Ashdown AA-50R Panduan Pengguna - Halaman 6

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AA-50R & AA-100R

LO-TRIM / HI-TRIM

The HI and LO trim controls have been provided to 'Trim' the sound from

the instrument / pick up combination to achieve a flat response prior to

any tailoring of the sound with the graphic or pull shape facilities. These

controls may also be used as EQ controls to adjust the top and bottom

end of the instrument sound. Do not boost the LO-TRIM excessively as

this will have the effect of increasing the chances of lowfrequency feed-

back.

CHANNEL 2

Channel 2, the LOW Z or LOW IMPEDANCE channel has two inputs,

one being a jack and the other a female XLR socket. These are both low

impedance, balanced inputs. A mono jack plug may be used in the jack

input for an unbalanced signal connection if required.

These inputs are for use with pickups that offer a low impedance,

balanced output. The jack input may also be used for a second ACTIVE

instrument if required. The XLR input is suitable for use with a micro-

phone for amplifying acoustic guitar, other acoustic instruments or vocals.

Phantom powering ( 48V ) is available with the switch next to the XLR. The

phantom power is ON when the switch is IN. Only use this if you have a

capacitor microphone that requires external phantom powering.

INPUT GAIN - SIGNAL LEVEL INDICATION

Set the INPUT GAIN control of channel 2 in the same way as for

CHANNEL 1.

USER GUIDE

AA-50R & AA-100R

GRAPHIC EQUALISATION

The five bands of graphic equalisation offered have their centre frequen-

cies chosen specifically to suit acoustic instruments and may be used to

adjust the overall sound of the amplifier. Avoid extreme settings on any

slider as these are unlikely to give useful results. Also avoid boosting the

100Hz slider too much as this will tend to increase the chances of low

frequency feedback.

DIGITAL EFFECTS

The 24 bit Digital effects board built into the Ashdown Acoustic amplifiers

uses a 16 way rotary PROGRAM switch.

NOTCH FILTER (ANTI FEEDBACK)

All models in the Ashdown Acoustic series include a NOTCH FILTER that

can be switched IN and OUT. This is included as an anti-feedback device

to allow amplification of an acoustic instrument (particularly acoustic gui-

tar) without trouble from feedback caused by the resonance of the body

of the instrument.

USER GUIDE