User manual JL AUDIO E1800D

[. . . ] JL AUDIO e1800D monoblock subwoofer amplifier o w n e r 's m a n u a l Thank you for purchasing a JL Audio amplifier for your automotive sound system. Your amplifier has been designed and manufactured to exacting standards in order to ensure years of musical enjoyment in your vehicle. For maximum performance and extended warranty coverage, we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer. Your authorized dealer has the training, expertise and installation equipment to ensure optimum performance from this product. [. . . ] The active filter built into the e1800D can be used to eliminate potentially harmful and/or undesired frequencies from making their way through the amplifier section to the subwoofer(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. You may run a stereo or a mono signal into the inputs of the amplifier. The amplifier's input section automatically sums stereo signals to mono for the internal amplifier section. The e1800D employs a sophisticated, variable, low-pass active filter for its internal channel. This feature is designed to attenuate frequencies above its filter frequency, so that the system's subwoofers do not reproduce any audible midrange content. 1) Filter Operation: The low-pass filter in the e1800D is fully variable between 40 Hz and 200 Hz via the "Filter Freq. " control knob and features the ability to select between a moderate "12dB" per octave or a steep "24dB" per octave slope via the "Mode/Slope" switch. Depending on the subwoofer system and the vehicle, different slopes may be required to produce a smooth transition to the mid-bass speakers in the system. Experiment to find the slope which best matches the acoustic requirements of your system. Hint: A trunk mounted sub whose output has to "fight" through a rear deck or a back seat often benefits from the 12 dB/octave slope which lets more upper bass content pass through. A sub that fires directly into the listening environment is more likely to benefit from a 24 dB/octave slope. You should always listen to the system carefully to determine the best choice as vehicle acoustics and other factors play a big role in choosing the most appropriate filter slope. 2) Precise Frequency Selection: The filter frequency markings on the front panel of the amplifier are for reference purposes and are generally accurate to within 1/3 octave or better. If you would like to select the filter frequency with a higher level of precision, consult Appendix B (page 11) of this manual. This chart gives you a more accurate frequency for each of the forty detented positions of the frequency selection control. This method can be very useful if the amplifier is mounted in a location where you can't see the front panel markings easily. 3) Defeating the Amplifier Filter: The LowPass filter can also be defeated completely, by switching the "Mode/Slope" switch to the "Off" position. This is useful if you are using an external active crossover in the system. Keep in mind that turning the internal crossover off also defeats the "Advanced Bass Control" section processing (see page 9 for details). With the internal crossover turned off, the e1800D's upper frequency response limit is 250 Hz, due to its bass-specific Class D design. BASS BOOST CONTROLS 1) Bass Boost: This switch allows the user to activate a 6 dB boost centered at 48 Hz. The "Filter Mode" switch in the "Channel 1 & 2" section must be in the "LP" position for the bass boost to be functional. 6 JL AUDIO e1800D JL AUDIO e1800D 7 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. PRE-OUTS The e1800D's "Pre-Outs" connectors output unprocessed (pass-through) left and right channel preamp level signals, permitting connection of additional amplifiers in a system. wrench. Strip 1/2 inch (12 mm) of insulation from the end of each 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 place, tighten the set screw firmly, taking care not to strip the head of the screw. AMPLIFIER STATUS INDICATOR LIGHTS / PROTECTION CIRCUITRY There are two status indicator lights on the input / control end of the amplifier: SERVICING YOUR JL AUDIO AMPLIFIER If your amplifier fails or malfunctions, please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. Do not attempt to service the amplifier yourself or through unauthorized repair facilities. This will not only void the warranty, but may result in the creation of more problems within the amplifier. If you have any questions about the installation or setup of the amplifier not covered in this manual, please contact your dealer or the JL AUDIO Technical Department for assistance: (954) 443-1100 9:00 AM ­ 5:30 PM Eastern Time, Monday ­ Friday ! I MP ORTA N T When using either the line level inputs (RCA input connections) or the "High Level Inputs" (four-pin connector), the output signals are identical to the input signals. [. . . ] This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading sufficient voltage, check your speaker connections as explained below. Check to ensure that the speaker wires are making a good connection with the metal inside the terminal block. Make sure that 1/2 inch (12 mm) of insulation has been stripped from the end of each wire and the bare wire is seated firmly in the terminal block so that no bare wire is exposed. [. . . ]