alpine hu problem?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=92766
Printed Date: May 09, 2024 at 4:40 AM

Topic: alpine hu problem?

Posted By: greenbroncoguy
Subject: alpine hu problem?
Date Posted: April 09, 2007 at 9:37 PM

Since installing this HU a week or so ago, it has been working great. My g/f drove it the other day and said when she tried to turn the sub down, that the sub- volume control did not make any difference. I told her she didn't know whatda_ she was doing and to not touch my stereo...

Well, I got in today, popped in a cd, bass was a little boomy, so I try to adjust the sub volume- it does nothing. It was working when I first put in the HU and up until a day or so ago, it has been fine posted_image

Also, my rear speakers are powered off the rear speaker wires from the HU, but either with the DEFEAT) on or off in the HU, they do not come on.?.? Anyone got any ideas?

I know everything is wired right, as it worked for a few days, and to my knowledge, nothing has been changed as far as settings on the HU, and I know for a fact that nothing on either of the amps, or the processor has been messed with.

Head unit is an Alpine CDA-9831, the sub pre-outs from it go into the sub pre-ins on the Precision Power DCX-730, and the sub pre-outs on it go to the mono amp pushing the 2 12's. The front stage pre-outs from the HU go into the front stage pre-ins of the DCX, which in turn run to the 2ch. amp for the front speakers. The rears are currently being power off the rear speaker leads from the HU, but I had the DEFEAT on the HU to shut off the internal amp in it, and send a flat signal to my processor.

Replies:

Posted By: stevdart
Date Posted: April 09, 2007 at 11:12 PM

ooh, shizz that's complicated. And to top it off, you let your g/f drive your car!

I'll have to sober up or get some sleep for this one. But, first impression, if the wires are long enough try bypassing the DCX unit altogether and eliminate that from the equation. You have a diagram to fall back on, right?

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Posted By: jmelton86
Date Posted: April 09, 2007 at 11:44 PM

Defeat doesn't have anything to do with the interanal amps (besides the EQ and x-over settings going to it). Try going into the menu, tap it once(like your going to clock set) and there is an option for turning the internal amps on/off. Make sure it's on.

Also, with my 9830 (same except color changing and power ratings), sometimes the internal amps don't work until I switch the EQ (the easy preset ones) from 'user' to 'flat' and back again. This turns the internal amp on somehow. I don't know what causes this but changing the quick eq from one setting to another (i.e. 'user' (where I have mine) to 'flat' then back again somehow does it.

Good Luck!

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: jmelton86
Date Posted: April 10, 2007 at 7:25 PM

Did that help?

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: greenbroncoguy
Date Posted: April 11, 2007 at 10:09 AM

I found out what the problem was:

I have the control unit sitting in the little cubby thing in my back seat where the arm rest folds down in the center, mainly because it shines the light up against the center consol in the back and looks cool...

Anyway, turns out my g/f flipped the center armrest up in the back seat to get some of her doodie in there, and when she did it switched my DCX to another preset and changed the inputs for the sub to take a signal from the front RCA's- thus making the sub level control of the HU inoperative.

And I was SURE nothing got changed, kinda glad it did though, this could have been hard to diagnose.