applications • chapter 4
Hum Removal
You may need to use a recorded performance with ground hum present on the track. This hum can be decreased or even eliminated using EQ:
•Band 1 set for narrow Q, cutting
•Band 2 set for narrow Q, cutting
•Band 3 set for narrow Q, cutting
You may want to enable the HPF on Band 1, centered around 60Hz, to completely eliminate the hum, depending on how much this effects the source. However, hum is usually present at several frequencies at once.
Tip: To find the exact frequency where hum is present, set the EQ band to a narrow Q, boost that band, then sweep the frequency control up and down until you hear the hum. When you’ve found the frequency, cut it as much as you can.
Tape hiss removal
If a recording has a lot of tape hiss, such as one transferred from cassette, you can usually get rid of it using a bit of high shelving EQ.
• Band 5 set to High Shelf, cut
Adjust the frequency and gain controls to compromise between keeping the high end of the recording and eliminating tape hiss.
Eliminating feedback
During a live performance, you may experience feedback if a monitor is reproducing a microphone placed too close to that monitor. However, this feedback often occurs at one frequency before it happens at others. You can "ring out" the monitor by using EQ to cut the frequency that’s feeding back. This is best to try when there is not a band and audience present:
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