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12 

 |  JL Audio - 450/4

v2

 Owner’s Manual  

13

STATUS INDICATOR LIGHTS /  
PROTECTION CIRCUITRY

There are three status indicator lights on the 

top of the amplifier.  These are as follows:

 

1)

i

Power

Green

): lights to indicate that the 

amplifier is turned on and operating normally.

 

2)

i

Thermal

Red

): lights to indicate that the 

amplifier has exceeded its safe operating 
temperature, putting the amplifier into a self-
protection mode, which reduces the power 
output of the amplifier.  The red light will shut 
off and the amplifier will return to normal, 
full-power operating mode if the heat sink 
temperature drops back to a safe level.

 

3)

i

Low Ω

Amber

): lights to indicate that the 

impedance of the speaker load connected to 
the amplifier is lower than the optimum load 
impedance range for the amplifier. When 
this light is on, a protection circuit engages 
and reduces the power output of CH 1&2 
or CH 3&4, depending on which channel is 
experiencing the problem. The amber indicator 
will also light when a short-circuit is detected 
in the speaker wiring (this can be a short 
between the positive and negative speaker 
wires or between either speaker wire and the 
vehicle chassis). This can be used to diagnose 
a short-circuit by only connecting one of the 
amplifier sections at a time (CH 1&2 and CH 

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connect the section that is experiencing the 
problem and turn the volume up.

There is only one condition that will shut 

down an undamaged 450/4v2 completely…

If battery voltage drops below 10 volts, the 

entire amplifier will shut itself off. The green 

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turn off when this occurs. The amplifier will turn 
back on when voltage climbs back above 10 volts. 
This may happen in a rapid cycle when bass-
heavy program material causes a weak charging 
system to dip below 10 volts momentarily. If this 
is happening in your system, have your charging 
system inspected to make sure it is working 
properly. For information on troubleshooting this 
amplifier, refer to Appendix C (page 24).

SERVICING YOUR JL AUDIO AMPLIFIER

If your amplifier fails or malfunctions, please 

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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 

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to service the amplifier yourself or through 

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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 technical support. 

 

JL Audio Technical Support

:  

(954) 443-1100  

9:00 AM – 5:30 PM (Eastern Time Zone)

 

Monday - Friday

I M P O RTA N T

!

 

 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 yellow “Low Ω” LED  lights to 
indicate that this has happened). See page 13 
for details.

 

 

I M P O RTA N T

!

 

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 450/4v2 has been designed for 
bridging of its channel pairs without the need for 
input inversion adaptors. 

ction

CH 3 & 4 Speaker Outputs

H 4
ght)

Sens.

Bridged: 150W x 1 (3-8Ω)

Left

Right

75W

(1.5-4Ω)

75W

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Left +

w

BOEi

Right –

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Left 

wBOEi

Right +

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a mono signal to both left and right RCA inputs 
 for that channel pair. This requires an RCA  

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XB-CLRAICY-1F2M (sold separately). 
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. 

Because a bridged pair of channels requires 

that both channels receive input, you need to 
connect both left and right RCA inputs to the 
bridged channel pair’s inputs. Connection of 
only one RCA input will result in reduced power 
output, increased distortion and can cause the 

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left and right RCA inputs.

Содержание 450/4V2

Страница 1: ...tise 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 you...

Страница 2: ...ystem Please limit your continuous exposure to high volume levels While driving operate your audio 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 you will need to have a record of the product s serial number Please take the time to enter that number i...

Страница 3: ... have verified the control settings 15 Make necessary adjustments to the input sensitivity controls to obtain the right overall output and the desired balance in the system See Appendix B page 22 for the recommended input sensitivity setting method 16 Enjoy the fruits of your labor with your favorite music PRODUCT DESCRIPTION The JL Audio 450 4v2 is a four channel system BNQMJGJFS VUJMJ JOH QBUFOU...

Страница 4: ...tagew TXJUDI TFMFDUT BO input sensitivity range between 800mV and 8V This is useful for certain high output preamp level signals as well as speaker level output from source units and small amplifiers To use speaker level sources splice the speaker output wires of the source unit or small amplifier onto a pair of RCA plugs for each input pair or use the JL Audio ECS Speaker Wire to RCA adaptor XB C...

Страница 5: ... right this switch multiplies the cutoff frequency TFMFDUFE CZ UIF SPUBSZ iFilter Freq Hz w DPOUSPM CZ B GBDUPS PG O UIF ix1w QPTJUJPO UIF SBOHF PG UIF SPUBSZ DPOUSPM JT BT NBSLFE O UIF ix10w QPTJUJPO UIF SBOHF PG UIF SPUBSZ DPOUSPM JT L IMPORTANT The output of the amplifier will decrease for a given input voltage when the Input Range switch is placed in the High position Conversely the output wil...

