Ashly MQX-2310 Посібник з експлуатації - Сторінка 9

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Operating Manual - MQX-2310, MQX-1310, and MQX-2150 Graphic Equalizer

when this filter type is combined with a potentiometer to

adjust the equalization, the resistance of this pot affects

the "Q" of the filter so that a little equalization produces

a much broader curve than a lot of equalization.

The other filter approach is a true bandpass fil-

ter. This can be made with no inductors and more practi-

cal sized capacitors; the "Q" is easily set and remains

constant, and the parts count is reasonable. there are sev-

eral types of bandpass filters suitable for this job. Ashly

uses a "Q" enhanced Wein-bridge filter. Because it is a

symmetrical design using matched tuning components, the

"Q" is easily set and is very stable.

In designing a graphic equalizer, a selection of

filter sharpness must be made. More sharpness (higher

Q) produces less filter overlap and tighter control over an

individual band, but also causes ripple in the frequency

response when many filters are boost or cut together to

produce a flat response.

equalizer's primary use is for "voicing" and tone control,

and have set our filter sharpness to produce a maximum

of 1dB ripple.

The summing system in a graphic equalizer is

also important. Since there are a number of filters which

combine to produce the overall response, it is important

that the filters not interact (they WILL overlap, but the

response of one filter should not modify the response of

another). Ashly uses an "interleaved" summing system

where every other filter uses the same summing ampli-

fier so that adjacent filters never share the same drive

and feedback signals. This allows the filters to maintain

their natural response.

9. TROUBLESHOOTING TIPS

9.1 No Audio Output

Check AC power - is the pilot light on?

Check in/out connections - are they reversed?

Are you sure you have an input signal?

9.2 EQ Controls Do Nothing

Is the master EQ switch in?

The lowest and highest frequency sliders may be

beyond the range of the program material or speakers and

may produce little or no audible effect.

We feel that the graphic

9.3 Peak Light Flashes or Stays On All the Time

If the peak light flashes, the signal level to the

equalizer is too high. Turn down the gain. If it is on all

the time, disconnect the input and output cables. If it is

still on, the unit must be returned for service.

9.4 Distorted Sound

This will only be caused by too much signal

which will show on the Clip LED. If the LED is not

flashing, there is an overload somewhere else in the sig-

nal path. Adjust the relative gain of each component in

your chain to keep everything at a comfortable level.

9.5 Excessive Hum or Noise

Hum will usually be caused by a ground loop be-

tween components. Try using the suggested balanced in-

put and output hook-ups if the other pieces of equipment

used in conjunction with your equalizer have balanced

inputs and outputs.

Noise (excessive hiss) can be caused by insuffi-

cient drive signal. Make sure you are sending a nominal

0 dBu line level signal to the equalizer. Most noise prob-

lems occur because gain is applied to audio signals too

late in the chain. For best performance, apply gain to

individual source signals as early as possible, like at the

mixer input section. As gain increases, it also boosts the

noise content of that signal. Any cumulative noise built

up in a mixed signal will only be increased by using an

equalizer as a gain device, so make every attempt to op-

erate the equalizer with as little gain as possible.

Note: Unshielded cables, improperly wired con-

nections, and cable with broken strands (shorts, etc.) are

the most common problems. Make sure you use good

quality cable with connectors soldered firmly on the cor-

rect pin. When in doubt, get in touch with your Ashly

dealer, or call the Ashly service department at 800-828-

6308 ext.125.