Question about Alpine CDE-7856 CD Player

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No Subwoofer output

I've hooked up my subs and turned the sub channel "on" and set setting up to +15 (highest level it will go) and with radio jacked all the way up (35), it barely has any signal coming to the amp. Got any ideas? Any help would be appreciated.

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  • Anonymous Aug 30, 2008

    i'm missing my sub channel

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  • 158 Answers

The connections to the amp seem to be all wrong .check the wiring again.Does your deck have a seperate sub woofer output ?If it does , just connect one sub, i repeat, just one sub,and see the output.
OR
check the GAIN control on the amp.it should be 2/3rds of the max volume of the cd player.check it is not zero!
AND
Set the amp to the L.P.F. position.
bye .happy listening.

Posted on May 26, 2008

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1 Answer

I have a Kenwood kdc-mp342u car cd player installed in my truck. I have subs hooked up to it and everything was working fine until i had to reset my radio and when i reset it the "sub Level...


Subwoofer output: Hold the (AM-) button down for at least two seconds. You can do this function when "SWPRE" in is set to . The SWPRE (Switching Preout) Switches the preout between rear output ("R") and subwoofer output ("SW").

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How do you hook up a subwoofer to Alpine CDE-7858


go into the menu of the radio make sure sub output turn on

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Sub woofer volume adjustment


The gain dial is not a volume control. The gain dial is used to compensate the output level of your car radio head unit. all car stereo units output are not alike. If you set this gain level too high, it will cause major distortion (clipping) to the audio output of you speakers when cranked up. This excessive distortion WILL eventually, or even quickly damage or blow your speakers.

I personally blown speakers this way no not properly setting this. (lesson learned, I guess :| )

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Subwoofer Output Not Working...


first check that the subwoofer function on the actual head unit is turned up,second check that the gain on the amp is at bout half way then check that it is on a lp (low pass setting)
then check that the boost on the amp is turned up.
please leave feedback.
cheers

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1 Answer

Still no sub woofer output


SET THE CROSSOVER TO "L.P.F."POSITION AND SELECT THE LOWEST FREQUENCY AS THE CROSSOVER POINT.
[AN AMPLIFIER IS SUPPOSED TO "AMPLIFY"(TO INCREASE)ANY OUTPUT.]

TRY CHANGING THE POLARITY OF WIRES FROM AMPLIFIER TO SPEAKERS /SUBWOOFER.{it leads to cancellation of bass output.}
if u still have doubt contact me again.

May 26, 2008 | Alpine CDE-7856 CD Player

1 Answer

Amps and sub-woofer not working


Enter into the Audio Setup mode(press and hold volume button for at least 1 second). Next, repeatedly push the volume button until the display shows "2 ZONE". Make sure this feature is turned off. Hold the volume button again for at least 1 second to leave Audio Setup mode.

Now you need to make sure the Subwoofer Output is turned on. Do this by holding down(AM position) on the control knob(toggle stick) for at least 1 second. Each time the button is pressed, the Subwoofer Output is turned ON/OFF. the display should show "SW ON".

Next, you can go into Audio Control mode(press but do not hold volume button). Keep pressing on the volume knob until "Sub-WLevel" is displayed. Here you can adjust the amount of gain for the Subwoofer ranging from -15 to +15.

I hope this fixes your problem with it.

Cheers

Dec 31, 2007 | Kenwood Excelon KDC-X789 CD Player

1 Answer

NO SUB OUTPUT


The sub outputs are simply lowpass filtered preamp outputs for use with a subwoofer amplifier. They supply a lowpass filtered signal for a subamp or 'powered subwoofer" like a bazooka tube. Test your "basstube" for 12 volt input power and make sure the "sub" setting on the radio is turned up too.

Aug 26, 2007 | Sony XPlod CD Player w/MP3 Playback...

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