Laney A1+, Руководство пользователя, Страница: 5 / 16

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Active Treble control allowing boost or cut of the high frequency response of the pre-amplifier.
Anti-Feedback control can be switched in and out here and adjusted with (10) to eliminate the "body
resonance" feedback often associated with amplified acoustic guitars at high volume levels.
To eliminate "body resonance" feedback, switch the filter in with (9) and adjust this control until the body
resonation reduces; you should find a “sweet spot on” the control where it disappears. Turning further out of
the sweet spot will bring the resonation back up again. This setting will be the optimum for that particular
guitar but may need to be altered if you plug in another guitar.
Switches the phase of the signal from the amplifier. When you play any acoustic guitar the sound it produces is
a waveform, the same applies to an acoustic guitar plugged into an acoustic amplifier. It is not uncommon for
these two waveforms - which occur simultaneously, to be out of phase with each other. To a player who is sat
close to an amplifier this poses a small problem if the wave forms are out of phase as they are destructive to
each other and cancel each other out. This would cause the guitar to sound a little thin and lack-lustre.
Engaging the phase switch switches the phase of the amplified signal removing the problem of destructive
interference. However sometimes the low frequencies being in phase can cause acoustic feed back problems,
to avoid this try operating the phase reversal switch. Most times this will cure the problem.One thing to point
out is that the audience does not hear any phase problems as by the time the sound wave reaches them any
phase differences have been cancelled out naturally.
Mutes the amplifier. LED is flashing when muted.
Sets the overall listening volume of the amplifier.
Effects Control Set: See pages 8-9 for detail of their operation.
A 3.5mm Stereo line input for connection of a CD/MP3 player as a backing track. Control the level of the
input using the Level control (20).
Socket for connecting a pair of quality headphones. When in use, the internal loudspeaker is automatically
muted.
Lights when Phantom Power has been applied to Channel 2. (See rear panel controls).
When illuminated indicates that power is connected to the unit and it is ready to go.
(ALWAYS SWITCH OFF AND DISCONNECT THE POWER CORD WHEN NOT IN USE)
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