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CLASS D WIRING CONFIGURATIONS
WIRING USING (1) TERMINAL
The Class D amplifiers are single channel amplifiers. Unlike Crossfire Class A/B amplifiers, these operate as single channel,
therefore one amplifier cannot be bridged by itself. Do not confuse the pair of speaker outputs as left and right. The two outputs
provided are strictly for convenience and are paralleled internally on the circuit board of the amplifier. This means that if both
outputs are used with one subwoofer each, the amplifier sees the same ohm load as if the same two subwoofers were connected
to only one output terminal. Please see diagrams below.
+
+
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Each subwoofer has a single 2
ohm voice coil and are connected
in parallel to one terminal, the am-
plifier will see a 1 ohm.
WIRING USING (2) TERMINALS
Each subwoofer has a single 2
ohm voice coil and each subwoofer
is connected to each terminal, yet
the amplifier sees 1 ohm.
CROSSOVER
On the side panel of your amplifier is a potentiometer marked 50Hz-250Hz. This controls the relative crossover point for the
amplifier. To apply the crossover feature, locate the switch on the same side panel that’s labeled HPF/FULL/LPF. For highpass
applications, such as componet sets or coaxials, choose HPF. For lowpass applications, such as woofers, choose LPF. If yor are
looking for full range application, place switch on FULL. Note that full will override the crossover completly
Listed below are recommended crossover points for various size speakers. These are only guidelines. Actual crossover points
recommended by the speaker manufacturers may vary and we suggest you follow those recomendations.
Speaker size Crossover recommendation:
4” (100mm) Component/ coaxial
HPF 130Hz - 150Hz
5.25 (130mm) Component/ coaxial HPF 80Hz - 110Hz
6’ (160mm) Component/ coaxial
HPF 70Hz - 100Hz
8” (200mm) woofer
LPF 90Hz - 120Hz
10” (250mm) subwoofer
LPF 70Hz - 100Hz
12” (300mm) subwoofer
LPF 70Hz - 100Hz
15” (380mm) subwoofer
LPF 50Hz - 80Hz
BOOST: (Class A/B Models Only)
If your system is lacking low bass response locate the boost switch
next to the crossover. By placing this switch in the “ON” position,
0-6dB of boost centered around 45Hz will be added. In the “OFF”
position no boost is added to the output signal. This boost swtich is
available on specific models only. Please see specification chart for
verification. Crossfire highly recommends using this feature only on
amplifiers powering subwoofers.
PREAMP FEATURES
