Question about Pioneer DEH-P9800BT CD/MP3/WMA Player/Blue Tooth Enabled

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Alternor noise i have a pioneer deh-p9800bt hu which i have connect up to a rockford fostgate 4ch amp i have run the power wire down one side and the rcas and remote down the other side but when i turn it on i have a whinning noise. I have changed the hu and the problem has gone why do i only get it with the pioneer unit.

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I had the same problem with my Pioneer Head Unit.

I changed the ground of the Head Unit and the AMP to the same location and that took care of the Alternator noise.




Best of Luck.

Posted on Nov 11, 2007

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Posted on Jan 02, 2017

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1 Answer

I have two 4ohm dual kicker compr 12s in a ported box, wired to a Rockford Fosgate 10001x BD amp at 1ohm,with 4 gauge ground and power wire. I'm also using 12 gauge speaker wire, and my HU is a JVC AVC-60...


If by "whiting" you mean "whistling" then yes, you probably have a ground issue and you are picking up alternator noise. Or you might have a very noisy alternator due to failing diodes, but the most likely scenario is a grounding issue. If you unplug the signal input to the amplifier is the noise still present? If so, the grounding issue is likely with the amp itself. If not, then the grounding issue could be with the head unit or quality of RCA cables between the HU and the amp. Do you have a crossover on the Rockford amp for the subs?

I'm also curious why you are running these subs at 1ohm. Are they dual voice coil subs and each voice coil is 4 ohms? If so, why not be a bit gentler on the amp and run the sub voice coils in series, then parallel the two subs to the amp to run 4 ohms? Running at 1 ohm is likely going to generate a lot of heat from that Rockford amp which will likely decrease its service life.

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hi there
that is a big system
well common problem with feedback is the power wires connected to amps and the RCA wires run from the pioneer unit to the amps are too close to each other if the power wire from the battery to the amps are run down (left) side of car make sure RCA and remote wire are run down the (right) side of the car if this is done like this than it could be the RCA cables you are using the other thing is if you rev the engine does it get louder if this is the case then the noise you hear is the alternator of your car to get rid of the feedback look at your amp power wire and load it with electrical tape or buy a piece of dynamat and place it around the amp power wire this will stop that...........if what i just said doesn't happen when you rev engine than ground each amp to its on metal frame (do not ground them together) this should also stop the feedback. make sure all RCA cables are no where near the amp power cable from your cars battery
hope i was able to help

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how did u pair/connect ur voyager to ur deh-p9800bt? i tried from the head unit and from the phone.. read both books.. just cant seem to figure it out.. can u email me what u did plz? pt400kyle@hotmail.com

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Since vehicles started using High Energy Ignition engine noise in stereo equipment has been a issue. You have two options. The first is to try connecting your power wire to a alternate source that may have internal filtering. If you cant find a clean source of power you will have to add a inline filter on your power wire. You can pick them up at any stereo shop.

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I have the same problem with My HU of over heating especially during the hot days of summer. I am gonna try to install a pc fan(square one's)underneath the HU to cool it doqn a bit. Im also gonna run a power wire to the radio power wire so the fan turns on when i turn on the radio on. I want to see if the HU is still overheating. My HU overheats even when just sitting in the car.

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There is a yellow wire that needs to be connected to a constant +12 volt supply. This wire retains all of the pre-sets, settings, etc.

It sounds like it is not.

Check the connections with a volt meter with the vehicle off to verify it has constant +12 volts.



Best of Luck.

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If the display goes out then it is possible the flex cable is broken. Return it to Rockford for repairs.

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