JL Audio 500/1v2 owner manual Turn-On Options, Amplifier Input Section

Turn-On Options

!

IMPORTANT

2) Signal Sensing Turn-On Method: A valuable

You cannot use the turn-on output to turn on

The 500/1v2 can be turned on and off using

The amplifier will operate with only one input

two different methods:

feature of the 500/1v2 is its ability to be turned

processors that are in the signal path before the

connection (left or right), but will require an

on and off by the presence or lack of signal at

500/1v2. (Signal will not pass through most

increase in input sensitivity to overcome the loss

1) A conventional +12V remote turn-on lead.

its audio inputs. This allows you to operate the

processors when they are not powered up,

of signal. If a mono input signal is to be run, we

2) A signal sensing turn-on circuit.

amplifier without having to locate a remote

meaning that the amplifier will not turn on

recommend that you use a “Y-adaptor” like the

turn-on lead at the source unit. This can be

until that processor is active).

JL Audio ECS model XB-CLRAICY-1F2M to split

very useful if interfacing the amplifier with

the mono signal into both inputs of the amplifier.

+12VDC Ground Remote

some OEM source units that do not have

AMPLIFIER Input Section

conventional turn-on leads.

The 500/1v2 employs a differential-balanced

2) Input Voltage Range: A wide range of

input topology that provides the user with a high

signal input voltages can be accommodated

degree of input flexibility while retaining superior

by the 500/1v2’s input section (200mV – 8V).

500/1v2

!

IMPORTANT

noise rejection. This type of circuit also allows

This wide range is split up into two sub-

Monoblock Subwoofer Amplifier

The sensitivity of the signal sensing turn-on

the 500/1v2 to accept high-voltage inputs from

ranges, accessible via switches located in the

circuit has been designed for high-level

factory source unit outputs without excessive

“Amplifier Input Section” of the amplifier.

(speaker level) signals, not for low-level

distortion or noise problems.

The “Low” position on the “Input Voltage”

To select between the two modes there is a

(preamp level) signals. Using this feature with

switch selects an input sensitivity range

switch, marked “Signal Sensing”, located in the

low-level (preamp level) signals is not

between 200mV and 2V. This means that

“Amplifier Input Section” of the front panel.

recommended. We do not recommend this

P Filter

Amplifier Input Section

S

the “Input Sens.” rotary control will operate

Slope

Input Voltage

Input Sens. Signal Sensing

method of turning the amplifier on and off as a

within that voltage window. If you are using

1) Conventional Remote Turn-On Method:

default. Whenever possible, use the

an aftermarket source unit, with conventional

B 24dB

Low High

Off On

uses a conventional +12V remote turn-on

conventional remote turn-on lead method. The

80

preamp-level outputs, this is most likely the

5

lead, typically controlled by the source unit’s

signal sensing circuit is designed to detect

100

MO

position that you will use. The “High” position

remote turn-on output. The amplifier will

midrange frequency signal presence. If the

200

on the “Input Voltage” switch selects an input

turn on when +12V is present at its “Remote”

signal feeding the amplifier is not full-range

eq. (Hz)

Left Ch.

Right Ch.

sensitivity range between 800mV and 8V. This

input and turn off when +12V is switched

(for example, if there is an active low-pass

is useful for certain high-output preamp level

off. If a source unit does not have a dedicated

crossover in line before the amplifier), this

signals as well as speaker-level output from

remote turn-on output, the amplifier’s turn-

circuit will not operate properly.

1) Input Connections: A standard left/right pair

source units and small amplifiers. To use

on lead can be connected to +12V via a switch

of RCA type jacks is used for input on

speaker-level sources, splice the speaker output

that derives power from an ignition-switched

To activate the signal sensing turn-on feature,

the 500/1v2. You may run a stereo or a mono

wires of the source unit or small amplifier

circuit. To use this method, select “Off” on

place the “Signal Sensing” switch in the “On”

signal into the inputs of the amplifier. The

onto a pair of RCA cables or plugs or use the

the “Signal Sensing” switch in the “Amplifier

position. This should only be done if there is

amplifier’s input section automatically sums

JL Audio ECS Speaker Wire to RCA adaptor

Input Section”. The 500/1v2’s “Remote”

no conventional turn-on lead connected to the

stereo signals to mono for the internal

(XB-CLRAIC2-SW).

turn-on connector is designed to accept 12

amplifier’s “Remote” connector. When in the

amplifier section and for the “LP” “Filter

AWG – 8 AWG wire. 12 AWG is more than

“On” position, the signal sensing circuit will

Mode” of the “Preamp Output” section.

!

IMPORTANT

adequate for this purpose. To connect the

monitor the audio input signal and turn the

The output of the amplifier will decrease

remote turn-on wire to the amplifier, first back

amplifier on when signal is present. After about

!

IMPORTANT

out the set screw on the top of the amplifier,

25 seconds of no signal, the amplifier will shut off.

for a given input voltage when the “Input

using the supplied hex wrench. Strip 1/2

Turning on other amplifiers in signal sensing

If you plan to use the “Preamp Output” in

Range” switch is placed in the “High” position.

inch (12mm) of wire and insert the bare wire

mode: When the signal sensing circuit is turned

“Full-Range” or “HP” mode to feed a stereo

Conversely, the output will be higher with

into the receptacle on the front panel of the

on, the “Remote” Connector on the amplifier

amplifier, you must connect a stereo signal to

the switch in the “Low” position. While this

amplifier, seating it firmly so that no bare wire

may be used as a remote turn-on source for other

the input of the amplifier. A mono signal into

may sound counter-intuitive, it is correct

is exposed. Smaller wire than 12 AWG can be

amplifiers in the system. +12V will be present

the amplifier will result in a mono signal out of

as described.

used, but it may be necessary to strip 1 inch

at the connector when the amplifier turns on in

the preamp output. (It’s a great amplifier, but it

of insulation from the wire and fold the bare

signal sensing mode and will not be present when

doesn’t do magic).

wire in half prior to insertion. While holding

the amplifier turns off.

the wire in the terminal, 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.

6 JL Audio - 500/1v2 Owner’s Manual 7