JL Audio 505 6

BASS PROCESSING

IMPORTANT

the “12dB” or “24dB” position.These features will

If you connect a load higher than 4Ω nominal

will be full-range.) This signal is not affected by the

The 500/5's subwoofer channel control section

“LF Boost” or “Infrasonic Filter” processing

also includes some basic bass processing tools.

not work with the “Sub LP Filter” switch in the

per channel (or 8Ω in bridged mode for the front

selected for the amplifier. When the 500/5 is being

These consist of two primary components: a

“Off” position.This is to prevent cascading the

and rear channels), power will drop by half with

used to drive front, rear and subwoofer speaker

fixed-frequency, 24 dB / octave infrasonic filter and

processing of multiple amplifiers when configured in

every doubling of impedance above 4Ω stereo /

systems, this preamp output mode will deliver a

a fixed-frequency / “Q”, single-band equalizer

a master / slave arrangement. If you are using an

8Ω mono. If you connect a load lower than 1.5Ω

summed front/rear signal to an additional

centered at 48 Hz.

external active crossover and would like to use the

nominal per channel, the amplifier protection

subwoofer amplifier, while permitting fading of the

“LF Boost” and “Infrasonic Filter” features, set the

circuitry activates a “safe” mode which reduces

Subwoofer Channel

Control Section

front and rear speaker systems from the source

“Amp LP Filter” switch on “12dB” and rotate the

amplifier power to protect the circuitry from

Infrasonic Filter

Input From:

Input Voltage

Input Sens.

Sub LP Filter

unit.

frequency selection knob fully clockwise to the “200

failure (the yellow “Low Ω” LED lights to indicate

3) “Front”: This is a pass-through mode for the

Hz” position.This will activate the bass processing

that this has happened). See page 12 for details.

Off/30Hz

Ind./F+R/Front

Low/High

Off/12dB/24dB

preamp output, delivering the same signal that is

features without significantly affecting the crossover

Speaker loads below 1.5Ω nominal per channel

+10

being fed to the “Front Input Section” of the

+13

point selected by the external active crossover.

are not recommended and may cause the amplifier

amplifier (If the input signal is full-range, the preamp

Left

Right

output to distort excessively.

Remote Bass

SPEAKER OUTPUTS

output will be full-range.) This signal is not affected

LF Boost (dB)

Port

Independent Sub Input

Filter Freq. (Hz)

by the “LF Boost” or “Infrasonic Filter” processing

The 500/5 employs JL Audio's exclusive

IMPORTANT

1) “Infrasonic Filter”: The infrasonic filter is a

The rear channels of the 500/5 do not employ

selected for the amplifier.

Regulated, Intelligent Power Supply (R.I.P.S.) design

24 dB / octave high-pass filter, with a fixed cutoff

on its front and subwoofer channels.The operation

R.I.P.S. optimization and are designed to deliver rated

frequency of 30 Hz.This filter is designed to

of the R.I.P.S. system is independent for each pair of

power into loads between 3 and 4Ω per channel.

CAUTION

conserve amplifier power and protect subwoofer

channels.This sophisticated power supply allows the

Operating the rear channels below 3Ω may result in

If the “Output Mode” switch is in the “Sub LP”

systems without audibly degrading the sub-bass

amplifier to produce its optimum power (100 watts

excessive distortion and/or shutting down of these

position and the “Sub LP Filter” switch is in the

output.With ported enclosures, the use of the

x 2 for the front channels and 250 W x 1 for the

channels and is not recommended.

“Off” position, the preamp output will be a

infrasonic filter is highly recommended to protect

subwoofer channel over a wide range of speaker

12dB/octave low-pass with the “Bass Control”

the speaker(s) from excessive excursion below box

impedances. Unlike conventional amplifiers that

BRIDGING CONSIDERATIONS

processing added to it. THIS IS NOT A

tuning.With sealed enclosures, the use of the filter is

require a specific impedance to produce optimum

Bridging is the practice of combining the output

PREFERRED OPERATING MODE. DO NOT

less necessary, but can still help protect the speaker

power, the R.I.P.S.-equipped 500/5 gives you the

of two amplifier channels to drive a single load.

USE THIS MODE FOR MASTER / SLAVE

system.The infrasonic filter can be completely

freedom to use a variety of speaker configurations

When bridged, each channel produces signals of

CONFIGURATIONS.

defeated by selecting the “Off” position on the

that achieve final nominal impedances between 1.5

equal magnitude, but opposite polarity.The

Note:The signal level of the “Preamp Output” is

“Infrasonic Filter” switch.This bypasses all signal

– 4Ω per channel (without sacrificing power output

combined output of the two channels provides

affected by the setting of the “Input Voltage”

from flowing through the circuit.

or sound quality). When bridged, the front channel

twice the output voltage available from a single

switches (of the input section(s) chosen by the

2) LF (Low-frequency) Boost: This feature

pair will optimize output between 3 – 8Ω.The rear

channel.The 500/5 has been designed for bridging

“Signal From” switch). See the “Input Voltage

allows the user to control the boost of a fixed “Q”,

channel pair will optimize output between 6 - 8Ω.

of its front and rear channel pairs without the need

Range” section (page 6) for details on input voltage

fixed-frequency equalization band centered at 48

The operation of the R.I.P.S. circuitry is entirely

for input inversion adaptors.

settings.The preamp output level is not affected by

Hz.The “LF Boost” rotary control determines how

automatic and adjusts itself every time the amplifier

the “Input Sens.” rotary controls.

much boost (in dB) you are adding to the bass

is turned on according to the lowest impedance

IMPORTANT

signal. A range of

0-15 dB of boost is available. If no

present at the speaker load.There are no user

Operating bridged channel pairs into a load lower

boost is desired, rotate the “LF Boost” control fully

controls to configure.The system operates through

than 3Ω is not recommended.

counterclockwise.

multiple stages of impedance optimization, choosing

The “Remote Bass Port” allows the connection

the stage most appropriate to the actual impedance

tion

Front Speaker

Outputs

of an optional remote boost knob (the RBC-1)

of the speakers you connect to it.

t Sens.

that can be mounted in the front of the vehicle.

This optional control takes the place of the “LF

Subwoofer Output (250Wx1)

ilter

Freq.

Boost” knob on the amplifier when connected

and bypasses the “LF Boost” rotary control on

24dB

the amplifier.

ht Ch.

IMPORTANT

To bridge a pair of channels, use the “Left +” and

The “LF Boost” and “Infrasonic Filter” features

q. (Hz)

Filter

“Right –” speaker connectors only (the “Left –”

will only operate when the subwoofer channel's

and “Right +” remain unused).Then connect a

filter is activated with the “Sub LP Filter” switch in

mono signal to both left and right RCA inputs for

JL AUDIO 500/5