Channel Design: The Alpine PDR-F50 can be configured as a
4-channel, 3-channel, or 2-channel amplifier. The amplifier is stable to
2-ohms in stereo, 4-ohms when bridged.
CEA-2006 Compliant: CEA-2006 is a system of testing and
measurement for mobile audio amplifiers. This voluntary standard advocates a
uniform method for measuring an amplifier's RMS power output and signal-to-noise
ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts
and the RMS power output is measured into a 4Ω load, with 1% or less Total
Harmonic Distortion plus noise (THD+N), and over a frequency range of 20 Hz to
20 kHz (for full range amplifiers). Signal-to-Noise ratio is measured in
weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006
standards allow consumers to compare car amplifiers and receivers under the same
conditions (apples to apples). Using CEA-2006 criteria, the Alpine PDR-F50 is
rated at 85 watts RMS x 4 channels with an 87 dBA signal to noise ratio. The
signal to noise ratio at the rated power output (not CEA-2006 conditions) is 106
LED: The top mounted LED Power indicator glows blue when the
amplifier is turned on and changes to red when the protection circuit is engaged.
Auto Turn-on: When using a speaker level input, the amp will
turn on automatically when it senses the input signal.
Verification Certificate: The amplifier comes with a
certificate that lists the RMS power output of the specific amplifier. It also
lists the model number, serial number, test date, and the test conditions (14.4
volts, 2 ohms).
Hidden Controls: The amplifier's controls are hidden under
a cover plate. The plate is removed by unscrewing two machine screws with the
supplied 2mm Allen wrench.
Gain control: There are independent rotary gain controls
for the channel-1/2 and channel-3/4 amplifier sections. The gain settings are
continuously variable from 0.2 to 4.0 volts.
Crossover: The amp has independent crossover mode and
frequency controls for channels-1/2 and 3/4:
- Mode: choose off (crossover is
bypassed), high pass, or low pass
- Frequency: rotary dial; 50-400
Input: The two position input switch configures the inputs:
- 1/2: only inputs 1/2 are used, and
are shorted to channels 3/4
- 3/4: all four RCA inputs are used
Bass Boost: The bass boost circuit provides +6 dB or +12
dB signal boost centered at 50 Hz to channels-3/4. The bass boost can also be
Terminal Layout: For wiring convenience, all of the inputs
and outputs on the amplifier are on one side.
Power Input: Two set-screw terminals are provided for
connecting the power and ground cables. The terminals accept up to 4-gauge wire
(a 4-gauge wiring kit is recommended). The set screws are tightened/loosened
with the included 3mm Allen wrench.
Remote Turn-on: The remote turn-on set screw terminal will
accept up to 12-gauge wire. The set screw is tightened/loosened with the
included 2mm Allen wrench.
Speaker Outputs: The four pair of speaker outputs set-screw
terminals will accept up to 12-gauge wire. The set screws are tightened/loosened
with the included 2mm Allen wrench.
Signal Input: The Alpine PDR-F50 is equipped with two pair
of female RCA jack inputs; Channel-1/2 and Channel-3/4. The RCA inputs will accept either
speaker-level or line level signals from your car's head unit. A speaker level
signal is connected to the RCA inputs using a speaker wire to RCA adapter (sold
Fuses: The amp is protected with two 30-amp ATO
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