PHONIC HELIX BOARD 12 FIRE WIRE MKII
Owner's Manual

22. Middle Frequency Control
This control is used to provide a peaking style of boost and cut to the level of middle frequency sounds at a range of �15 dB. These mixers also provide a sweep control, allowing you to select a center frequency between 100 Hz and 8 kHz. Changing middle frequencies of an audio feed can be rather difficult when used in a professional audio mix, as it is usually more desirable to cut middle frequency sounds rather than boost them, soothing
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26. Pan / Balance Controls

This alternates the degree or level of audio that the left and right side of the main mix should receive. On mono channels, the PAN control will adjust the level that the left and right should receive (pan), where as on a stereo channel, adjusting the BAL control will attenuate the left or right audio signals accordingly (balance).

27. On Button and Indicator

This turns the channel on, allowing the user to use the feed from the channel�s inputs to supply the MAIN L/R, GROUP 1/2, AUX and EFX buses. The corresponding indicator will be illuminated when turned on.

28. 1-2 and L-R Buttons
These handy buttons allow you to decide the audio path of the corresponding channel. Pushing the �1/2� button allows the signal to be sent to the Group 1/2 mix, where the �L-R� allows it to be sent to the Main L/R mix.

overly harsh vocal and instrument sounds in the audio. Stereo channels 11/12 and 13/14 of the Helix Board 18 FireWire feature a High-Mid and Low-Mid control instead of the typical controls described above. They provide a peaking style of boost and cut to middle frequencies, where the frequencies are set at 3 kHz and 800 Hz (High-Mid is set at 3 kHz and Low-Mid is set at 800 Hz). Stereo channels 9/10 and 11/12 have a single Middle Frequency control, with the center frequency set at 2.5 KHz.

29. Peak Indicator
This LED indicator will illuminate when the channel hits high peaks, 6 dB before overload occurs. It is best to adjust the channel level control so as to allow the PEAK indicator to light up on regular 31 intervals only. This will ensure a greater dynamic range of audio. This indicator also doubles as a Solo indicator, when the SOLO button is engaged.
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23. Low Frequency Control

This control is used to give a shelving boost or cut of �15 dB to low frequency (80 Hz) sounds. This will adjust the amount of bass included in the audio of the channel, and bring more warmth and punch to drums and bass guitars.

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24. AUX Control

This control alters the signal level that is being sent to the auxiliary 1 mixing bus, the signal of which is suitable for connecting stage monitors, allowing artists to listen to the music that is being played. Also included is a Pre/Post button, which alternates the feed to the AUX 2 mixing bus between a post and prefader feed.

30. Solo Button

The Solo button is pushed to allow the signal of a corresponding channel to be sent to the Control Room / Phones control (pre or post fader, depending on the properties selected by the pre / post button, located by the Control Room / Phones control), for use with either headphones or studio monitors. This also allows easier setting of the input gain and tracking of audio by sound engineers. The Peak indicator above the Solo button also doubles as a Peak Indicator, illuminating when the signal reaches high peaks.

25. EFX Control

This control alters the signal level that is sent to the EFX send (AUX 3) output and the built-in digital effect processor. The EFX send signal can be used in conjunction with external signal processors (this signal of which can be returned to mixer via the AUX return input), or simply as an additional auxiliary output.

31. Channel Level Control (Fader)

This control will alter the signal level that is sent from the corresponding channel to the appropriate mixing buses (whether they are the MAIN L/R or AUX).

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Helix Board 18 FireWire User's Manual

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