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I M P O RTA N T
CROSSOVER CONTROLS | CH 3&4 Filter Section: |
The output of the amplifier will decrease for | Crossovers are groups of individual electronic | 2) iFilter Mode/Slopew$POUSPM5IJTTXJUDI |
| CH 3 & 4 Filter Section | CH | ||
a given input voltage when the “Input | filters which allow only certain frequency | allows you to defeat the CH 1&2 filter or select |
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| Freq. Range | Inpu | |||||
Range” switch is placed in the “High” | ranges to pass through them by attenuating | from two filter slopes. |
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position. Conversely, the output will be | frequencies outside the selected range. These |
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| x1 x10 | Off 12dB 24dB | Low | |
higher with the switch in the “Low” position. | filters allow the user to specify what frequency | iOffw%FGFBUTUIFGJMUFSGPS$)DPNQMFUFMZ | Mode | 95 | 130 |
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| Also sets |
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While this may sound | range will be sent out of each channel section | allowing the full range of frequencies present |
| 60 | 200 | cutoff for |
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| Bandpass |
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| CH 1 & 2 |
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correct as described. | of the amplifier. This, in turn, allows each | at the inputs to feed that pair of channels. | 4ch | 50 | 500 | Filter |
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1 & 2 |
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| (if selected) |
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| speaker system to only reproduce a range of | 5IJTJTVTFGVMGPSTZTUFNTVUJMJ[JOHPVUCPBSE | and HP Filter Freq. (Hz) |
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| 3 & 4 |
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3) Input Sensitivity Adjustment: Located next | frequencies it is | crossovers or requiring |
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UPUIFiInput VoltagewTXJUDIJOFBDIJOQVU | reduced distortion and improved fidelity. | from that pair of channels. |
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TFDUJPOJTBSPUBSZDPOUSPMMBCFMFEiInput |
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Sens.w0ODFUIFBQQSPQSJBUFiInput Voltagew | CH 1&2 Filter Section: | i 12dBw$POGJHVSFTUIFGJMUFSGPS$) | you to defeat the CH 3&4 filter or select from |
range has been selected, this control can be | trol | CH 1 & 2 Filter Section |
| to attenuate frequencies above or below the | |
used to match the source unit’s output voltage |
| selected filter frequency at a rate of 12 dB per | |||
c Filter | Freq. Range Filter Mode Slope | Input V | |||
to the input stage of each pair of amplifier |
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| octave (Butterworth alignment). |
channels for maximum clean output. Rotating | 0Hz | x1 x10 | Off 12dB 24dB | Low |
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the control clockwise will result in higher | e | 95 | 130 Filter Type |
| i 24dBw$POGJHVSFTUIFGJMUFSGPS$) |
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sensitivity (louder for a given input voltage). | he | 60 | 200 |
| to attenuate frequencies above or below the |
to |
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Rotating the control | hen | 50 | 500 LP BP HP |
| selected filter frequency at a rate of 24 dB per |
ed. |
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| Filter Freq. (Hz) | CH | |||
result in lower sensitivity (quieter for a given |
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input voltage). To properly set each pair |
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of amplifier channels for maximum clean | 1)iFilter | %FQFOEJOHPOUIFTQFBLFSTZTUFNBOE | |||
output, please refer to Appendix B (page 22) | iCH 1&2 Filter SectionwUIJTTXJUDIBMMPXT | the vehicle, different filter slopes may be | |||
in this manual. After using this procedure, | you to configure the CH 1&2 filter into one | required to produce a smooth transition | |||
you can then adjust the relative level of each | of three filter types: |
| between the sound of different speakers in the | ||
channel pair by adjusting the input sensitivity |
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| system. Experiment to find the slope which |
downward on either or both channel pairs, if | iLPw | best matches the acoustic requirements of | |||
they require attenuation to achieve the desired | filter to attenuate frequencies above | UIFTZTUFN5IFTIBSQFSi24dBwTFUUJOHXJMM | |||
TZTUFNCBMBODF%POPUJODSFBTFUIFiInput | the selected filter frequency. Useful | do a better job of protecting small speakers | |||
Sens.wTFUUJOHGPSBOZBNQMJGJFSJOUIFTZTUFN | for connection of subwoofer(s) to CH | with limited power handling. The shallower | |||
beyond the maximum level established during | 1&2 in a | i12dBwPDUBWFTFUUJOHBMMPXTUIFSFBSTQFBLFST | |||
the procedure outlined in Appendix B (page |
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| to reproduce more |
%PJOHTPXJMMSFTVMUJOBVEJCMFEJTUPSUJPO | iBPw #BOEQBTT $POGJHVSFTUIFGJMUFSUP |
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and possible speaker damage. Be aware that | attenuate frequencies above the selected filter | 3) iFreq. RangFw$POUSPM8IFOUISPXOUP |
CPUIiInput Sens.wBEKVTUNFOUTXJMMIBWFUPCF | frequency and below the frequency selected | the right, this switch multiplies the cutoff |
made, regardless of how many input cables are | in the CH 3&4 | GSFRVFODZTFMFDUFECZUIFSPUBSZiFilter Freq. |
feeding the amplifier. These controls will allow | a true bandpass filter | (Hz)wDPOUSPMCZBGBDUPSPG*OUIFix1w |
you to set the appropriate relative levels for CH | position, the range of the rotary control is | |
1&2 relative to CH 3&4 and other amplifier | amplified system. | )[ BTNBSLFE *OUIFix10w |
channels in the system. |
| position, the range of the rotary control is |
| i HPw | )[L)[ )[ |
| filter to attenuate frequencies below the |
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| selected filter frequency. Useful for connection | 4)iFilter Freq. (Hz)w5IFGJMUFSGSFRVFODZ |
| of component speakers to CH 1&2 in a bi- | markings surrounding this rotary control |
| amplified system. | are for reference purposes and are generally |
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| accurate to within 1/3 octave or better. If you |
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| would like to select the filter cutoff frequency |
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| with a higher level of precision, consult the |
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| charts in Appendix A (page 22) of this manual. |
two different filter slopes.
i Offw%FGFBUTUIFGJMUFSGPS$)DPNQMFUFMZ
allowing the full range of frequencies present at the inputs to feed that pair of channels.
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crossovers or requiring
i 12dBw$POGJHVSFTUIFIJHIQBTTGJMUFSGPS$)
3&4 to attenuate frequencies below the selected filter frequency at a rate of 12 dB per octave (Butterworth alignment).
i 24dBw$POGJHVSFTUIFIJHIQBTTGJMUFSGPS$)
3&4 to attenuate frequencies below the selected filter frequency at a rate of 24 dB per octave
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vehicle, different filter slopes may be required to produce a smooth transition between the speakers in the system. Experiment to find the slope which best matches the acoustic requirements
PGZPVSTZTUFN5IFTIBSQFSi24dBwTFUUJOH
will do a better job of protecting small speakers with limited power handling. The shallower
i12dBwPDUBWFTFUUJOHBMMPXTUIFSFBSTQFBLFSTUP
reproduce more low-frequency content.
2)iFreq. Rangew$POUSPM8IFOUISPXOUPUIF right, this switch multiplies the cutoff frequency
TFMFDUFECZUIFSPUBSZiFilter Freq. (Hz)w DPOUSPMCZBGBDUPSPG*OUIFix1wQPTJUJPO UIFSBOHFPGUIFSPUBSZDPOUSPMJT)[ BT NBSLFE *OUIFix10wQPTJUJPOUIFSBOHFPGUIF SPUBSZDPOUSPMJT)[L)[ )[
8 JL Audio - 450/4v2 Owner’s Manual | 9 |