Tuning Hint: A trunk mounted sub whose

BASS BOOST CONTROLS

The preamp output signal is not affected by the

Speaker loads below 2 ohms nominal are not

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.

Note: The above hint is not “set-in-stone”… 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

Protect

bass boost Controls

Bass Boost

Remote

Bass Port

Bass Boost” processing selected for the amplifier or by any crossover filter selected (if the input signal is full-range, the preamp output will be full-range).

The signal level of the “Preamp Output” is

line-level (low voltage), regardless of the position

selected via the G-MAX’sInput Voltage” switch.

An additional amplifier connected to these preamp outputs should have its input voltage switch set to the “Low” position.

recommended and may cause the amplifier to initiate a protection mode which reduces power output.

You will notice that there are two “+” positive connections and two negative connections. This is to facilitate multiple speaker wiring. The two positive and two negative connections are connected in parallel inside the amplifier. Connecting two speakers, each to one set of positive and negative terminals, will result in a

appropriate filter slope.

3) 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 13) 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.

4) Defeating the Amplifier Filter: The Low-

Pass 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 “Bass Boost

processing (see next section for details). With

the internal crossover turned off, the G-MAX’s

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

The “Filter Mode” switch in the “Amplifier Controls” 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.

Pre-OUTS

The G-MAX incorporates a pass-through preamp output section, so that additional amplifiers can be easily added to the system. The preamp output delivers the same signal that is connected to the G-MAX’s inputs.

If you plan to use the “Pre-Outs” to feed a stereo amplifier, you must connect a stereo signal to the input of the amplifier. A mono signal into the amplifier will result in a mono signal out of the preamp output.

Speaker OUTPUTS

The G-MAX’s speaker outputs are designed to accept 16 AWG - 8 AWG wire.

The G-MAX is designed to deliver power into speaker loads equal to or greater than 2 ohms.

To connect the speaker wires to the amplifier, first back out the set screws own the top of the terminal block, using the supplied 2.5 mm hex 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.

parallel speaker connection. If only connecting one pair of speaker wires, it is not necessary to use both sets of connections.

upper frequency response limit is 250 Hz, due

to its bass-specific Class D design.

CH 1 (Left)

CH 2 (Right)

Pre-outs

Power

8

JL AUDIO G-MAX

JL AUDIO G-MAX

9

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JL Audio RBC-1 owner manual Bass BOOST CONTROLS, Speaker loads below 2 ohms nominal are not, Pre-OUTS, Speaker Outputs

RBC-1 specifications

The JL Audio RBC-1 is a premium remote bass control designed for audiophiles seeking complete command over their subwoofer performance. This innovative device seamlessly provides adjustable bass levels, enhancing the overall listening experience while maintaining audio clarity.

One of the standout features of the RBC-1 is its intuitive design. The knob allows users to easily adjust the bass output on the fly, ensuring optimal sound for any listening environment. Its sleek, compact form factor makes it easy to install and integrate into any vehicle's interior without being intrusive. The RBC-1 can be conveniently mounted on the dashboard or center console, providing users with direct access to bass adjustments while driving.

The RBC-1 utilizes a high-quality, durable construction that signifies JL Audio's commitment to excellence. Its robust body is designed to withstand the rigors of vehicle use, while the brushed aluminum finish lends a sophisticated touch. This attention to detail ensures not only longevity but also a visually appealing addition to any audio setup.

Technologically, the RBC-1 is compatible with a wide range of JL Audio amplifiers that feature remote control capabilities. This flexibility allows users to easily pair the RBC-1 with existing systems or new installations, making it an ideal choice for both upgrades and fresh setups. The RBC-1 comes with an adjustable cable that facilitates installation, providing ample length to reach your desired mounting location.

Another key characteristic of the JL Audio RBC-1 is the clear and precise adjustment it offers. Users will notice that the smooth rotary control allows for refined changes in bass levels, making it easy to fine-tune sound output according to personal preferences or varying music genres. This precision is especially appreciated in subwoofer performance, ensuring that bass notes remain powerful without overpowering other frequencies.

In conclusion, the JL Audio RBC-1 is an essential tool for any serious car audio enthusiast. With its blend of intuitive control, robust construction, and compatibility with JL Audio amplifiers, it elevates the subwoofer experience to new heights. Whether you're listening to your favorite tracks on a long drive or showcasing your sound system to friends, the RBC-1 empowers you to deliver the bass performance you desire. This thoughtful integration of design and functionality makes it a must-have component for both casual listeners and serious audiophiles alike.