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Amplifier: The power output from the built-in class-D
amplifier is 90 watts RMS @ 14.4 volts with no more than 1% THD (100 watts RMS @
14.4 volts and 10% THD).
Signal Input: The signal input wires on the included harness can be
used with a speaker level or line level signal. Standard speaker wire is used in the harness,
so an RCA to speaker wire adapter is needed when using a line level signal (item number
20609ZISL, sold separately).
Low Pass Crossover: The amplifier's low pass crossover point is
continuously variable from 50 to 120 Hz; the crossover slope is 12 dB per octave.
Subsonic Filter: In addition to the low pass crossover, the
PT8 features a 24 dB/octave subsonic filter fixed at 25 Hz. Ultra-low frequencies
that cannot be reproduced by a subwoofer do not become sound, but unnecessary
oscillations that cause distortion. These frequencies also waste amplifier power
and can damage the speaker. The built-in subsonic filter removes the frequencies
below 25 Hz to improve the sound quality by eliminating harmful distortion.
Bass Boost: The bass boost circuit provides a variable (0-6
dB) signal boost centered at 40 Hz.
Status Indicator Light: There is a status indicator LED on
the control panel on the left side of the enclosure; it lights green to indicate
that the amplifier is turned on and operating normally and lights Red to indicate
the amplifier's protection circuitry has been activated.
Remote Bass Level Control: The included remote bass level
control lets you adjust the output level of the amplifier from anywhere in the
vehicle. A 20' cable is included and when it's plugged in, the gain control on
the side of the enclosure is bypassed. The remote bass level control can be
mounted under the dash with the included mounting hardware, it has the
- Width: 2.215"
- Height: 1.193"
- Depth: 1.718" (3.076"
including the knob and cable)
Controls: All the PT8's controls and connections are located
on the left side:
- Auto Turn-On: two position switch; choose +12V
(amp turns on when +12 volts is applied to the remote turn-on wire)
or DC Offset (amp turns on when a 6 volt surge is detected from a
speaker-level source on the signal inputs; in this mode the amp's
remote turn-on wire acts as a +12 volt output to turn on another
- Input Level: two position switch; choose Hi
when using a speaker level input, Lo when using a line level input
- Phase: two position switch, the sub's phase
can be easily inverted; 0° or 180°
- Gain: rotary knob; continuously variable from
125mV to 5V when the Input Level switch is set to Lo, 250mV-10V when
the Input Level switch is set to Hi
- X-Over Frequency: rotary knob; set the low pass
x-over point; continuously variable from 50 Hz to 120 Hz
- Bass Boost: rotary knob; continuously variable
from 0 to +6 dB
- Remote Bass: 3.5mm mini-jack for use with the
included remote bass level control
- Fuse: a single 7.5 amp ATO style fuse protects
- Wiring Input: Molex plug for use with the included
power/ground/remote turn-on/signal input harness; the wire length varies
- Ground: 18"
- Signal Input: 16'
- Power: 19'
- Remote Turn-on: 20'