AC Guitars EQ-02 사용 설명서 - 페이지 3

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FILTER-BASED EQ-02 SYSTEM

INSTRUCTION MANUAL

VOLUME/BLEND STACK

The volume of the instrument is controlled by the upper ring on the stack while the lower ring controls the

mixing of the outputs from the two pickups. Turn ACW for the bridge pickup alone and CW for the neck

pickup. Intermediate settings allow a mix of the two pickups. The indented centre click gives an equal mix. In

several configurations the volume and blend are on individual pots.

The main elements in the pre-amp are the filter stacks.

BASS FILTER STACK

First, a filter lets some parts of the frequency spectrum through and not others. The type of filter determines

which part it lets through. Also, the amount of cut-off is important. If it has a sharp or steep cut-off, it is more

dramatic.

There is a LOW PASS FILTER where the frequency is variable over quite a broad range; from just allowing

the very deepest sounds through, to allowing upper midrange frequencies of 6.3 kHz. As the frequency

control is adjusted, sound ranges from very deep to a much more open sound, taking in more midrange as

the control is increased.

As it's a low pass filter, the very low bass is always there, but the high frequencies can be progressively

opened up.

This aspect of the pre-amp is controlled by the lower ring on the filter stack. Fully ACW giving you a very full

deep bass sound. As the knob is turned CW, more of the higher frequencies are let through the filter.

The upper knob of the filter stack controls the overshoot peak. This means that some resonance can be

added at the frequency of cut-off to which the filter is tuned. This has the effect of making the sound much

richer at the point of the filter frequency. So if the filter is set to a low frequency on the neck pickup, and the

overshoot peak is increased, you get a massive reggae style of sound as you're giving resonation to the

more fundamental frequencies. If the filter is set higher, it accentuates the harmonics. To give you an idea, if

you rotate the filter control up and down when the peak is turned up, it sounds very much like a wah control.

The upper ring on the filter stack sets the peak level. Fully CW is maximum gain (boost) and when turned

ACW the gain is reduced.

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