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Cooling Efficiency Considerations: 

The outer shell of your JL Audio amplifier  

is designed to remove heat from the amplifier 
circuitry. For optimum cooling performance,  
this outer shell should be exposed to the  
largest possible volume of air. Enclosing the 
amplifier in a small, poorly ventilated chamber 
can lead to excessive heat build-up and degraded 
performance. If an installation calls for an 
enclosure around the amplifier, we recommend 
that this enclosure be ventilated with the aid  
of a fan. In normal applications, fan-cooling is  
not necessary. 

 

Mounting the amplifier upside down is  

strongly discouraged. If mounting the amplifier 

under a seat, make sure there is at least 1 inch 

(2.5 cm) of space above the amplifier’s outer 

shell to permit proper cooling.

Safety Considerations: 

Your amplifier needs to be installed in a dry, 

well-ventilated environment and in a manner 
which does not interfere with your vehicle’s safety 
equipment (air bags, seat belt systems, ABS brake 
systems, etc.). You should also take the time to 
securely mount the amplifier so that it does not 
come loose in the event of a collision or a sudden 
jolt to the vehicle. 
 

Stupid Mistakes to Avoid: 
•  

Check before drilling any holes in your vehicle 
to make sure that you will not be drilling 
through a gas tank, brake line, wiring harness or 
other vital vehicle system.

•  Do not run system wiring outside or underneath 

the vehicle. This is an extremely dangerous 
practice which can result in severe damage to 
your vehicle and person.

•  Protect all system wires from sharp metal edges 

and wear by carefully routing them, tying  
them down and using grommets and loom 
where appropriate.

•  Do not mount the amplifier in the engine 

compartment, under the vehicle, on the roof or 
in any other area that will expose the amplifier 
circuitry to the elements.

 

Status

LED

(pg. 10)

 

Low Z

(pg. 6)

 

Turn-On

Mode

(pg. 6)

 

Input

Voltage

(pg. 7)

Bass Boost

(pg. 8)

 

Input Sensitivity

Control

(pg. 7)

Clipping

Indicator

(pg. 7)

Low-Pass Filter 

Frequency

Selector

(pg. 8)

Remote Turn-On 

Connector

(pg. 6)

Chassis Ground 

Connector

(pg. 5)

Left & Right

Output Jacks

(pg. 9)

+12 V Power 

Connector

(pg. 5)

Subwoofer 

Outputs

(pg. 9)

Remote Level 

Control

(pg. 8)

Left & Right 

Input Jacks

(pg. 7)

Summary of Contents for NexD RD1500/1

Page 1: ...rized JL Audio dealer Your authorized dealer has the training expertise and installation equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself p...

Page 2: ...und on the bottom panel of the amplifier and on the amplifier packaging Serial Number INSTALLATION APPLICATIONS This amplifier is designed for operation in vehicles with 12 volt negative ground electr...

Page 3: ...anner which does not interfere with your vehicle s safety equipment air bags seat belt systems ABS brake systems etc You should also take the time to securely mount the amplifier so that it does not c...

Page 4: ...speaker systems to the amplifier mounting location 6 Find a good solid metal grounding point close to the amplifier and connect the negative power wire to it using appropriate hardware use of the JL A...

Page 5: ...w The ground connection should be made using 2 AWG copper wire and should be kept as short as possible while accessing a solid piece of sheet metal in the vehicle The surface of the sheet metal should...

Page 6: ...rminal 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 If a source unit does not have a dedicated remote tu...

Page 7: ...n you should select The High position on the Input Voltage switch selects an input sensitivity range between 800mV and 8V for all input channels This is useful for certain high output preamp level sig...

Page 8: ...void distortion Correct use of the filter can substantially improve the fidelity of your audio system LP Filter Operation The RD 500 1 monoblock employs a 12 dB per octave low pass active filter with...

Page 9: ...of the preamp output SUBWOOFER OUTPUTS The RD1500 1 is designed to deliver power into subwoofer loads equal to or greater than 1 ohm of nominal impedance The RD1500 1 s subwoofer outputs are designed...

Page 10: ...ondition remains it will return to red and mute the output again A continuous over current condition is displayed with alternating red blue lights Because the muting behavior may be very short in dura...

Page 11: ...try 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 wa...

Page 12: ...or reasonable gain overlap with moderate clipping at full volume 5 Verify that you have disconnected the speakers before proceeding Play a track with an appropriate sine wave within the frequency rang...

Page 13: ...B referred to 1W A weighted 20 Hz 20 kHz noise bandwidth Frequency Response 7 Hz 500 Hz 0 1dB Damping Factor 1100 4 ohms 50 Hz 550 2 ohms 50 Hz Input Section No of Inputs One Stereo Pair Input Type Di...

Page 14: ...s required To test for this problem jump the 12VDC wire to the Remote terminal to see if the amplifier turns on I hear a repetitive ticking or popping sound coming out of the speaker s Check Check the...

Page 15: ...e unit while an appropriate test tone is played through the source unit disconnect the input cables from the amplifier prior to this test The frequency used should be in the range that is to be amplif...

Page 16: ...16 JL Audio RD1500 1 Owner s Manual INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions...

Page 17: ...17...

Page 18: ...18 JL Audio RD1500 1 Owner s Manual NOTES...

Page 19: ...19 NOTES...

Page 20: ...retail and no warranties whether express or implied shall apply to this product thereafter Some states do not allow limitations on implied warranties therefore these exclusions may not apply to you Th...

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