement: This current creates a changing magnetic field that moves the cone forward and backward.
  • Sound Production: The cone's movement generates sound waves, with the frequency of the signal determining how fast the cone moves.

A 1000 Hz signal makes the cone move 1000 times per second.

Frequency Range and Drivers

A full-range loudspeaker system typically covers a frequency range of 20 Hz to 20 kHz—the range of human hearing. However, achieving clear sound across this wide range requires multiple specialized drivers:

  • Bass Driver (Subwoofer): Reproduces low frequencies (20 Hz to 250 Hz).
  • Mid-Range Driver (Squawker): Handles mid-range frequencies (250 Hz to 4000 Hz).
  • Tweeter: Reproduces high frequencies (above 5000 Hz), crucial for clear, sharp sound in high-frequency ranges.

A crossover network divides the audio signal into these frequency ranges and sends each range to the appropriate driver.

Active vs. Passive Monitors

Loudspeakers come in two types: active and passive.

  • Passive Monitors: Require an external amplifier to function. These are less common in modern setups.
  • Active Monitors: Include a built-in amplifier, making them easier to set up and more popular in professional studios. They deliver optimized performance without needing external amplification.

Monitor Setup and Positioning Tips

Proper setup and placement of your monitors significantly affect the quality of sound. Here’s how to achieve the best sound:

  • Monitor Placement: Position the speakers forming an equilateral triangle with your listening position. This ensures a balanced stereo field.
  • Tweeter Height: Place tweeters at or slightly above ear level to achieve the best clarity.
  • Room Positioning: Keep speakers away from walls and corners to avoid unwanted resonance and bass distortion.
  • Balance: Ensure both monitors are at the same volume level for an accurate mix.

Types of Monitors

  • Near-Field Monitors: Ideal for home studios, near-field monitors are placed close to the listener, typically between 1-2 meters away. They offer a direct sound with minimal room interference.
  • Two-Way Speakers: Common in studios, these speakers have a bass driver and tweeter. For optimal performance, choose drivers with at least an 8-inch diameter and a power rating of around 90W.

Polarity and Phase Issues

Incorrect wiring can cause phase problems:

  • In-Phase Monitors: Both speakers move in sync, creating a cohesive sound image.
  • Out-of-Phase Monitors: One speaker moves in the opposite direction, causing a "thin" or "hollow" sound.

Make sure all speakers are in phase by checking the wiring before mixing.

Managing Sound Levels

When mixing, adjusting the volume is crucial:

  • Higher Volume: Helps accentuate bass frequencies.
  • Moderate Volume: Useful for checking overall balance and preventing ear fatigue.
  • Breaks: Avoid long sessions at high volumes. Take short breaks every hour to prevent ear fatigue, which can make high frequencies seem dull.

Monitoring in Different Environments

Using multiple reference points is key to a great mix. Listen to your track on various systems, such as:

  • Hi-Fi System: Check how it sounds on a stereo system.
  • Car Stereo: Often reveals how a mix translates to everyday listening environments.
  • Headphones and Spectral Analyzers: Use tools like a spectral analyzer to visualize and adjust frequency balance.

Conclusion

Choosing the right loudspeakers and setting them up properly is crucial for accurate sound reproduction. Understanding the differences between monitor types, speaker placement, and phase issues can significantly improve your mixing process. Always refer to multiple listening environments and use tools like spectral analyzers to ensure a balanced and professional mix.