JL Audio JX1000/1D (Open Box, Good)

The JL Audio JX Series of amplifiers are designed with a specific purpose; to deliver clean, rock-solid performance and reliability at an affordable price. Unlike gimmicky price-conscious amplifiers, JL Audio employs specified oversized output transistors and rugged MOSFET power supplies to unsure proper current, thermal capacity and better overall performance. In addition, the JX1000/1D includes flexible signal processing capabilities with a fully variable 12 dB/octave crossover filter, pass-through preamp outputs and a Bass EQ. With the optional JL Audio RBC-1 Remote Level Control (sold separately), you can control the subwoofer volume from the front of the vehicle.

JX monoblock subwoofer amplifiers are specifically designed to drive subwoofers. Their frequency response is limited to the range below 150 Hz., making them unsuitable for driving midrange speakers or tweeters.

Integration Flexibility

For those systems that do not offer a preamp level signal option, you can connect speaker level signals directly to the "Hi-Level Inputs" connector using the supplied connector and wire harness. Simply splice the appropriate left/right and positive/negative wires to the included harness and plug the harness into the "Hi-Level Inputs" connector on the amplifier. The JX monoblock will attenuate the high-level signal to make it compatible with its input stage. Alternatively, a traditional left/ right pair of RCA type jacks is used for preamp level (low-level) signals. This is the preferred connection method whenever available.

Low-Pass Active Filter

The JX monoblock features a 12 dB/octave low-pass active filter for its internal channel. This feature is designed to attenuate frequencies above its filter frequency, so that the system's subwoofer(s) do not reproduce any audible and often harmful mid-range frequencies. The low-pass filter is fully variable between 50 Hz and 200 Hz via the "Filter Frequency" control knob. 80 Hz is a good starting point for system tuning, but its also advisable to match the crossover point with that of your satellite speakers' high-pass filter - this ensures that your system is properly distributing the frequencies to the appropriate medium.