Jl-audio HD600/4 User Manual download pdf (Page 10)

18 | JL Audio - HD600/4 Owner’s Manual

The Nine-Step Procedure

(follow this procedure for each pair of channels)

1) Disconnect the Speaker Connector Plugs.

2) Turn off all processing on the source unit

(bass/treble, loudness, EQ, etc.). Set fader

control to center position and subwoofer

level control to 3/4 of maximum (if

used to drive the HD600/4). Disconnect

the HD-RLC Remote Level Control

temporarily (if one is being used).

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

turn the “Input Sens.” control on both sets of

channels all the way down.

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

volume. If either set of channels is being

driven by a source unit’s dedicated subwoofer

output, also adjust the source unit’s subwoofer

level control to 3/4 of maximum output. This

will allow for reasonable gain overlap with

moderate clipping at full volume.

5) Using the chart below, determine the

target voltage for input sensitivity

adjustment according to the nominal

impedance of the speaker system

connected to each set of outputs.

6) Verify that you have disconnected the Speaker

Connector Plugs before proceeding. Play a

track with an appropriate sine wave (within the

frequency range to be amplified by each set of

channels) at 3/4 source unit volume.

7) Connect the AC voltmeter to the “Front

Speaker Outputs” or “Rear Speaker Outputs”

connectors of the amplifier. If the channel pair

is operating in stereo, it is only necessary to

measure one channel in the pair. 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 delivered for that set

of channels. If excessive voltage is read

on either set of channels with the control

at minimum (full counterclockwise),

switch the appropriate “Input Voltage”

switch to “High” and re-adjust.

9) Once you have adjusted each set of channels to

its maximum unclipped output level, reconnect

the speaker(s). The “Input Sens.” controls can

now be adjusted downward if either or both

sets of channels requires attenuation to achieve

the desired system balance.

Nom.

Impedance

FRONT CHANNELS REAR CHANNELS

Stereo Bridged Stereo Bridged

8 24.5 V 49.0 V 24.5 V 49.0 V

6 24.5 V 42.4 V 24.5 V 42.4 V

4 24.5 V 34.6 V 24.5 V 34.6 V

3 21.2 V 30.0 V 21.2 V 30.0 V

2 17.3 V

not recommended

17.3 V

not recommended

1.5 15.0 V

not recommended

15.0 V

not recommended

APPENDIX B:

Precise Frequency Selection Chart

“FILTER FREQ”

Detent Panel Actual

Number Marking Freq.

Full counter-clockwise: 53

01 ...........“50” ............53

02 ............................53

03 ............................53

04 ............................53

05 ............................54

06 ............................56

07 ............................58

08 ...........“60” ............60

09 ............................62

10 ............................64

11 ............................66

12 ............................68

13 ............................71

14 ............................74

15 ............................76

16 ...........“80” ............80

17 ............................83

18 ............................87

19 ............................91

20 .............. ..............94

21 ............................99

22 ...........................104

23 ...........................109

24 .......“12 o’clock” .......115

25 ...........................121

26 ...........................128

27 ...........................137

28 ...........................147

29 ...........................160

30 ...........................174

31 ...........................191

32 ...........................211

33 .......... “250” ..........236

34 ...........................269

35 ...........................309

36 ...........................369

37 ...........................443

38 .......... “500” ..........484

39 ...........................525

Full-clockwise: 528

APPENDIX C:

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.).

Do not increase any “Input Sens.” setting 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, source unit tone controls or EQ

circuits. EQ cuts will not require re-adjustment.

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OWNER’S MANUAL 1
INSTALLATION NOTES: 12

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Jl-audio HD600/4 User Manual Page 10

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