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Built-in Crossovers
Protection Circuitry
All D-SERIES amplifiers feature built-in electronic crossovers.
The 2 Channel amplifiers(D400.2/D650.2/D1000.2) feature an adjustable low pass and high pass cross
-overs and +12dB variable Bass Boost.
The 4 Channel amplifiers(D350.4/D500.4) feature a pair of individually adjustable low pass crossovers
and high pass crossovers, as well as and +12dB variable Bass Boost.
All D-SERIES amplifiers have been designed with 100% MOSFET power supplies, ensuring extremely
quick switching response and self-protection.
The amplifier protection circuitry will disable the amplifier if input overload ,short circuit or extremely high
temperature conditions are detected. When the protection mode is in operation, the LED indicator on the
If you observe that the protection LED is lit, please check the system carefully to determine what has
caused the protection circuit to engage. The amplifier can be reset by turning the remote power off and
then on again. If the amplifier shut down because of an input overload or short circuit, be sure to repair
Your D-SERIES amplifier was designed to operate efficiently at loads down to 2 Ohms.
This means that you can install four 8 Ohm speakers per channel when using parallel wiring.
of an additional 10W to each speaker.
Please note: The gain control of any car audio amplifier should not be mistaken for a volume
control. It is a sophisticated device, designed to match the output level of your audio source unit to
the input level of the amplifier . Do not adjust this input level to maximum unless your input level
requires it. Ignoring these instructions will result in an input overload to the amplifier, and excessive
2 Ohm Operation
front panel will be illuminated, indicating the amplifier has gone into a self-preservation mode.
these conditions before attempting to power up the amplifier again.
When operating at 2 Ohms, the amplifiers will increase their output power by approximately 50%. The
current draw will so increase by about the same amount, also be sure you have enough current to
run the amplifiers into a 2 Ohm load. If you lack adequate current, your music reproduction will be
distorted.
Increasing the number of woofers per channel at low frequencies (up to 100MHz) produces an acoustic
coupling effect. This acoustic coupling increases your power output by 3 dB per speaker, or the equivalent
audio distortion. It can also cause the protection circuit to engage.