Yamaha YDG2030 Using the notch lters, and the HPF and LPF

16 – TUTORIAL – Using the notch filters, and the HPF and LPF

YDG2030

One method of “tuning” a room (compensating for dead and live frequencies) with a con-

ventional graphic equalizer is to move the faders up and down one at a time while putting

white noise through the sound system. Then, if “ringing” is heard at any particular fre-

quency, you can reduce the gain of that frequency. Likewise, if a particular frequency seems

to get lost, you can increase its gain. This process is simpliﬁed greatly with the YDG2030, as

a preset gain or cut can be swept through the entire frequency range using the F rotary

encoder.

1Enter the sweep screen (see step 1 in the example

above).

2If you wish to alter both channels simultaneously, link

the channels (see step 2 in the example above).

3To search for particularly “live” spots, turn the G rotary

encoder to increase the gain by a few dB (experiment to

ﬁnd the best amount). When this gain is swept, it will

be added to the existing gains at each frequency.

4While feeding an appropriate signal through the sound

system (pink or white noise is best, if possible), use the

F rotary encoder to sweep the frequency gain you cre-

ated through the entire frequency band, listening for

points that start to ring/feed back. If no ringing occurs,

try increasing the gain setting until it does.

5Once you know the feedback frequencies, press the

[DISPLAY] key four times to return to the main graphic

equalizer screen, and reduce the gains of those frequen-

cies.

Steps 3, 4 and 5 can be repeated as many times as necessary.

Using the notch ﬁlters, and the HPF and LPF

Besides the HPF and LPF, which are shelving high-pass and low-pass ﬁlters, respectively,

the notch ﬁlters provide very selective gain cuts, with adjustable Q. One of their main uses is

to ﬁlter out sounds that occur at speciﬁc frequencies, such as 50/60 Hz AC hum, or the high

frequency noise induced by some ﬂuorescent lighting, or lighting dimmers. Of course, to

avoid affecting the original material any more than necessary, try to use the narrowest notch

possible that will remove the offending signals.

Q is a measure of the resonance of the ﬁlter. Basically, the higher the Q, the narrower the

notch. Except for setting the Q, the process for setting the notch ﬁlters and the HPF and LPF

is exactly the same (the shelving HPF and LPF don’t have Q).

1If you are in any screen other than the two ﬁlter screens,

simply press the notch or ﬁlter indicator corresponding

to the notch or ﬁlter you wish to toggle on/off.

2If you are in one of the two ﬁlter screens, ﬁrst ensure the

notch or ﬁlter is selected for editing (you may need to

press the corresponding selector once to do this), then

press the appropriate selector to toggle it on/off.