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Mono Subwoofer Amplifier: The JL Audio J2 250.1 is a class A/B
monoblock subwoofer amplifier rated at 175 watts RMS x 1 into a 4Ω load, 210
watts RMS x 1 into a 3Ω load, and 250 watts RMS x 1 into a 2Ω load.
Status Indicator Lights: There are two lights on the left side
of the amplifier:
- Power: green LED indicates the
amplifier is turned on and operating normally
- Protect: red LED indicates the
amplifier has exceeded its safe operating temperature
or detected a short in the speaker outputs
Active Crossover: The low-pass crossover is continuously variable
from 60 Hz to 240 Hz and cannot be bypassed. The crossover slope is 12 dB/octave.
Bass Boost: The bass boost circuit is adjustable from 0 to +9
dB. The boost frequency is fixed at 45 Hz.
Remote Level Control: The 14' cable attached to the included
Remote Level Control plugs into the 3.5mm jack on the left side of the amp. When
the module is connected, you can control the subwoofer volume from the driver's
seat. The remote is designed to mount under the dash and measures:
- Width: 2.513"
- Height: 1.026"
- Depth: 1.656" (2.325"
including cable and knob)
Power and Ground: The Power and Ground connections accept 4 to 8
gauge wire; JL Audio recommends 8 gauge as the minimum size. The set-screw terminals
are tightened/loosened using the included 3mm Allen wrench.
Remote Turn-On: The remote terminal will accept 10 to 18 gauge
wire. The set-screw terminal is tightened/loosened using the included 2mm Allen
Speaker Outputs: The two speaker terminals are internally wired in
parallel for easy connection of two subwoofers (2Ω minimum when using one sub,
4Ω minimum when using two subs). The set-screw terminals are tightened/loosened
using the included 2.5mm Allen wrench and will accept 8 to 16 gauge speaker wire.
Preamp Inputs: The amplifier features one set of RCA line level
inputs. The input sensitivity is adjustable from 200mV to 4V RMS.
Note: When using a single RCA input,
JL Audio recommends using a Y adapter to feed a signal to
both RCA jacks.
Speaker Inputs: When connecting the amp to a head unit without
line level outputs, use the included speaker level input harness. In this case the
input sensitivity is adjustable from 630mV to 20.5V RMS.
Preamp Outputs: There is a pair of preamp outputs so you can
send audio to another amplifier in your system. The preamp output is not affected
by the crossover or bass boost circuits.