Страница 6: ...ut Re Ba Ba O ction Bridged 300W x 1 3 8Ω Left Right 150W 1 5 4Ω 150W CH 1 2 Speaker Outputs 3 iFilter Freq Hz w 5IF GJMUFS GSFRVFODZ markings surrounding this rotary control are for reference purposes and are generally accurate to within 1 3 octave or better If you would like to select the filter cutoff frequency with a higher level of precision consult the charts in Appendix A page 22 of this ma...

Страница 7: ...fiers requires specifically USBJOFE TFSWJDF QFSTPOOFM P OPU BUUFNQU to service the amplifier yourself or through VOBVUIPSJ FE SFQBJS GBDJMJUJFT 5IJT XJMM OPU POMZ 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 technical support ...

Страница 8: ...s option the user has the ability to fade the level of the subwoofer amplifier s input relative to the HF channels but cannot control front to rear fading of the HF channels The relative level of the front and rear HF channels will be fixed by the 450 4v2 s iInput Sens w TFUUJOHT BOE XJMM OPU CF VTFS adjustable from the front of the vehicle SYSTEM CONFIGURATIONS The 450 4v2 is a very flexible ampl...

Страница 9: ...r with front and rear pairs of stereo outputs Input Connections one stereo pair of source unit outputs is connected to the CH 1 2 JOQVUT PG UIF W TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1 2 Input Sectionw 5IF TFDPOE TUFSFP QBJS PG TPVSDF unit outputs is connected to the CH 3 4 inputs of the 450 4v2 Connect the subwoofer amplifier inputs to the preamp outputs of the W 4FMFDU iALLw PO UIF...

Страница 10: ...center speaker system This is not as desirable as a true center channel from a multi channel source but it can be used to create a convincing sound stage in some applications B Summed Center Channel No User Adjustability Required a basic source unit or processor with left and right stereo outputs Input Connections a single pair of stereo source unit outputs connected to the CH 1 2 JOQVUT PG UIF W ...

Страница 11: ...subwoofer amplifier owner s manual for proper adjustments TRI AMPLIFIED SYSTEMS Tri amplified systems are defined as systems in which separate amplifier channels drive low frequency LF mid frequency MF and high frequency HF speakers and are separately filtered to send appropriate frequency ranges to each speaker system The most common application of tri amplification in mobile audio is to drive a ...

Страница 12: ...m Impedance CHANNELS 1 2 CHANNELS 3 4 Stereo Bridged Stereo Bridged 8Ω 24 5 V 49 0 V 17 3 V 34 6 V 6Ω 24 5 V 42 4 V 17 3 V 30 0 V 4Ω 24 5 V 34 6 V 17 3 V 24 5 V 3Ω 21 2 V 30 0 V 15 0 V 21 2 V 2Ω 17 3 V not recommended 12 2 V not recommended 1 5Ω 15 0 V not recommended 10 6 V not recommended APPENDIX A Precise Frequency Selection Chart FILTER FREQ CH 1 2 CH 3 4 Detent Panel Actual Number Marking Fr...

Страница 13: ...nnection with the metal inside the terminal block The speaker wire connectors are designed to accept up to 8 AWG wire Make sure to strip the wire to allow for a sufficient connection with the metal inside the terminal block How do I properly set the input sensitivity on my amplifier Please refer to Appendix B page 22 to set the input sensitivity for maximum low distortion output My amplifier doesn...

Страница 14: ...quency to operate as a bandpass filter for tri amp configurations Defeatable LF Boost Single band fixed frequency 48 Hz fixed Q 6 dB boost Defeatable Port for optional remote bass control to provide variable boost control from 0 to 15 dB Infrasonic Filter 24 dB octave 30Hz defeatable Channels 3 4 Amplifier Topology Class A B with patented Absolute Symmetry dual N Channel MOSFET output design Power...

Страница 15: ... Input Mode 2ch 4ch Filter Type LP BP HP x1 x10 Low High Input Voltage Low High High Pass Filter Off 12dB 24dB Freq Range Filter Mode Slope x1 x10 Off 12dB 24dB Infrasonic Filter Off 30Hz Bass EQ Off On Signal From 1 2 3 4 All 50 60 75 95 130 200 500 50 60 75 95 130 200 500 Filter Freq Hz 450 4v2 Four Channel System Amplifier Preamp Output Section 1 2 Inputs Only Either feature sums the CH 1 2 inp...

Страница 16: ...30 JL Audio 450 4v2 Owner s Manual 31 NOTES NOTES ...

Страница 17: ...lied warranties therefore these exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state If you need service on your JL AUDIO product MM XBSSBOUZ SFUVSOT TIPVME CF TFOU UP 6 0 T NQMJGJFS 4FSWJDF BDJMJUZ GSFJHIU QSFQBJE UISPVHI BO BVUIPSJ FE 6 0 EFBMFS BOE NVTU CF BDDPNQBOJFE CZ QSPPG PG QVSDIBTF B DPQZ PG UIF PS...

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