JL Audio JD250/1

Features

Amplifier Power Ratings:

• At 14.4 volts: >80 dB S/N, 1% THD+N
  • 4Ω: 150 watts RMS
  • 3Ω: 200 watts RMS
  • 2Ω: 250 watts RMS
• At 12.5 volts: >80 dB S/N, 1% THD+N
  • 4Ω: 115 watts RMS
  • 3Ω: 150 watts RMS
  • 2Ω: 200 watts RMS

Clipping LED: Using a 50 Hz sine-wave test tone recorded at 0 dB reference level (not included), the clipping LED helps you set the gain control to the maximum unclipped level.

Low Pass Crossover: The 12dB/octave low-pass filter is always engaged; it cannot be bypassed. The crossover point is continuously variable from 50-500 Hz.

Bass Boost: The bass boost circuit is variable from 0 to +12dB. The boost is centered at 45Hz.

Protection Circuitry: The JD250/1's protection circuitry automatically turns the amplifier off if thermal limits are exceeded, a short circuit is detected in the speaker wiring, or the input voltage drops below 11 volts.

Wired Remote: An optional RBC-1 Remote Level Control (sold separately) can be added, allowing you to adjust the amp's output level from the front of the vehicle.

Controls:

• Input Sensitivity: rotary control; used to match your source unit's output voltage to the input stage of the amplifier for maximum clean output; the range of the dial depends on how the Input Voltage switch is set
• Input Voltage: 2-position switch:
  • Low: input sensitivity control (gain) range is 200mV-2V; used with the preamp output of typical aftermarket radios
  • High: input sensitivity control (gain) range is 800mV-8V; used with speaker level outputs and high output preamps
• Low Pass Crossover Frequency: rotary control; continuously variable from 50-500 Hz
• Turn-on Mode: 3-position switch:
  • Remote: use when the source unit has a +12 volt remote turn-on wire (preferred method)
  • Offset: the amp reads a small DC signal typical on the speaker level output of factory radios (senses the offset on the left input)
  • Signal: detects a midrange speaker level signal on the input; turns off after approximately 30 with no signal
• Bass Boost: rotary control; continuously variable from 0 to +12 dB

Connections:

• Power: The power, ground, and remote turn-on connections are set-screw terminals:
  • Power and Ground: accept up to 4-gauge wire (8-gauge minimum recommended); the included 3mm hex key is used to tighten/loosen the set-screws
  • Remote Turn-on: accepts up to 10-gauge wire (18-gauge minimum recommended); the included 2.5mm hex key is used to tighten/loosen the set-screw

Note: The amplifier is not equipped with a fuse. An external 30-amp fuse (not included) must be installed on the power wire. If a wiring kit is used which includes a fuse with a value other than 30-amps, the original should be replaced with a 30-amp fuse.

• Subwoofer Output Terminals: The subwoofer outputs are set-screw terminals. They accept up to 8-gauge wire (16-gauge minimum recommended). There are two pair of outputs, internally wired in parallel, making it easy to connect two subwoofers. The included 2.5mm hex key is used to tighten/loosen the set-screws.
• Signal Inputs: The stereo RCA input jacks accept either preamp or speaker level signals. When connecting speaker level signals, a speaker wire to RCA adapter is useful. The left and right channels are internally summed to mono.
• Preamp Outputs: The stereo RCA preamp outputs pass the signal connected to the RCA inputs, so another amplifier can be added easily. The output is not affected by the JD250/1's gain, crossover, or bass boost controls. The preamp output signal is buffered to prevent noise.

Note: When the input voltage switch is set to Low, the voltage of the RCA output matches the input; when set to High, the output voltage is attenuated -12 dB.

• Remote Level Control: The RJ-25 connection is used for the optional optional RBC-1 wired remote.