The Acoustic Master 100; Power; Tone Controls (Ch1); Notch Filter Control - YORKVILLE Acoustic Master AM100 Owner's Manual

The Acoustic Master 100

Your Yorkville AM100 is a 100-watt stereo acoustic guitar amplifier designed to reproduce sound
from an acoustic guitar as realistically as possible. The compact size and light weight of the
AM100 make it easy to transport to use almost anywhere. The amplifier accepts the output from
active or passive pickups of your acoustic guitar, a microphone, or even line-level signals. Other
features include 32-preset digital effects, master volume control, a balanced line out, Channel 2
effects loop, Channel 2 effects enable/disable switch, wet/dry master effects control, and a sweep-
able notch filter. The versatility and response of the AM100 will make it a pleasure to play for
years to come. An optional footswitch can be used to change the digital effects presets.
The Yorkville AM100 has 2 input channels, both of which can be used simultaneously.
For example, an acoustic guitar can be used on Channel 1 while a microphone, a keyboard,
or even another acoustic guitar (using an active pick-up) can be in use on Channel 2.

Power

The green LED located under the power switch will illuminate when the unit is turned on.
Channel 1
The input to Channel 1 is unbalanced with an input impedance of 1Meg-Ohm, and can
accept either passive or active pick-ups (piezo/coil). Controls include volume, low, mid and
high equalization, as well as a sweepable notch filter. This filter eliminates most feedback
generated by the guitar and/or amplifier, and can also be used to help shape the amplifier's
response to the user's taste. The notch filter can be switched on or off. The clip LED can be
used to gauge input level to avoid audible clipping.

Tone Controls (CH1)

The Channel 1 tone controls help you access the wide range of sonic possibilities of the
AM100 (these controls DO NOT affect Channel 2). Rotate the Low control to affect low fre-
quency bass information, the MID control to affect mid frequencies, and the HIGH control to
affect the higher frequencies.

Notch Filter Control

The sweepable notch filter control is located in the Channel 1 block and is used to eliminate
feedback that is caused by the guitar being too close to the amp at higher power. When
feedback does occur, make sure that the notch filter switch is pushed in, then rotate the
notch control slowly until the feedback is eliminated. Please note that if feedback noise
occurs when you are in close proximity to the guitar amp, the notch filter may not help.
Therefore either reduce power or move the guitar farther away from amplifier.
Channel 2
This channel accepts line level signals, a microphone (XLR), or any instrument with an active
pickup with it's own volume control. Channel 2's ¼-inch input is ideal for a CD player, tape
deck, keyboard or other audio sources. Both channel inputs are balanced (TRS or
Tip/Ring/Sleeve, +/-/gnd). The ¼-inch phone jacks also accept regular unbalanced cables.
For best results and to reduce noise, it is advised that you use balanced (stereo) cables for
interconnection wherever possible.
* To connect a stereo source to the ¼-inch input of Channel 2's input, use an appropriate adapter which termi-
nates in a male ¼-inch stereo plug (eg dual female RCA to ¼-inch male stereo).
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