Help! Head Unit probs

[dangermouse_se]

Just fitted a Kenwood KDC-W8027 head unit. The problem is that the sound seems to go muffled in a pulsing manner every now again. Sought of muffled - not muffled - muffled etc. Seems to be at higher volumes and different tracks seem more prone to it.

Any ideas? Works okay most of the time but once it starts it continues unless I turn the power off and on or turn the volume down.

The rest of the set up was in already and worked fine with my last head unit:

Front speakers : components (Focal Access 130a woofers / x-overs with Pioneer TST23 tweeters)
Rear speakers: Co-axial 2-way (Infinity 5002i)
Sub: Alpine V-Power Amp with Kenwood 10" sub

 

[Pete]

Are you running the speakers off the internal amp? Is it a high power internal amp? Have you got a decent power feed to the hu?

 

[dangermouse_se]

Its the internal amp. 50w x 4 (MOSFET). Using the Renault standard (ISO) wiring.

 

[Pete]

You probably need to run a seperate power cable from the battery rather than using the standard ones.

 

[KDF]

is it just one speaker that it happens on, could be a faulty internal amp, or speakers. Do you run it through a splitter ?

 

[dangermouse_se]

No its the whole sound. