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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, 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. Should you  

decide to install the amplifier yourself, please take the time  

to read this manual thoroughly so as to familiarize yourself  

with its installation requirements and setup procedures.

If you have any questions regarding the instructions in this  

manual or any aspect of your amplifier’s operation, please contact your 

authorized JL Audio dealer for assistance. If you need further assistance, 

please call the JL Audio Technical Support Department  

at (954) 443-1100 during business hours.

OWNER’S MANUAL

300W Monoblock Subwoofer Amplifier

Summary of Contents for NexD XD300/1

Page 1: ...on equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself please take the time to read this manual thoroughly so as to familiarize yourself with...

Page 2: ...io system in a manner that still allows you to hear necessary noises to operate your vehicle safely horns sirens etc SERIAL NUMBER In the event that your amplifier requires service or is ever stolen y...

Page 3: ...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...

Page 4: ...signal cables and remote turn on wire from the source unit to the final amplifier mounting location 5 Run speaker cables from the speaker systems to the amplifier mounting location 6 Find a good soli...

Page 5: ...care not to strip the head of the screw The ground connection should be made using 4 AWG wire and should be kept as short as possible while accessing a solid piece of sheet metal in the vehicle The su...

Page 6: ...XJUDI UIBU EFSJWFT power from an ignition switched circuit 5IF 9 T iRemotew UVSO PO DPOOFDUPS JT EFTJHOFE UP BDDFQU 8 o 8 XJSF 5P connect the remote turn on wire to the amplifier first back out the se...

Page 7: ...a pair of RCA plugs for each input pair or use VEJP QBSU 9 3 48 P iMJOF PVUQVU DPOWFSUFSw JT OFFEFE JO NPTU DBTFT If you find that the output cannot be reduced sufficiently with a direct speaker level...

Page 8: ...via the LP Filter Mode Slopew TXJUDI FQFOEJOH PO UIF TVCXPPGFS TZTUFN BOE the vehicle different slopes may be required to produce a smooth transition to the mid bass speakers in the system Experiment...

Page 9: ...tation the audio will mute completely At full clockwise rotation the level XJMM CF UIF TBNF BT JG UIF 3 XBT OPU connected at all In other words it operates strictly as a level attenuator PREOUTS 5IF 9...

Page 10: ...er to initiate a protection mode which reduces power output STATUS LED PROTECTION CIRCUITRY 5IFSF JT B TJOHMF NVMUJ DPMPS PO UIF UPQ surface of the amplifier to indicate the amplifier s operating stat...

Page 11: ...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 natur...

Page 12: ...adjustment according to the nominal impedance of the speaker system connected to the amplifier outputs 6 Verify that you have disconnected the speakers CFGPSF QSPDFFEJOH 1MBZ B USBDL XJUI BO appropri...

Page 13: ...Amplifier Topology NexD High Speed Class D Power Supply Unregulated MOSFET switching type Rated Power at 14 4V with less than 1 THD Noise 20Hz 20 kHz 200W RMS x 1 4 ohms 300W RMS x 1 2 ohms Rated Pow...

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

Page 15: ...t 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 amplified b...

Page 16: ...16 JL Audio XD300 1 Owner s Manual 17 ENGLISH INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions...

Page 17: ...inal purchase at 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 no...

Page 18: ...Printed in China XD300 1 MAN 08 2010 w w w j l a u d i o c o m...

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