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Notch Filter
This represents a fixed-depth dip or notch in frequency response which can be moved across
the sound spectrum with the FREQuency control to either attenuate feedback or enhance the
sound of your particular instrument. If feedback occurs, make sure that the NOTCH button is
depressed, then rotate the FREQuency control slowly until the feedback is reduced or elimi-
nated. Please note that if feedback occurs when you are in close proximity to the AM150, the
notch filter may not be able to stop all of it. Either reduce volume, reduce the LOW, MID or
HIGH EQ control setting or move the guitar farther away from amplifier to defeat the feedback.
CLIP LED
This feature can be used to gauge input level to avoid audible clipping. If it begins flashing you
have turned up the GAIN, one or more of the EQ controls and/or the instrument to the point where
the amplifier is running out of power headroom. Do not turn up further or distortion can occur.
Channel 2 (General Purpose)
Inputs
This channel's ¼-inch INPUT jack accepts line level signals, e.g. from a **CD player, a tape
deck or a mixer. Alternatively it can accept any guitar with active pickups (i.e. with a built-in
preamp), or any keyboard instrument. It is balanced Tip(+), Ring(-), Sleeve, however it also
accepts unbalanced cables. For best results and to reduce noise, it is advised that you use
balanced cables wherever possible. The 3-pin XLR INPUT connector accepts any low-
impedance dynamic microphone. Alternatively it can be used as a balanced line-level input,
perhaps from a mixer's monitor or auxiliary output.
**To connect a stereo source to the ¼-inch input of Channel 2's input, use an appropriate adapter
which terminates in a male ¼-inch stereo plug (e.g. dual female RCA to ¼-inch male stereo).
Do not use both the ¼-inch and XLR inputs on Channel 2 at the same time, signals will be
highly attenuated!!
EFX Loop - General
Channel 2 can be sent to the AM150's internal digital effects system via the EFFECTS
Defeat /Active pushbutton (active in the down position). However this channel can also be
connected to an external effects unit and/or a graphic equalizer (Channel 2 is not affected by
Channel 1's EQ or Notch filter haence some equalization may be desired for certain instru-
ments or other signal sources). Internal effects and loop-connected effects, EQ, etc. can be
run at the same time on this channel (only).
EFX SEND
This unbalanced ¼-inch output is located on the back panel. Connect it to the input of the
external effects unit or EQ with a standard unbalanced shielded patch cable.
EFX RETURN
This unbalanced ¼-inch input is also located on the back panel. Connect it to the output of
the external effects unit or EQ with a standard unbalanced shielded patch cable.
EFFECTS MASTER Control (dry/wet) and EFX. FOOTSWITCH jack:
The control increases or decreases the intensity of internal effects (note, it does not regu-
late the intensity of any external effects which might be connected to channel 2). An
optional footswitch plugged into the EFX FOOTSWITCH jack on the back panel may be
used to activate or bypass the internal effects (only).
2
All manuals and user guides at all-guides.com
Tips
• If the line out is used to inject a signal into a mixer and no output power is desired from the
AM150 speakers, set the master control to "0" and increase or decrease the gain control on
either or both of the channels.
• Clip LED on Channel 1: The clip LED will illuminate if the input gain and/or the signal at the
EQ section is too hot. This will drive the amp to clipping. Adjust the Volume control or EQ con-
trols on channel 1 accordingly.
• Clip LED on Channel 2: The clip LED will illuminate if the input gain is high enough to clip
the amplifier output. Adjust the Volume control on channel 2 accordingly.
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