JL Audio G1700 owner manual 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 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 G1700).

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 G1700) 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 G1700 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
4Ω	37..4 V
3Ω	37..4 V
2Ω	37..4 V

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:

G1700 Specifications

General Specifications:

Recommended Fuse Value: 50A

Recommended Fuse Type: AFS 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 @ 14.4V with less than

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

350W RMS x 1 @ 4 ohms, 700W RMS x 1 @ 2 ohms Rated Power at 12.5 V with less than

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

250W RMS x 1 @ 4 ohms, 500W RMS x 1 @ 2 ohms Signal to Noise Ratio: >90 dB referred to rated power (A-weighted, 20 Hz - 250 Hz 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):

11..81" x 9..25" x 2..50" (300mm x 235mm x 63..5mm)

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

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