Alesis CLX440 Specifications download pdf (Page 34)

applications • chapter 4

34 PEQ-450 Reference Manual

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 –18dB at 60Hz

• Band 2 set for narrow Q, cutting –18dB at 120Hz

• Band 3 set for narrow Q, cutting –18dB at 180Hz

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 –6dB at 8kHz

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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Alesis CLX440 Specifications Page 34