Duncan A E C Panduan Pemilik - Halaman 5

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Setting Up for Optimal Performance

A simple step-by-step procedure is outlined below for setting up the amplifier for optimal

performance.

1. Reset Controls -Turn down the volume, set the Bass and Treble flat, and turn notch

Depth control all the way counter clockwise (no cut).

2. Set Tone - Turn the Volume up to a low listening level and set the Bass and Treble to

taste.

3. Eliminate Feedback - Mute the strings with your right hand by the bridge. Turn up the

instrument volume until the guitar almost, but not quite, breaks into feedback. Now tap

the soundboard with your finger on your right hand while continuing to mute the strings,

and you should hear a "ping". Set the notch-filter Depth control at 12:00. Now slowly

rotate the notch Frequency control from about 12:00 to 5:00. At some point the "ping"

should disappear and you'll just hear a dull "thunk" every time you tap the top. Now the

notch filter is tuned to the soundboard resonance of your guitar. Another technique is to

let the guitar actually feedback (if you can stand it) while dialing in the frequency. The

feedback will stop when you've got it tuned correctly. If you use this method, set the

Depth control to 2 o'clock help make the notch obvious. Now bring the master volume up

to playing volume. If you get a low rumble or roar when you try to turn up, push the

phase button to cancel the air cavity resonance. The correct phase depends on the

position and direction of the instrument, relative to the amplifier; so make sure you check

the phase in the location where you'll actually be playing. You'll also find that the louder

you turn up, the deeper you'll have to notch out the sound board resonance using the

depth control.

Even though these instructions are simple, it takes a little practice to get the hang of

setting up quickly. After a few times through the process you'll be amazed at how easy it

is to get a great sound.