Manual JL Audio 1v3 (page 6 of 13) (English)

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10 | JL Audio - 1200/1v3 Owner’s Manual

select the filter frequency with a higher level

of precision, consult Appendix C: Chart A-4

(page 17) of this manual. The “Boost” control

determines how much boost (in dB) you are

adding to the bass signal. A range of 0 - 15dB

of boost is available. The “Remote Bass Port”

allows the connection of an optional remote

boost knob (the RBC-1) that can be mounted

in the front of the vehicle. This optional control

takes the place of the “Boost” knob on the

amplifier when connected and bypasses the

“Boost” control on the amplifier.

IMPORTANT

The “Advanced Bass Control” section will only

operate when the amplifier’s filter is activated

with the “Amp LP Filter” switch in the “12dB”

or “24dB” position. It will not work with this

switch in the “Off” position. This is to prevent

cascading the processing of multiple amplifiers

when configured in a master/Slave arrangement

as shown in Appendix D (page 18). If you are

using an external active crossover and would

like to use the “Advanced Bass Control”

features, set the “Amp LP Filter” switch on

“12dB” and rotate the frequency selection knob

fully clockwise to the “200 Hz” position. This

will activate the “LF Boost” and “Infrasonic

Filter” controls without significantly affecting

the crossover point selected by the external

active crossover.

SUBWOOFER OUTPUT

The 1200/1v3 employs JLAudio’s exclusive

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

design. This sophisticated power supply

allows the amplifier to produce its optimum

power (1200 watts x 1) over a wide range of

speaker impedances.

+12VDC Ground Remote

Low/High

Unlike conventional amplifiers that require

a specific impedance to produce optimum

power, the R.I.P.S.-equipped 1200/1v3 gives

you the freedom to use a variety of subwoofer

configurations that achieve final nominal

impedances between

1.5 – 4Ω (without sacrificing power output or

sound quality).

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

entirely automatic and adjusts itself every time

the amplifier is turned on according to the lowest

impedance present at the speaker load. There are

no user controls to configure. The system

operates through multiple stages of impedance

optimization, choosing the stage most appropriate

to the actual impedance of the speaker(s) you

connect to it.

IMPORTANT

If you connect a load higher than 4Ω nominal

to the 1200/1v3, power will drop by half with

every doubling of impedance above 4Ω. If you

connect a load lower than 1.5Ω nominal to the

1200/1v3, the amplifier protection circuitry

activates a “safe” mode which reduces amplifier

power to protect the circuitry from failure (the

yellow LED on the top of the amplifier will

light to indicate that this has happened). See

page 12 for details.

3) “Out Filter”: The preamp output is filtered by a

fully variable, active filter incorporated into the

output section and is not affected by the bass

control processing selected for the amplifier.

In “Out Filter” mode, the user can select:

a) High-pass (“HP”) or low-pass (“LP”)

filtering by way of the “Filter Mode” switch.

b) 12 dB/octave or 24 dB/ octave filter slope by

way of the “Filter Slope” switch.

c) A filter cutoff frequency between 40 - 200

Hz for the preamp output signal by way of

the “Filter Control” switch.

This is completely independent of the

amplifier’s internal filter and allows the user to

match, stagger or overlap the subwoofer low-pass

filter frequency of the amplifier crossover with

the output filter’s frequency for precise control

and optimized midbass performance.

If you would like to select the filter frequency

with a higher level of precision, consult

Appendix C: Chart A-2 (page 16) of this manual.

CAUTION

The signal level of the “Preamp Output” is

always low level regardless of the voltage

applied to this amplifier’s inputs and the

setting chosen on this amplifier’s “Input

Range” switch. All “Slave” amplifiers should

have their switches set to “Low”. See Appendix

D (page 18) for details.

ADVANCED BASS CONTROL SECTION

The 1200/1v3 includes a versatile bass

processing section consisting of two

primary components: a fully variable,

24 dB per octave infrasonic filter and a

parametric, single-band equalizer.

+12VDC Ground Remote

Low/High

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

24 dB/octave high-pass filter, with a fully

variable cutoff frequency between 15 - 60 Hz.

When set at frequencies lower than 30 Hz, it

conserves amplifier power without audibly

affecting the quality of the sub-bass output. If

set at frequencies higher that 30 Hz, there will

be an audible effect, but one which may be

desirable for SPL competition purposes or curve

shaping of a bottom-heavy system. With ported

enclosures, the use of the infrasonic filter is

highly recommended to protect the speaker(s)

from excessive excursion below box tuning.

With sealed enclosures, the use of the filter is

less necessary, but can still help protect the

speaker system. If you would like to select the

infrasonic filter frequency with a higher level of

precision, consult Appendix C: Chart A-3 (page

17) of this manual. The infrasonic filter can be

completely defeated by selecting the “Off”

position on the “Mode” switch. This bypasses

all signal from flowing through the circuit.

2) Parametric Bass Equalizer: The parametric

equalizer allows the user to select the center

frequency of the boost band as well as the

bandwidth (“Q”) of the boost band. The “Q”

control selects the bandwidth of the boost

around the center frequency. Lower numbers

pertain to wider bandwidths while higher

number pertain to narrower bandwidths.

The “Center Freq.” control selects the center

frequency of the boost bandwidth within

a range of 20 - 80 Hz. If you would like to

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JL Audio 1v3 Manual

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