APPENDIX A:
Precise Frequency Selection Chart
“FILTER FREQ” AMP FILTER
Detent Panel Actual
Number Marking Freq.
Full counter-clockwise: 58
01 . . . . . . . . . . . . . . . . . . . . . . . .58 02 . . . . . . . . .“50” . . . . . . . . .58 03 . . . . . . . . . . . . . . . . . . . . . . . .58 04 . . . . . . . . . . . . . . . . . . . . . . . .58 05 . . . . . . . . . . . . . . . . . . . . . . . .59 06 . . . . . . . . . . . . . . . . . . . . . . . .60 07 . . . . . . . . . . . . . . . . . . . . . . . .61 08 . . . . . . . . .“60” . . . . . . . . .63 09 . . . . . . . . . . . . . . . . . . . . . . . .65 10 . . . . . . . . . . . . . . . . . . . . . . . .67 11 . . . . . . . . . . . . . . . . . . . . . . . .69 12 . . . . . . . . . . . . . . . . . . . . . . . .71 13 . . . . . . . . . . . . . . . . . . . . . . . .74 14 . . . . . . . . .“75” . . . . . . . . .77 15 . . . . . . . . . . . . . . . . . . . . . . . .80 16 . . . . . . . . . . . . . . . . . . . . . . . .82 17 . . . . . . . . . . . . . . . . . . . . . . . .85 18 . . . . . . . . . . . . . . . . . . . . . . . .90 19 . . . . . . . . . . . . . . . . . . . . . . . .93 20 . . . . . . . . .“95” . . . . . . . . .97 21 . . . . . . . . . . . . . . . . . . . . . . .102 22 . . . . . . . . . . . . . . . . . . . . . . .107 23 . . . . . . . . . . . . . . . . . . . . . . .113 24 . . . . . . . . . . . . . . . . . . . . . . .120 25 . . . . . . . . . . . . . . . . . . . . . . .127 26 . . . . . . . . .“130” . . . . . . . .135 27 . . . . . . . . . . . . . . . . . . . . . . .143 28 . . . . . . . . . . . . . . . . . . . . . . .153 29 . . . . . . . . . . . . . . . . . . . . . . .171 30 . . . . . . . . . . . . . . . . . . . . . . .182 31 . . . . . . . . . . . . . . . . . . . . . . .201 32 . . . . . . . . .“200” . . . . . . . .223 33 . . . . . . . . . . . . . . . . . . . . . . .253 34 . . . . . . . . . . . . . . . . . . . . . . .289 35 . . . . . . . . . . . . . . . . . . . . . . .337 36 . . . . . . . . . . . . . . . . . . . . . . .404 37 . . . . . . . . . . . . . . . . . . . . . . .474 38 . . . . . . . . .“500” . . . . . . . .514 39 . . . . . . . . . . . . . . . . . . . . . . .525
Full-clockwise: 542
APPENDIX B:
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 (3 - 8Ω bridged) and when connected to a charging system with any voltage from 11 - 14.5V. 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 impedances and 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). 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 Outputs”connectors.
2)Turn off all processing on the source unit (bass/treble, loudness, EQ, etc.). Set fader control to center position and subwoofer level control to 3/4 of maximum (if used to feed the 300/2).
3)Switch the “Input Voltage” 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 below, 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 300/2) at 3/4 source unit volume.
7)Connect the AC voltmeter to the “Speaker Outputs” 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 R–).
8)Increase the “Input Sens.” control until the target voltage is observed with the voltmeter. If excessive voltage is read with the control at minimum (full counterclockwise), switch the “Input Voltage” switch to “High” and re-adjust.
9)Once you have adjusted the 300/2 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.
!
I M P O RTA N T
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, including source unit tone controls or EQ circuits. EQ cuts will not require re-adjustment.
Nom. | Target AC Voltage |
Impedance | Stereo | Bridged |
8Ω | 24.5 V | 49.0 V |
6Ω | 24.5 V | 42.4 V |
4Ω | 24.5 V | 34.6 V |
3Ω | 21.2 V | 30.0 V |
2Ω | 17.3 V | not recommended |
1.5Ω | 15.0 V | not recommended |