Inputs and Outputs
Amplifier Design: Class-D amplifiers boast
higher efficiency, produce much less heat, and draw less current than
traditional Class-AB amps. The PDX series is Alpine's totally new
super-efficient power density design of full range class-D amps. They combine
MOSFET power supplies, MOSFET final outputs, and a
thermal management processor, along with a 4-Layer Glass Epoxy PC Board to
create a high-end sound quality without the bulky heat sinks required by most
amps with this much power.
Marine Ready: The Alpine PDX Marine-ready amplifiers are
constructed from UV-resistant materials with corrosion-resistant hardware. The
marine coating system helps the amp surpass the specifications for Salt/Fog
(ASTM B117) and UV (ASTM G154/D4329) resistance.
Alpine's unique STAR (Signal Transit for Accurate Response) Circuit PCB design
provides a single common ground for all amp sub-blocks, preventing ground
interference and minimizing internal noise.
For wiring convenience all the inputs and outputs on the amp are on one
The amplifier comes with a certificate that lists
the RMS power output of the individual amplifier. It also lists the model
number, serial number, test date, and the test conditions (14.4 volts, 4 ohms).
Crossovers: The front and rear channels have independent
crossovers that can be set for high-pass, low-pass, or Off (for full-range
operations). The crossovers are continuously variable from 30-400Hz with a slope
of 12 dB per octave.
The PDX series amps use a new Speaker Quick Connect plug to attach the speaker
wires to the amp. Bare speaker wire, up to 8 gauge, is held in place by a set
screw, the Quick Connect plug then plugs into the amp. Like an RCA jack, the
Quick Connect plug uses a center positive layout, so it fits two ways and both
maintain correct polarity.
Stack Amps: Because the PDX series design
generates so little heat, up to three amps can be stacked and bolted together.
The other PDX Marine amp in the series, the PDX-1.600M shares the
same footprint, so the two amps can be stacked together.
The top mounted LED Power/Status indicator glows blue when operating
normally and red when one of the protection circuits engages.
Protection Circuits: This
amplifier includes protection circuits to prevent damage due to the following
conditions: ambient temperature too high, supply current too high, short to ground,
or over voltage.
Controls (front of unit):
The controls are hidden and protected by a removable metal door. The door is
removed by unscrewing one hex-head screw with the supplied Allen-wrench. The
door can be secured once the controls are set.
- Crossover Mode switch: set to HP (high pass),
OFF (full range) or
LP (low-pass), separate controls for the front and rear channels
- Crossover Frequency:
rotary controls used to select the crossover frequency, separate controls
for the front and rear channels, variable from 30 to
- Gain control: rotary
controls used to set the amplifier's gain according the level of the incoming
signal, separate controls for the front and rear channels, continuously variable from 0.2V to 4.0V
- Input switch:
set to 1+3/2+4 (input 1 and 3 summed to feed channel 3, inputs 2 and 4
summed to feed channel 4, this makes channels 3 and 4 non-fading), 3/4
(channels 3 and 4 fed by inputs 3 and 4, maintains fader when head unit has
front and rear line outputs), or 1/2 (channels 3 and 4 fed by inputs 1 and
2, no Y-adapters needed when head unit has only one pair of line outputs)
Inputs and Outputs (rear of
- Power and Ground terminals: power and
ground terminals are gold plated set screw terminals, will accept up to 4
gauge bare wire, Alpine recommends 6 gauge minimum
- Remote Turn-on terminal:
gold plated set screw terminal, will accept up to 10 gauge bare wire
Speaker terminals: each
of the 4 speaker outputs uses Alpine's Speaker Quick Connect plug
Line Level Input: 4 female RCA jacks, left and right
for the front and rear channels, gold plated