Question about Alpine CDE-7856 CD Player

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Still no sub woofer output

I tried just hooking up one sub at a time and still no output. Gain is set between 2/3 and 3/4 way up on amp. I got some new alpine 6x9's and a conveter box that takes the L and R speaker wires and turns them into RCA cables. I ran those to my first amp to power my 6x9's. They sound GREAT. I unplugged those RCA cables from the first amp and hooked them up to my Sub amp and it works, but not a lot of bass control that way. There is a little signal coming out of Sub output of HU. However, there is no difference with sub channel turned on or off. I'm at the point where i believe the Sub output on HU might be bad. That sucks though. Any other help would be great.

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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.

Posted on May 26, 2008

  • Sumeet Sodhi May 27, 2008

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1 Answer

Powers up but no speaker output


Hello montez1599,

That's a great amp.

You do not say what subs you are connecting or what wiring configuration you are using. But there should be no problem if the amp is powering up normally. I'd check the gain and crossover settings to make sure they match the subs.

Having 2 +'s and 2 -'s is just a convenience for connecting more than one sub to the amp. If you have just one sub, connect to either of the positives and either of the negatives (they're connected internally). If you have 2 subs, you can run separate wires to each sub or you can wire the subs together and then run just one positive and negative to the amp.

Hope this helps.

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yes that is the cause sorry..i have done it before when i was younger a few times thats how i know..sorry man

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1 Answer

No Subwoofer output


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.

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

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