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PROFXV3+ MULTI-CHANNEL ANALOG MIXERS WITH ENHANCED FX, USB RECORDING MODES, AND BLUETOOTH®
Line / Hi-Z Switches [Chs. 1 and 2]
To connect a guitar or bass directly to the mixer without using a DI Box, press this switch in first; then connect the output
from the instrument to the channel's 1/4" TRS input. The input impedance is optimized for direct connection and high-frequency
fidelity is assured.
In the out position, the channel's 1/4" TRS input becomes a line input just like the other mono line inputs.
To use guitars or other instruments on other channels, you will need to use an external DI box first.
Without the DI box – or if this switch is not pressed in – guitars may sound dull and muddy.
Low Cut Switches
ProFX6v3+
ProFX10v3+
ProFX12v3+
All channels with a mic input have a low-cut switch (often referred to as a high-pass filter) that cuts bass frequencies
below 100 Hz at a rate of 18 dB per octave.
We recommend that you use low-cut on every microphone application except kick drum, bass guitar, or bassy synth patches.
These aside, there isn't much down there that you want to hear, and filtering it out makes the low stuff you do want much more
crisp and tasty. Not only that, but low-cut can help reduce the possibility of feedback in live situations, and it helps to conserve
amplifier power.
Another way to consider low-cut's function is that it actually adds flexibility during live performances.
With the addition of low-cut, you can safely use low equalization on vocals. Many times, bass shelving
EQ can really benefit voices. Trouble is, adding low EQ also boosts stage rumble, mic handling clunks
and breath pops from way-down low. Applying low-cut removes all those problems, so you can add
low EQ without blowing the woofers.
As seen in the pictures above, the ProFX6v3+ has two low cut switches, the ProFX10v3+ doubles
that number with four low cut switches, and the ProFX12v3+ has a whopping seven low cut switches.
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