Manual JL Audio 1200 (page 8 of 13) (English)

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

APPENDIX B:

1200/1v3 Specifications

General Specifications:

Recommended Fuse Value: 100A

Recommended Fuse Type: ANL or MaxiFuse™

Input Section:

Input Type: Differential-balanced with RCA jack inputs

Input Range: Switchable from 200mV - 2V RMS to

800mV - 8V RMS

Amplifier Section:

Amplifier Topology: H-Bridge, Class D Mono

with impedance optimization and patented

discrete drive circuitry

Power Supply: Pulse width modulation-regulated

switching power supply

Rated Power: 1200W RMS x 1 @ 1.5 - 4Ω (11 - 14.5V)

THD at Rated Power: <0.05% @ 4Ω, 50 Hz

Signal to Noise Ratio: >95 dB referred to rated power

(A-weighted, 20 Hz - 20 kHz noise bandwidth)

Frequency Response: 5 - 250 Hz (+0, -3 dB)

Damping Factor: >500 @ 4Ω/50 Hz, >250 @ 2Ω/50 Hz

Crossover Section:

Amplifier Low-Pass Filter: State-variable, 12 dB/octave

Butterworth or 24 dB/octave Linkwitz-Riley with

continuously variable cutoff frequency selection

from 40 - 200 Hz, defeatable

Preamp Output:

2-Channel, with fully independent, state-variable,

12 dB/octave Butterworth or 24 dB/octave Linkwitz-Riley

filter with continuously variable cutoff frequency selection

from 40 - 200 Hz, defeatable

Advanced Bass Control Section:

Parametric EQ: Single-band, fully parametric equalizer

with “Q” adjustment from 0.5 - 4.0, center frequency

adjustment from 20 - 80 Hz, boost adjustment from 0 to

+15 dB and port for optional remote bass boost control

(RBC-1), defeatable

Infrasonic Filter: Fully variable, 24 dB/octave Butterworth

high-pass filter, cutoff frequency adjustable from 15 - 60

Hz, defeatable

Dimensions (H x W x D):

2.36 in x 19.7 in x 9.25 in ( 60mm x 500mm x 235mm)

Nom. Impedance Target AC Voltage

4 (or higher)

64.3V

3

60.0V

2

49.0V

1.5

42.4V

APPENDIX A:

Input Sensitivity Level Setting

JL Audio amplifiers utilizing the Regulated

Intelligent Power Supply (R.I.P.S.) allow

delivery of their rated power when connected

to any load impedance from 1.5 - 4Ω per

channel and when connected to a charging

system with any voltage from 11 - 14.5V. This

design is beneficial for many reasons. One of

these reasons is ease of setup. Because each

JL Audio amplifier will always deliver the

same amount of power within its operational

range of impedances and supply voltages, the

maximum, unclipped output is very predictable.

This makes setting the gain structure via the

input sensitivity controls very simple. Following

the directions below will allow the user to adjust

the input sensitivity of the amplifier(s) simply

and easily in just a few minutes using equipment

which is commonly available in installation bays.

Necessary Equipment

• Digital AC Voltmeter

• CD with a sine-wave test tone recorded at

0 dB reference level in the frequency range

to be amplified for that set of channels

(50 Hz for subwoofer channels, 1 kHz for

a midrange application). The CleanSweep®

Calibration Disc contains the appropriate

test tones and is available for sale at

http://store.jlaudio.com Do not use attenuated

test tones (-10 dB, -20 dB, etc.).

The Nine-Step Procedure

1) Disconnect the speaker(s) from the

amplifier’s speaker output connectors.

2) Turn off all processing (bass/treble, loudness,

EQ, etc.) on the source unit, processors (if

used) and amplifier. Set fader control to center

position and subwoofer level control to 3/4 of

maximum (if used to feed the 1200/1v3).

3) Switch the “Input Voltage” switch to “Low”

and turn the “Input Sens.” control all the

way down.

4) Set the source unit volume to 3/4 of full

volume. This will allow for reasonable gain

overlap with moderate clipping at full volume.

5) Using the chart on this page, determine the target

voltage for input sensitivity adjustment according

to the nominal impedance of the speaker system

connected to the amplifier outputs.

6) Verify that you have disconnected the speakers

before proceeding. Play a track with an

appropriate sine wave (within the frequency

range to be amplified by the 1200/1v3) at 3/4

source unit volume.

7) Connect the AC voltmeter to the speaker output

connectors of the amplifier. If the channel

pair is operating in stereo, it is only necessary

to measure one channel. If bridged, make sure

you test the voltage at the correct connectors

(L+ and R–).

8) Increase the “Input Sens.” control until the

target voltage is observed with the voltmeter.

9) Once you have adjusted the 1200/1v3 to

its maximum low-distortion output level,

reconnect the speaker(s). The “Input Sens.”

control can now be adjusted downward if the

amplifier requires attenuation to achieve the

desired system balance.

IMPORTANT

Do not increase any “Input Sens.” setting

for any amplifier channel or channel

pair in the system beyond the maximum

level established during this procedure.

Doing so will result in audible distortion

and possible speaker damage.

It will be necessary to re-adjust the

“Input Sens.” for the affected channels if any

equalizer boost is activated after setting the

“Input Sens.” with this procedure. This applies

to any EQ boost circuit, including source unit

tone controls or EQ circuits. EQ cuts will not

require re-adjustment.

Due to ongoing product development, all specifications are subject to

change without notice.

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