JL Audio Slash 300/4v3 オーナーマニュアル

10  |  JL Audio - 300/4

v3

 Owner’s Manual  

11

The 300/4v3 is a flexible amplifier, well-suited 

for a multitude of system configurations. In 
this section, the most likely configurations are 
explained in detail.

Once you have selected your desired 

configuration, you can use the amplifier panel 
drawings on Page 22 to mark the required switch 
positions for easy reference. 

 

Bi-amplified systems are defined as systems 

in which separate amplifier channels drive low-
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and are separately filtered to send appropriate 
frequency ranges to each speaker system.

The most common application of  

bi-amplification in mobile audio is to drive a 
subwoofer system from one or more amplifiers or 
channels and component speakers from separate 
amplifiers or channels.

The 300/4v3 can be configured to drive a 

bi-amplified system by itself or with a separate 
subwoofer amplifier. 

In this configuration, the rear channels of the 

300/4v3 will drive subwoofers (stereo 75W x 2 or 
bridged 150W x 1) with low-pass filtering. The 
front channels will drive component speakers in 
stereo (75W x 2) with high-pass filtering. 

Input connection options for a bi-amplified system 
with one 300/4 v2 are as follows: 
 
A) No User Adjustability:
Req uired:  a basic source unit or processor with 

one pair of stereo outputs.

Inp ut  Connections: a single pair of stereo 

source unit outputs connected to the 
front channel inputs of the 300/4v3 
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from the front of the vehicle.

B) Fade Subwoofer Level vs. HF Level 
Req uired: a source unit or processor with front 

and rear pairs of outputs. 

Inp ut  Connections: the first stereo pair of source 

unit outputs is connected to the front inputs 
of the 300/4v3. The second stereo pair of 
source unit outputs is connected to the rear 
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Res ult: in this mode, the user has the ability to 

fade or control the level of the LF channels 
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unit’s fader control without exceeding the 
maximum clean output level set by each 
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C) Subwoofer Level Control Only 
Req uired: a source unit or processor with left, 

right and subwoofer outputs. 

Inp ut  Connections: the main stereo pair of 

source unit outputs is connected to the front 
inputs of the 300/4v3. The source unit’s 
dedicated subwoofer output is connected to 
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Res ult: in this mode, the user has the ability to 

control the absolute level of the LF channels 
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There are three status indicator lights on the 

top of the amplifier.  These are as follows: 
 
1)

iPowerw (Green): lights to indicate that the 

amplifier is turned on and operating normally.

 

iThermalw (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.

 

iLow Ωw (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 the amplifier. 
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). 

There is only one condition that will shut down 

an undamaged 300/4v3 completely… If battery 
voltage drops below 10 volts, the entire amplifier 
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on the top of the amplifier will 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 E (page 20).

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