PMC AML2, User Manual

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The AML2’s operational controls are hidden under a magnetically-latched flap towards the rear
of the top panel. After opening the flap the input sensitivity can be adjusted as necessary with
the rotary control on the extreme left-hand side.
Room correction equalisation (EQ) and tonal adjustment is provided by the three rotary controls
to the right-hand side. These controls must be activated by pressing the EQ IN button – an
associated LED changes illumination from green to red when the EQ controls are functioning.
The LF Roll-off control determines the point at which the low frequencies start to become
attenuated. The default position is ‘0’ and permits the full bass extension of the AML2. The three
alternative settings offer higher roll-off frequencies and are intended to compensate for the
inherent increase in LF energy which occurs when the speakers are placed close to walls, or near
corners. Choose the setting which provides the most natural and uniform bass response.
The HF and LF Tilt controls allow the tonal balance of the AML2 to be adjusted to suit personal
preferences and the acoustics of the listening environment. In a heavily treated room, for
example, it might be necessary to boost the high frequencies to compensate for the absence
of high frequency reflections, whereas in a room with lots of reflective surfaces it might be
preferable to reduce the high frequencies slightly. Similarly, the positioning of the speakers in the
room will affect the bass response, and although it is always better to tune the system response
by adjusting speaker placement, the LF tilt control affords some additional tonal adjustment
which may be helpful. The ‘0’ settings for the two Tilt controls provide a flat response and these
are the default settings.
Operational Controls