18
age your amplifier and your speakers.
Ensure that the loudspeakers are correctly con-
nected (in phase), i.e. plus to plus and minus
to minus. Exchanging plus and minus causes
a total loss of bass reproduction. The plus pole
is indicated on most speakers. The impedance
load on each channel must not be less than
2 Ohms, otherwise the amplifier protection will
be activated. In addition the speaker outputs
are not bridgeable in any configuration.
Examples of speaker configurations can be
found on page 19.
5. Connection to power supply
Make sure to disconnect the battery before
installing the MATCH M 2FX!
Connect the +12 V power cable to the positive
terminal of the battery. The positive wire from
the battery to the amplifier power terminals
needs to have an inline fuse at a distance of less
than 12 inches (30 cm) from the battery. The
value of the fuse is calculated from the maxi-
mum total current draw of the whole car audio
system (M 2FX = max. 30 A RMS at 12 V power
supply). If your power wires are short (less than
1 m / 40”) then a wire gauge of 4 mm² / AWG 12
will be sufficient.
The ground cable (same gauge as the +12 V
wire) should be connected to a common ground
reference point (this is located where the neg-
ative terminal of the battery is grounded to the
metal body of the vehicle), or to a prepared met-
al location on the vehicle chassis, i.e. an area
which has been cleaned of all paint residues.
Attention:
For connection to power supply
solely use the pluggable screw-terminal which
is included in delivery (see page 16 fig. 2; Pow
-
er Input Plug).
6. Connecting the remote input
The remote input (
REM
) has to be connected
to the remote output of the signal source if the
signal source which is connected to the high-
level inputs is not activating the “automatic turn-
on” function or if the amplifier shall only be ac
-
tivated / deactivated by a remote signal applied
to the remote input.
We do not recommend controlling the remote
input via the ignition switch to avoid pop noise
during turn on/off.
Installation
Unique Features of the M 2FX
Class GD amplifier technology
Audiotec Fischers unique Class GD concept com-
bines the benefits of Class G technology with the
main principle of a Class D amplifier. The result is
an exceptional high efficiency that outperforms con
-
ventional Class D amplifiers. By varying the internal
supply voltage depending on the amplifier’s input
signals, idle losses are significantly reduced and
overall efficiency is close to maximum at any time.
So heat dissipation is almost negligible thus allow-
ing smallest heat sinks and most compact form fac-
tors for space saving and hidden installation con-
cepts, that were not previously possible.
Start-Stop capability
The switched power supply of the MATCH M 2FX
assures operation even if the battery’s voltage
drops down to 6 Volts during engine crank.
Smart highlevel input
The latest generation of OE car radios incorpo-
rates sophisticated possibilities of diagnosing the
connected speakers. If a common amplifier will be
hooked up failure messages and loss of specific
features (e.g. fader function) quite often appears -
but not with the M 2FX.
The new ADEP circuit (Advanced Diagnostics Error
Protection) avoids all these problems without load-
ing the speaker outputs of the OE radio during high
volumes unnecessarily.
