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FX 20
77
FX 20
PLANAR WAVEGUIDE SUB
To generate the maximum
possible sound pressure, the FX 20
subwoofer features a Planar
Waveguide bass horn and a high-
power EVX 180B 18“ woofer.
It covers a bandwidth from 30 Hz
to 150 Hz with a maximum sound
pressure level of 132 dB / 1 m.
Two of these Planar Waveguide
subwoofers deliver up to 138 dB /
1 m per side, creating an extremely
dry and deep bass foundation for
Xa 2 systems. Like the top, the
18“ woofer is securely protected
against thermal overload by the
Voice Coil Tracking Protection
system, and even extremely high
power peaks are transduced
accurately and powerfully without
compromising the dynamic range.
The cabinet is made from multiply
poplar plywood 15 mm thick cove-
red by extremely hard-wearing
needle-felt carpeting. Two FX 20
subwoofers stacked one on top
of the other reach a height of 180
cm, creating the ideal plinth for
an‚ overhead‘ stack of FX 12 tops.
Again, the use of four-pole Speakon cables obviates the risk of wiring
errors when connecting up the
system. The Sub signal supplied by
the system power amplifier is on
Pin 1+ / 1-, and the midrange / high
frequency signal on pin 2+ / 2- is
looped through to the tops.
Four large rubber feet on the side
and the same number on the bottom
provide for safe stacking in a variety
of configurations. No fewer than
six handles and four heavy-duty
castors on the rear facilitate safe
transportation.
SYSTEM AMP
XA 4000
The Xa 4000 system amp is a two-way
(Sub-Top) power amplifier that can
either be positioned laterally – for
shorter cable runs to the cabinets – or
centrally in the rack. Only two rack
units in height and weighing a mere
8.25 kg, this Class H power amplifier
is equipped with a switch-mode power
supply of the latest generation. It out-
puts 1,100 W in the Sub and 900 W
in the Top channel – in each case into
4 Ω. Up to three tops and three sub-
woofers, however, can be driven reliably
and economically by a single amp. All
the requisite signal processing including
the equalization, LPN filter, low-cut filter
and active crossover, with its crossover
frequency of 140 Hz with 18 dB / octave
in a modified Butterworth structure, is
on board. From the front panel, the level
of the Sub and Top channels can be set
individually to allow optimization of the
system to the geometry and acoustics of
the room.
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