Low Cut - RME Audio ADI-96 PRO User Manual

9.2 Low Cut

Function
Hi-pass with adjustable corner frequency between 2 Hz and 250 Hz at 12 dB/oct.
Application
Removes low frequency noise in microphone recordings, rumble and flutter when converting
older analog material, hum in speech recordings.
Settings
In the Overview window place the cursor on LOC and press Enter.
Menu
Options
The begin of the bass suppression (corner frequency) is adjustable in each channel from 2 Hz
to 250 Hz.
Typical Settings
In mixing desks values around 120 Hz are usual. As the filter has a smooth roll-off 50 Hz hum
will be noticeably reduced with this setting, but the harmonics at 100 Hz and above won't.
That's why the filter can work up to 250 Hz. In extreme situations such a setting is able to res-
cue a speech recording.
Noise and the low frequency pops of microphones do not require such an extreme cutoff at
lower frequencies. Recommended values are 50 to 80 Hz.
Low frequency rumble as of turntables (or other signals which lead to slowly pumping loud-
speakers) are already suppressed with a setting of 30 Hz, which results in no audible bass re-
duction. When mastering often all frequencies below 30 Hz are lowered. Several electronic
sound sources, especially Synthesizers and Keyboards, generate high amounts of inaudible low
frequency junk, which stresses power amps and loudspeakers, but has no effect on the feelable
and audible bass bottom.
User's Guide ADI-96 PRO © RME
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