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
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
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 G4500).
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 G4500) 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
8)Increase the “Input Sens.” control until the target voltage is observed with the voltmeter.
9)Once you have adjusted the G4500 to its maximum
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
“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
Nom. | Target AC Voltage | |
Impedance | Stereo | Bridged |
| ||
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8Ω | 17..8 V | 26..8 V |
6Ω | 17..8 V | 25..6 V |
4Ω | 17..8 V | 24..6 V |
3Ω | 17..3 V | not recommended |
2Ω | 15..8 V | not recommended |
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Appendix B:
Precise Frequency Selection Chart
“Filter FREQ” AMP Filter
Detent Panel Actual
Number Marking Freq.
Full
01 . | . . . . . . . . . . . . . . . . . | 53 |
02 . | . . . . . . “50” | .53. . . . |
03 . | . . . . . . . . . . . . . . . . . | 53 |
04 . | . . . . . . . . . . . . . . . . . | 54 |
05 . | . . . . . . . . . . . . . . . . . | 54 |
06 . | . . . . . . . . . . . . . . . . . | 55 |
07 . | . . . . . . . . . . . . . . . . . | 55 |
08 . | . . . . . . “55” | .56. . . . |
09 . | . . . . . . . . . . . . . . . . . | 56 |
10 . | . . . . . . . . . . . . . . . . . | 57 |
11 . | . . . . . . . . . . . . . . . . . | 58 |
12 . | . . . . . . . . . . . . . . . . . | 59 |
13 . | . . . . . . . . . . . . . . . . . | 62 |
14 . | . . . . . . “60” | .65. . . . |
15 . | . . . . . . . . . . . . . . . . . | 65 |
16 . | . . . . . . . . . . . . . . . . . | 66 |
17 . | . . . . . . . . . . . . . . . . . | 70 |
18 . | . . . . . . . . . . . . . . . . . | 73 |
19 . | . . . . . . . . . . . . . . . . . | 77 |
20 . | . . . . . . “80” | .81. . . . |
21 . | . . . . . . . . . . . . . . . . . | 84 |
22 . | . . . . . . . . . . . . . . . . . | 88 |
23 . | . . . . . . . . . . . . . . . . . | 94 |
24 . | . . . . . . . . . . . . . . . . . | 101 |
25 . | . . . . . . . . . . . . . . . . . | 104 |
26 . | . . . . . .“120”. . . . . . . . . 115. . . . | |
27 . | . . . . . . . . . . . . . . . . . | 118 |
28 . | . . . . . . . . . . . . . . . . . | 128 |
29 . | . . . . . . . . . . . . . . . . . | 137 |
30 . | . . . . . . . . . . . . . . . . . | 146 |
31 . | . . . . . . . . . . . . . . . . . | 164 |
32 . | . . . . . .“150”. . . . . . . . . 177. . . . | |
33 . | . . . . . . . . . . . . . . . . . | 193 |
34 . | . . . . . . . . . . . . . . . . . | 197 |
35 . | . . . . . . . . . . . . . . . . . | 209 |
36 . | . . . . . . . . . . . . . . . . . | 213 |
37 . | . . . . . . . . . . . . . . . . . | 216 |
38 . | . . . . . .“200”. . . . . . . . . 218. . . . | |
39 . | . . . . . . . . . . . . . . . . . | 225 |
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Appendix C:
G4500 Specifications
General Specifications:
Recommended Fuse Value: 50A
Recommended Fuse Type: AFS, AGU or MaxiFuse™
Input Sections:
No. of Inputs: Two Stereo Pairs
Input Type:
Input Range: Switchable from 200mV - 2V RMS to 800mV - 8V RMS
Amplifier Section:
Amplifier Topology: Class A/B with patented Absolute Symmetry™ dual
1% THD+Noise (20Hz - 20 kHz) Stereo, all channels driven:
80W RMS x 4 @ 4 ohms, 125W RMS x 4 @ 2 ohms Bridged, all channels driven:
160W RMS x 2 @ 8 ohms, 250W RMS x 2 @ 4 ohms Rated Power @ 12.5V with less than
1% THD + Noise (20Hz - 20 kHz) Stereo, all channels driven:
60W RMS x 4 @ 4 ohms, 90W RMS x 4 @ 2 ohms Rated Power Bridged, all channels driven:
120W RMS x 2 @ 8 ohms, 180W RMS x 2 @ 4 ohms Signal to Noise Ratio: >104 dB referred to rated power
Slew Rate: ± 22V/µs
Amplifier Filter:
Filter Type:
Configurable as
Preamp Output:
Dimensions(LxWxH):
13.8" x 9.25" x 2.50" (350mm x 235mm x 63.5mm)
Due to ongoing product development, all specifications are subject to change without notice..
14 | JL AUDIO G4500 | JL AUDIO G4500 | 15 |