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JL Audio MHD900 Manual

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18 | JL Audio - MHD900/5-24V Owner’s Manual
APPENDIX B:
Precise Frequency Selection Chart
“FILTER FREQ”
Detent Panel Actual
Number Marking Freq. (Hz)
Full counter-clockwise: 53
01 ...........“50” ............53
02 ............................53
03 ............................53
04 ............................53
05 ............................54
06 ............................55
07 ............................57
08 ............................58
09 ...........“60” ............60
10 ............................62
11 ............................64
12 ............................66
13 ............................69
14 ............................71
15 ............................74
16 ............................77
17 ...........“80” ............80
18 ............................85
19 ............................86
20 .............. ..............90
21 ............................95
22 ...........................100
23 ...........................104
24 .............. .............110
25 .......“12 o’clock”.......116
26 ...........................123
27 ...........................131
28 ...........................141
29 ...........................151
30 ...........................165
31 ...........................180
32 ...........................200
33 ...........................224
34 ..........“250” ..........248
35 ...........................293
36 ...........................347
37 ...........................422
38 ...........................459
39 ..........“500” ..........504
40 ...........................508
41 ...........................508
Full-clockwise: 508
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 22 - 29V. 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 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.
… 18 …


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