Bedienungsanleitung JL Audio GMAX (Seite 7 von 11) (Englisch)

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APPENDIX B:

Precise Frequency Selection Chart

“FILTER FREQ” AMP FILTER

Detent Panel Actual

Number Marking Freq.

Full counter-clockwise: 42

01 ............................42

02 ............................42

03 ............................42

04 ........... “40” ............42

05 ............................43

06 ............................44

07 ............................46

08 ............“45” ............47

09 ............................49

10 ............................50

11 .............................52

12 ............................53

13 ............................55

14 ........... “55” ............57

15 ............................58

16 ............................60

17 ............................63

18 ............................65

19 ........... “65” ............67

20 ............................70

21 ............................73

22 ............................76

23 ............................79

24 ...........“80” . . . . . . . . . . . .83

25 ............................87

26 ............................92

27 ............................96

28 ...........................102

29 ...........“100”...........108

30 ...........................114

31 ...........................122

32 ...........................131

33 ...........................143

34 ...........................157

35 ...........................184

36 ...........“200” ..........193

37 ...........................198

38 ...........................198

39 ...........................198

Full-clockwise: 198

APPENDIX C:

G-MAX Specifications

General Specifications:

Recommended Fuse Value: 80A

Recommended Fuse Type: AFS, ANL or MaxiFuse™

Input Sections:

No. of Inputs: One Stereo Pair

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 patented discrete drive circuitry

Power Supply: Unregulated MOSFET switching type

Rated Power at 14.4 V with less than

1% THD+Noise (20-250 Hz):

600W RMS x 1 @ 4 ohms, 1200W RMS x 1 @ 2 ohms

Rated Power @ 12.5V with less than

1% THD + Noise (20-250 Hz):

450W RMS x 1 @ 4 ohms, 900W RMS x 1 @ 2 ohms

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

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

Frequency Response: 10 - 250 Hz (+0, -1 dB)

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

ohms/50 Hz

Amplifier Filter:

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:

Buffered pass-through type.

Dimensions(LxWxH):

15.75" x 9.25" x 2.50" (400mm x 235mm x 63.5mm)

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 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). 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 G-MAX).

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 G-MAX) 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 G-MAX 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.” 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.

Nom. Impedance Target AC Voltage

4 49.0 V

3 49.0 V

2 49.0 V

Due to ongoing product development, all specifications are subject to

change without notice.

12 JL AUDIO G-MAX JL AUDIO G-MAX 13

JL Audio GMAX Seite 7

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