JL Audio e2150 manual 4

TURN-ON LEAD

The e2150 uses a conventional +12V remote turn-on lead, typically controlled by the source unit's remote turn-on output.The amplifier will turn on when +12V is present at its “Remote” input and turn off when +12V is switched off. If a source unit does not have a dedicated remote turn-on output, the amplifier’s turn-on lead can be connected to +12V via a switch that derives power from an ignition-switched circuit.

AMPLIFIER CONTROLS

Input Sensitivity

This control, labeled “Input Sens.”, can be used to match the source unit's output voltage to the input stage of the e2150 for maximum clean output. Rotating the control clockwise will result in higher sensitivity (louder for a given input voltage). Rotating the control counter-clockwise will result in lower sensitivity (quieter for a given input voltage.)

To properly set the amplifier for maximum clean

BASS BOOST CONTROLS

The e2150's “Remote” turn-on connector is designed to accept 18 AWG – 12 AWG wire.To connect the remote turn-on wire to the amplifier, first back out the set screw on the top of the terminal block, using the supplied 2.5 mm hex wrench. Strip 1/2 inch (12mm) of wire and insert the bare wire into the terminal block, seating it firmly so that no bare wire is exposed.While holding the wire in the terminal, tighten the set screw firmly, taking care not to strip the head of the screw and making sure that the wire is firmly gripped by the set screw.

INPUT SECTION

The e2150 has one input section with two distinct input connection options.These are:

1)A pair of traditional RCA type connections designed to accept input from source units with line level outputs.

2)A four-pin connector designed to accept input from amplified sources such as factory source units or source units not equipped with line level outputs.

output, please refer to Appendix A (page 10). After using this procedure, you can then adjust the “Input Sens.” level downward if this is required to achieve the desired system balance.

Do not increase any “Input Sens.” setting for any channel(s) of any amplifier in the system beyond the maximum level established during the procedure outlined in Appendix A (page 10). Doing so will result in audible distortion and possible speaker damage.

Filter Controls

Most speakers are not designed to reproduce the full range of frequencies audible by the human ear. For this reason, most speaker systems are comprised of multiple speakers, each dedicated to reproducing a specific frequency range. Filters are used to select which frequency range is sent to each section of a speaker system.The division of frequency ranges to different speakers can be done with passive filters (coils and/or capacitors between the amplifier outputs and the speakers), which are acceptable and commonly used for filtering between mids and tweeters. Filtering between subwoofer systems and satellite speaker systems is best done with active filters, which cut off frequency content at the input to the amplifier. Active filters are more stable than passive filters and do not introduce extraneous resistance, which can degrade subwoofer performance.

The active filter built into the e2150 can be used to eliminate potentially harmful and/or undesired frequencies from making their way through the amplifier section to the speaker(s).This serves to improve tonal balance and to avoid distortion and possible speaker failure. Correct use of this filter can substantially increase the longevity and fidelity of your audio system.

1)“Filter Mode” Control: The e2150 employs a 12dB per octave filter.This filter can be configured into one of two filter types or defeated completely by way of the three-position “Filter Mode” switch:

“Off”: Defeats the filter completely, allowing the full range of frequencies present at the inputs to feed the amplifier.This is useful for systems utilizing outboard crossovers or requiring full-range reproduction from the e2150.

“LP” (Low-Pass): Configures the filter to attenuate frequencies above the selected filter frequency at a rate of 12dB per octave. Useful for connection of subwoofer(s) to the e2150 in a bi-amplified system. “HP” (High-Pass): Configures the filter to attenuate frequencies below the selected filter frequency at a rate of 12dB per octave. Useful for connection of coaxial or component satellite speaker systems to the e2150 in a bi-amplified system.

2)“Filter Freq. (Hz)” The filter frequency markings surrounding this rotary control are for reference purposes and are generally accurate to within 1/3 octave or better. If you would like to select the filter cutoff frequency with a higher level of precision, consult the chart in Appendix B (page 11).

Tuning Hint: If you are using the e2150 to drive a subwoofer system (“LP” mode) or a component satellite speaker system (“HP” mode), 100 Hz is a good baseline “Filter Freq. (Hz)” setting. After properly adjusting the “Input Sens.”, as outlined in Appendix A (page 10), you can fine tune the “Filter Freq. (Hz)” control to achieve the desired system frequency response.

1)Bass Boost: This switch allows the user to activate a 6 dB boost centered at 48 Hz. When the

“Bass Boost” is activated, the inputs to “CH 1 (Left)” and “CH 2 (Right)” are summed to create a mono signal.The “Filter Mode” switch in the “Channel 1 & 2” section must be in the “LP” position for the bass boost to be functional.

2)Remote Bass Port: This port allows you to connect an optional remote boost knob (sold separately, JL Audio Model RBC-1) that can be mounted in the front of the vehicle. With the RBC-1 connected, the boost is no longer limited to 0 or +6 dB, allowing a range of 0 - 12 dB of boost to be selected.

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