Alesis DEQ230D User Manual download pdf (Page 59)

Applications 4

Comb filtering

You'll understand how this effect process got its name once you

see the way it looks when recreated on the DEQ230:

1. Follow the instructions for items 1 and 2 from Step 2.

2. Starting from the far left of Channel A, press every other

[BAND SELECT] button and take those bands all the way

down to -12 dB. Then select the unedited bands and boost

them +6 dB. When you’re done, look at the LEDs on the

DEQ230 and remember the “comb” analogy. The bands set to

+6 dB are the “teeth” of the comb, and those set to –12 dB

are the spaces between the teeth.

3. For an even more interesting effect, press the [LINK/EXIT]

button to unlink the bands on Channel B from Channel A and

create the exact opposite settings. In other words, take the

“odd” bands on Channel B to +6 dB this time and the “even”

bands to –12 dB. Be sure to toggle the [BYPASS] and

[LINK/EXIT] buttons to get an idea of what is being done

to the signal as it passes through the DEQ230.

4. Experiment with different sized "teeth" and "spaces." Put two

adjacent frequencies down and the next one up, repeating the

pattern. Try "broken" teeth (i.e., boosting some frequencies

more than others)! Adjust which frequencies to emphasize/de-

emphasize to suit the incoming audio.

ote: depending on the

incoming audio, it may be

necessary to reduce the gain

on some bands to prevent

clipping.

There are preset programs

similar to the ones used in

these examples. You may find

it interesting to compare the

results of the different settings

used in program 08 ("Comb

ilter - 125 Hz") and program

14 ("Telephone").

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Alesis DEQ230D User Manual Page 59