On an Allen & Heath Qu, start vocal compression at 3:1, 10 ms attack, 50 ms release, and +4 dB makeup gain. During full-band rehearsal, lower the threshold until loud peaks show roughly 6 dB of gain reduction. If S sounds become sharp or the vocal feels lifeless, ease back.
Most church vocals do not sound bad, they just need more control.
They disappear during a quiet line, then turn harsh when the singer really leans in. You may have the EQ in a good place and still feel like the vocal never settles into the mix.
That is usually a compression issue.
Vocals naturally move between quiet and loud, and compression narrows that range so the vocal stays consistent with the band without losing its energy. Used well, it controls the loud moments that can make people cringe and helps keep quieter moments from getting buried.
There is a narrow window where compression helps. Too little, and the vocal still jumps around. Too much, and it becomes small, flat, unnatural, and lifeless.
The goal is control without taking the life out of the singer.
Compression works best after you have applied a simple vocal EQ strategy.
EQ and compression solve different problems. EQ shapes the tone of the vocal; compression manages its changing level.
Do not expect the compressor to fix a vocal that still needs foundational EQ work.
Select the vocal channel on your Allen & Heath Qu and turn the channel compressor on. Start with these settings:
These are your starting settings, not a reason to keep changing every control for every vocalist. Once these are in place, the main setting you need to adjust for each singer is the threshold.
The threshold determines when the compressor begins controlling the vocal. This is where you make sure there is enough compression to manage the peaks, but not so much that you squash the life out of the performance.
Set the threshold while the vocalist is really singing out during rehearsal with the full band playing. Do not set it while they are singing alone.
A vocalist will not usually sing the same way solo as they do when the band is behind them, especially during the biggest moments of a song. You need to hear and measure the vocal in the environment where it will actually be mixed.
Watch the compressor’s gain-reduction meter as they sing. Adjust the threshold until you see about -6 dB of gain reduction on their loudest moments.
During softer phrases, the gain-reduction meter may not show any compression at all. That is okay.
The compressor does not need to work constantly. Its job here is to catch and control the moments that would otherwise jump out, get harsh, or overpower the rest of the mix.
About -6 dB of reduction on peaks is a dependable target, but there is some wiggle room. If a vocalist needs more control, you can use a little more compression.
Just recognize that there is a fine line before the vocal begins to sound dead and lifeless.
Do not judge this only by the meter. Listen to what the compression is doing in the full-band mix.
A properly compressed vocal should feel steadier: loud moments should stop poking out painfully, and quieter moments should stay more usable in the mix. It should not sound obviously crushed or stripped of its natural energy.
One clear indicator of overcompression is overly sharp S sounds. Compare the vocal with compression on and off.
If the S sounds are sharp with compression engaged but do not sound sharp without it, ease the threshold back so the compressor is doing less work.
This is why it is important not to chase more and more gain reduction just because the meter allows it. More compression can bring the vocal under control, but past the useful range, it makes the tone and articulation less natural.
You can use the same basic compression technique on instruments too, with slight variations for the source.
Start with sensible settings, listen with the full band, watch the gain-reduction meter during the loudest playing, and use only enough compression to control peaks without taking the life out of the instrument.
The principle does not change: compression is there to make the mix feel controlled and consistent, not to make every source flat. Set it in context, use the meter as a guide, and let your ears tell you when the sound has crossed the line from controlled to lifeless.
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