For example, if you are using the HD600/4 in a

For example, if you are using the HD600/4 in a

stand-alone bi-amplified mode, you may want the

HD-RLC to only affect the level of the subwoofer

channels. Setting the “Remote Level Control” switch to the “Rear Ch.” position accomplishes this (provided the subwoofer system is connected to the rear channels).

In other cases, you may want control of all four channels at the same time, so you would set the “Remote Level Control” switch to the “All Ch.” position.

The RBC-1 Remote Bass Control used with

JL Audio Slash, Slash v2, e-Series, A-Series and G-Series amplifiers is NOT compatible with the HD Series amplifiers. If you attempt to connect an RBC-1 to an HD amplifer, the control will not work. You must use the HD-RLC controller.

Speaker OUTPUTS

The HD600/4 employs JL Audio’s exclusive Regulated, Intelligent Power Supply (R.I.P.S.) design. The operation of the R.I.P.S. system is independent for each pair of channels. This sophisticated power supply allows the amplifier to produce its optimum power (150 watts x 4) over a wide range of speaker impedances.

Unlike conventional amplifiers that require a specific impedance to produce optimum power, the R.I.P.S.-equipped HD600/4 gives you the freedom to use a variety of speaker configurations that achieve final nominal impedances between 1.5 – 4Ω per channel in stereo (without sacrificing power output or sound quality). When bridged, each channel pair will optimize output at 300 watts between 3 – 8Ω.

The operation of the R.I.P.S. circuitry is entirely automatic and adjusts itself every time the amplifier is turned on. There are no user controls to configure. The system operates through multiple stages of impedance optimization, choosing the stage most appropriate to the actual impedance of the speakers you connect to it.

If you connect a load higher than 4Ω nominal per channel in stereo mode (or 8Ω in bridged mode), power will drop by half with every doubling of impedance above 4Ω stereo / 8Ω mono. If you connect a load lower than 1.5Ω nominal per channel in stereo mode (or 3Ω in bridged mode, the amplifier protection circuitry activates a “safe” mode which reduces amplifier power to protect the circuitry from failure (the LED status indicator on the control panel will light up amber to indicate that this has happened). See page 16 for details.

Speaker loads below 1.5Ω nominal per channel in stereo or 3Ω nominal in bridged mode are not recommended and may cause the amplifier output to distort excessively.

Bridging Considerations Bridging is the practice of combining the

output of two amplifier channels to drive a single load. When bridged, each channel produces signals of equal magnitude, but opposite polarity. The combined output of the two channels provides twice the output voltage available from a single channel. The HD600/4 has been designed for bridging of its channel pairs without the need for input inversion adaptors.

To bridge a pair of channels, use the “Left +” and “Right –”speaker connectors only

(the “Left –”and “Right +” remain unused). Then connect a mono signal to both left and right RCA inputs for that channel pair. This requires an RCA “Y-Adaptor” (sold separately), because a bridged pair of channels requires that both amplifier channels of the bridged pair receive input. Connection of only one RCA input will result in reduced power output, increased distortion and can cause the amplifier to overheat.

When bridged, each channel pair will deliver optimum power into a 3-8Ω load. Operating bridged channel pairs into a load lower than 3Ω is not recommended.

Speaker Connector Plugs

To connect the speaker wires to the amplifier, unplug the speaker connector plugs from the amplifier chassis (pull back firmly) and back out the set screws on each connector plug, using the supplied 2.0 mm hex wrench. Strip 3/8 inch (10

mm)of insulation from the end of each wire and insert the bare wire into the receptacle on the speaker connector plug, seating it firmly so that no bare wire is exposed. While holding each wire in place, tighten each set screw firmly, taking care not to strip the head of the screw.

14 JL Audio - HD600/4 Owner’s Manual

HD600/4 specifications

JL Audio's HD600/4 amplifier stands as a testament to the brand's dedication to quality and performance in the realm of car audio. Renowned for delivering powerful, clean sound, this amplifier is designed to meet the needs of audiophiles and casual listeners alike. With a compact design and impressive specifications, the HD600/4 is a four-channel amplifier that provides robust power to enhance your listening experience.

One of the standout features of the HD600/4 is its high-efficiency Class D topology. This technology allows the amplifier to produce more power while consuming less energy, resulting in a cooler operating temperature and less strain on your vehicle’s electrical system. The efficient design also means that the HD600/4 can deliver an astounding 75 watts RMS per channel at 4 ohms, and even more power when configured at lower impedances. This ensures clear and dynamic audio reproduction across a wide range of sources, from music to voice.

The HD600/4 also incorporates JL Audio's advanced signal processing capabilities. With adjustable crossover settings, users can precisely tailor the sound to match their specific requirements. The built-in high-pass and low-pass filters allow for easy integration with subwoofers and other speakers, ensuring a seamless audio experience regardless of the setup. Additionally, the amplifier features a line/ speaker level input, making it versatile enough to work with various audio sources.

Durability is another hallmark of the HD600/4. Constructed with high-quality materials, it features a robust aluminum chassis that not only enhances aesthetic appeal but also provides effective heat dissipation. The amplifier's design includes thoughtful engineering features such as a variable gain control per channel and advanced protection circuitry that safeguards against overheating and short circuiting.

The sleek and compact design of the HD600/4 makes it easier for installation in various vehicle types without sacrificing valuable space. With a mounting depth of just over 6 inches, it can fit into tight spaces, making it an attractive option for those seeking high-performance audio without the bulk of traditional amplifiers.

In conclusion, the JL Audio HD600/4 embodies high-quality engineering, power efficiency, and adaptability. Its combination of advanced technologies, user-friendly features, and robust build quality make it a top choice for car audio enthusiasts looking to elevate their listening experience to new heights. With the HD600/4, users can expect nothing less than the exceptional audio performance that JL Audio is known for.