JL Audio M600/1, MAN-01-2010 Appendix a, Necessary Equipment, Nine-Step Procedure, Input Sections

Appendix A:

Input Sensitivity Level Setting Following the directions below will allow the

installer to adjust the input sensitivity of each amplifier channel pair simply and easily in just a few minutes using equipment which is commonly available.

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). Do not use attenuated test tones (-10 dB, -20 dB, etc.).

The Nine-Step Procedure

1)Disconnect the subwoofer(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 M600/1).

3)Turn the amplifier’s “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 subwoofer system connected to the amplifier outputs.

6)Verify that you have disconnected the subwoofer(s) before proceeding. Play a track with an appropriate sine wave (within the frequency range to be amplified by the M600/1) at 3/4 source unit volume.

7)Connect the AC voltmeter to the speaker output connectors of the amplifier. Make sure you test the voltage at the correct connectors (+ and –).

8)Increase the “Input Sens.” control until the target voltage is observed with the voltmeter.

9)Once you have adjusted the M600/1 to its maximum low-distortion output level, reconnect the speaker(s). The “Input Sens.” controls can now be adjusted downward if the amplifier requires attenuation to achieve the desired system balance.

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.” 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.

Nom. Impedance	Target AC Voltage
4Ω	40..0 V
3Ω	37..3 V
2Ω	34..6 V
1Ω	Not Recommended

Appendix B: 

Precise Frequency Selection Chart

“Filter FREQ” AMP Filter

Detent Panel Actual

Number Marking Freq.

Full counter-clockwise: 53

01 .	. . . . . . . . . . . . . . . . .	53
02 .	. . . . . . “50”	.53. . . .
03 .	. . . . . . . . . . . . . . . . .	54
04 .	. . . . . . . . . . . . . . . . .	54
05 .	. . . . . . . . . . . . . . . . .	55
06 .	. . . . . . . . . . . . . . . . .	57
07 .	. . . . . . . . . . . . . . . . .	59
08 .	. . . . . . “60”	.61. . . .
09 .	. . . . . . . . . . . . . . . . .	63
10 .	. . . . . . . . . . . . . . . . .	65
11 .	. . . . . . . . . . . . . . . . .	67
12 .	. . . . . . . . . . . . . . . . .	70
13 .	. . . . . . . . . . . . . . . . .	72
14 .	. . . . . . . . . . . . . . . . .	75
15 .	. . . . . . . . . . . . . . . . .	78
16 .	. . . . . . “80”	.81. . . .
17 .	. . . . . . . . . . . . . . . . .	85
18 .	. . . . . . . . . . . . . . . . .	88
19 .	. . . . . . . . . . . . . . . . .	93
20 .	. . . .“12. . o’clock”	97. . .
21 .	. . . . . . . . . . . . . . . . .	102
22 .	. . . . . . . . . . . . . . . . .	107
23 .	. . . . . . . . . . . . . . . . .	113
24 .	. . . . . .“120”. . . . . . . . . 120. . . .
25 .	. . . . . . . . . . . . . . . . .	127
26 .	. . . . . . . . . . . . . . . . .	135
27 .	. . . . . . . . . . . . . . . . .	144
28 .	. . . . . . . . . . . . . . . . .	156
29 .	. . . . . . . . . . . . . . . . .	169
30 .	. . . . . . . . . . . . . . . . .	184
31 .	. . . . . . . . . . . . . . . . .	203
32 .	. . . . . .“200”. . . . . . . . . 227. . . .
33 .	. . . . . . . . . . . . . . . . .	254
34 .	. . . . . . . . . . . . . . . . .	290
35 .	. . . . . . . . . . . . . . . . .	337
36 .	. . . . . . . . . . . . . . . . .	392
37 .	. . . . . . . . . . . . . . . . .	426
38 .	. . . . . .“500”. . . . . . . . . 447. . . .
39 .	. . . . . . . . . . . . . . . . .	467
	Full-clockwise: 470

Appendix C:

M600/1 Specifications

General Specifications:

Recommended Fuse Value: 50A

Recommended Fuse Type: MAXI® or AGU

Input Sections:

No. of Inputs: One Stereo Pair

Input Type: Differential-balanced with RCA jack inputs

Input Range: 100mV - 4V RMS

Amplifier Section:

Amplifier Topology: NexD™ High Speed Class D

Power Supply: Unregulated MOSFET switching type

Rated Power at 14.4V with less than 1% THD+Noise (20Hz - 20 kHz)

400W RMS x 1 @ 4 ohms

600W RMS x 1 @ 2 ohms

Rated Power @ 12.5V with less than 1% THD + Noise (20Hz - 20 kHz)

300W RMS x 1 @ 4 ohms

500W RMS x 1 @ 2 ohms Signal to Noise Ratio:

>87 dB referred to rated power (A-weighted, 20 Hz-20 kHz noise bandwidth) >67 dB referred to 1W

(A-weighted, 20 Hz-20 kHz noise bandwidth) Frequency Response: 7 Hz - 500 Hz (+0, -1dB) Damping Factor:

>1000 @ 4 ohms / 50 Hz >500 @ 2 ohms / 50 Hz

Amplifier Filters:

Amplifier Low-Pass Filter:

State-variable, 12 dB/octave Butterworth or 24 dB/octave Linkwitz-Riley with continuously variable cutoff frequency selection from 50 - 500 Hz (defeatable)..

Infrasonic Filter:

24 dB/octave Butterworth @ 30 Hz (defeatable)..

Preamp Output:

Buffered pass-through type..

Dimensions(LxWxH):

8..52” x 7..09” x 2..05” (217mm x 180mm x 52mm)

Due to ongoing product development, all specifications are subject to change without notice..

12 JL Audio - M600/1 Owner’s Manual 13