Ashdown Ashdown Acoustic Series 사용자 설명서 - 페이지 5
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AA-50R & AA-100R
INSTRUMENT INPUTS
Channel 1 is the HIGH Z or HIGH IMPEDANCE channel and will be the
one most commonly used for plugging your instrument pick up or trans-
ducer into. Two inputs have been provided on this channel to cope with
the wide variety of different types of acoustic instrument pick ups and the
equally wide variation in signal level from different pick up and instru-
ment combinations.
PIEZO / LO-LEVEL
The first of these is the PIEZO / LO-LEVEL input. This input is designed to
suit any kind of pick up that does not have its own built in preamp. This
includes piezo transducers and wound pick ups that are either built into
the instrument or attached to it in some way.
The input has an extremely high input impedance that is essential for pie-
zo pick ups to allow them to reproduce a rich and full sound, into a lower
impedance they can sound thin and tinny. This very high impedance input
also gives excellent results with wound or other types of passive
transducer. This input is far more sensitive than the ACTIVE input and may
also be used where you have an active instruments that has a low level
output signal.
ACTIVE / HI-LEVEL
The second input is the ACTIVE / HI-LEVEL input. This input should be
used with instruments that have inbuilt electronics with a large signal
output as these could overload the input stage of the PIEZO / LO-LEVEL
input.
AA-50R & AA-100R
USER GUIDE
INPUT GAIN CONTROL - SIGNAL LEVEL INDICATION
It is very important to set the INPUT GAIN control correctly in order to
provide the amplifier with the optimum level of signal. This control is a
volume control for the channel, it is to enable you to set the correct input
level to the channel. If this control is set too low you may experience
excessive background noise and inadequate effects level.
This control is set in conjunction with the SIGNAL LEVEL LED. To set this
control correctly use the following procedure:-
1. Plug the instrument into the appropriate input depending on your type of instru-
ment or pick up.
2. Set the graphic to flat ( all sliders in the center ), the LO-TRIM and HI-TRIM their
center positions and the MASTER LEVEL to zero.
3. Play the instrument in the way you wish to use it ( i.e. strumming, finger picking
etc).
4. Increase the INPUT GAIN control until the SIGNAL LEVEL LED lights up BRIGHT
GREEN for most of the time while playing and changes to RED on peaks or heavy
playing.
5. If the LED cannot be made to register RED while using the ACTIVE / HI-LEVEL
input then transfer your input to the PIEZO / LO-LEVEL input and re-adjust the INPUT
GAIN as from step 3.
IMPORTANT! When correctly set, the GREEN LED should light for most of the time
while playing and change to RED only on peaks.
USER GUIDE