JL Audio 450/4V2 owner manual Preamp Output Section, Speaker Outputs

3)

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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 manual.

Preamp Output Section

The 450/4v2 incorporates a pass-through preamp output section, so that additional amplifiers can be added to the system. This pass- through pre-amp output can be configured three

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The Preamp Output signal is not affected by

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selected for the amplifier or by any crossover filter selected (if the input signal is full-range, the preamp output will be full-range). When the 450/4v2 is being used to drive front and rear speaker systems, this preamp output mode will deliver a summed front/rear signal to the subwoofer amplifier, while permitting fading of the front and rear speaker systems from the source unit.

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

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designed to conserve amplifier power and protect subwoofer systems without audibly degrading the sub-bass output. 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. The infrasonic filter can be completely defeated

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signal from flowing through the circuit.

SPEAKER OUTPUTS

The 450/4v2 employs JL Audio’s exclusive Regulated, Intelligent Power Supply (R.I.P.S.) design. The operation of the R.I.P.S. system is independent for each pair of channels. This sophisticated power supply allows the amplifier to produce its optimum power (150 watts x 2 for channels 1&2 and 75 watts x 2 for channels 3&4) over a wide range of speaker impedances.

Unlike conventional amplifiers that require a specific impedance to produce optimum power, the R.I.P.S.-equipped 450/4v2 gives you the freedom to use a variety of speaker configurations that achieve final nominal impedances between 1.5 – 4Ω per channel in stereo (without sacrificing power output or sound quality). When bridged, each channel

Preamp Output Section

CH 1

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Signal From

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is always low level regardless of the voltage

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

applied to this amplifier’s inputs and the

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entirely automatic and adjusts itself every time

1 & 2 3 & 4 All

setting chosen on this amplifier’s “Input

the amplifier is turned on according to the

1

Range” switch. A JL Audio amplifier receiving

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lowest impedance present at the speaker load.

signal from this preamp output should have

optional remote boost knob (sold separately,

There are no user controls to configure. The

Left Output Right Output

B

its “Input Range” switch set to “Low”.

JL Audio Model RBC-1) that can be mounted

system operates through multiple stages of

in the front of the vehicle. With the RBC-1

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CH 1 & 2 Bass Control

connected, the boost is no longer limited to 0

most appropriate to the actual impedance of the

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This section provides two basic bass processing

or +6 dB, allowing a range of 0-15 dB of boost

speakers you connect to it.

signal that is connected to the 450/4v2’s

tools for CH 1&2: a 24 dB/octave infrasonic filter

to be selected.

ction

CH 1 & 2 Speaker Outputs

CH

CH 1&2 Inputs. This mode is useful for

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feeding a subwoofer amplifier when the

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450/4v2 is being used to drive front and rear

sums the CH 1&2 input signals to mono. (These

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I M P O RTA N T

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The “Bass EQ” and “Infrasonic Filter” features

speaker systems. This preamp output mode

features should only be used when driving

will track the signal level of CH 1&2, allowing

subwoofer(s) from CH 1&2).

will only operate when the CH 1&2 filter is

Left

Right

fading of the rear channels without affecting

activated and in low-pass mode. If you are

150W

(1.5-4Ω) 150W

uts

CH 1 & 2 Bass Control

CH 1

utput

Bridged: 300W x 1 (3-8Ω)

Re

the subwoofer level.

using an external active crossover and would

Ba

Bass EQ

Infrasonic Filter

Freq.

like to use the “Bass EQ” and “Infrasonic

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Off On

Off 30Hz

x1

Filter” features, set the “Filter Mode/Slope”

signal that is connected to the 450/4v2’s CH

Either

75

switch on “12dB” and rotate the frequency

sums the

feature

3&4 Inputs. This mode is useful for feeding a

CH 1&2 input

60

selection knob fully clockwise to the “500 Hz”

mono when

50

signals to

subwoofer amplifier when the 450/4v2 is being

activated.

position. This will activate the bass controls

Remote

Filter F

used to drive front and rear speaker systems.

Bass Port

without significantly affecting the crossover

This preamp output mode will track the signal

point selected by the external active crossover.

level of CH 3&4, allowing fading of the front

channels without affecting the subwoofer level.

10 JL Audio - 450/4v2 Owner’s Manual 11