Question about Pioneer DEH-P6800MP CD Player

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Bad preoutputs?-thumping noise from sub preout?

My deck has a prob,i have one amp for bass-500/1-soundstream500s.and a rockford fosgate 250/ ground for the deck has been moved to the my amps are grounded to the bolt on the back seat.rca cables are on other side of power antenna is unpluged at the deckand my car is a 1995 lincoln town car exuctive series.if i yous my 3rd preoutput [front] it sounds good but i have to use the crossover for me to connect the rockfordfosgate to work thus cant use the subout for my soundstream

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There is a small surface mounted fuse inside the radio for the pre-out grounds. that fuse must be replaced. Only somebody who knows these radios and has good soldering skills can fix this.

Posted on Jun 17, 2008

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I have a kenwood deck and just got subs and a amp but i have power to amp and no sound out of my rockford fosgates

ok first of all have you tried to run any thing else off the amplifier?

# even if you had the rca's connected to say "front speaker" output you would still be able to get noise out of the xlc's. i know this is going to sound silly but have you connected the RCA's to the amplifiers "RCA ouput" jacks?

another possibility is that amp is going into protect mode because of a bad connection somewhere, possibly in one of the power lines? if the metal inside the sheath touches any part of your cars body it will short, stopping your amp from working.

# another silly one, but one often overlooked, "incorrect fuse amperage"

# or possibly the mosfets have blown in the amplifier.

# last but DEFINITELY not least, if you can tell me the model number to your kenwood source unit i can get more information on it. It is distinctly possible that you need to turn the subs "on" on the head unit. which would be done through the sound settings menu.

i hope i have helped, again any more information you can provide will help me narrow you problem down.

feel free to contact me if this has not solved your problem.

Oh and dont forget to rate my solution.


Jan 12, 2011 | Kenwood KDC-MP235 CD Player

1 Answer

Truck keeps going dead

250 mA drain isn't enough to be a short most likely is the capacitors continuously charging.

One way to confirm this is to put an ammeter (with a fuse inline) in series with your main power feed to your stereo power supply. By adding or disconnecting individual components, you can quickly determine where your power drain is coming from.

Feb 05, 2010 | Car Audio & Video

1 Answer

2v preouts from deck want to make them higher voltage for amp

You can get a line driver, it will add the volts you need and they are adjustable, Audio Control has some nice stuff.

May 31, 2009 | Pioneer DEH-P760MP CD Player

1 Answer

Alpine x200 Subwoofer Preout pushing out a weak signal

Hi, just turn up the gain, though the max voltage may be higher, it does not mean the audible output is higher, alpine decks subwoofer control is an attenuator, so at max it will be the same level as front n rear, on min it is -15db... you will probably find the kenwood is +/- 7db so it has a gain boost...
just crank up the amp gains, problem sorted...

Dec 11, 2008 | Alpine iDA-X200 Car CD/ MP3 Player

1 Answer

The bass box

Hi Jamesroy,

Remove the Audio inputs from the bass box to see if the thump is coming from the Audio input. Of course do this with everything turned on. What we are trying to figure out is where the thump is originating from. If the bass box does not thump when the audio inputs are disconnected, the thump is coming from somehwere between the bass box and the circuits inside the head unit.
If you still have the thump after the Audio input wires are disconnected, then your bass box's amplifier has noise problem. You might try getting a noise filter from best buy to put on the power supply feeding the bass box.

Nov 30, 2007 | Pioneer DEH-P7400 CD Player

1 Answer

No sound from Subwoofers

Did you check the gain level on the amp? Sometimes a bad or loose ground can cause this also. Was it working previosly and it stopped or did it never work at all. Let me know. Hope this helps.

Sep 13, 2007 | Alpine IVA-D300 6.5" LCD Screen DVD Player

1 Answer

Rockford fosgate rfx-9200

If you're talking about the amplifier's power terminals, the positive terminal is designed to be wired directly to the battery (be sure to fuse the amp power wire near the battery terminal). The negative terminal should be bolted to vehicle chassis metal for a ground connection. The only amplifier connections that go to the back of the head unit are the remote turn-on wire and the RCA cables.

Aug 16, 2007 | Rockford Fosgate RFX-9200 CD Player

1 Answer

Subwoofer Output Not Working...

The first thing to try is disconnecting ONE of the two subs. See if you get more bass with a single sub than with both. If you do, re-connect the second subwoofer, but reverse the (+) and (-) wires.

Jun 19, 2007 | Panasonic MXE CQ-C7401U CD Player

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