Crossfire VR401 - Preamp Features; Crossover Settings

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SPECIFICATIONS
IMPORTANT
Please read all instructions before installation!
MOUNTING
Tab Installation Input Sensitivity
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LOW IN
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50Hz 150Hz
HIGH IN
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WIRING DIAGRAMS CONTINUED
PREAMP FEATURES
PREAMP FEATURES
The VR401, VR300D, VR600D, VR1000D and VR2000D are single channel amplifiers. Unlike most Crossfire amplifiers,
these operate as single channel, therefore one amplifier cannot be bridged by itself. Do not be fooled by the two sets
of speaker outputs. Two outputs are provided striclty for convenience and are paralleled internally on the circuit board of
the amplifier. This means that if both outputs are used with one driver each, the amplifier sees the same load as if the
same two drivers are connected to only one output terminal.
CROSSOVER
On the side panel of your amplifier is a potentiometer marked 50Hz-150Hz or on some models it is 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 reads HPF/Full/LPF. For highpass applications, such as component sets or coaxials, choose HPF. For
lowpass applications, such as subwoofers, choose LPF. If you are looking for a full range application, place the switch on
FULL. Note that full will override the crossover completely.
Note: All four channel amplifiers have two sets of crossover controls, one for the front channels and one for the rear
channels.
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
If your system is lacking low bass response, locate the boost switch next to the crossover. By placing this switch in the
"ON" position, 6dB of boost centered around 45Hz will be added. In the "OFF" position no boost is added to the output
signal. This boost switch is available on specific models only. Please see specification chart for verification. Crossfire
highly recommends using this feature only on amplifiers powering subwoofers.
SIGNAL INPUTS
VR AMPLIFIERS
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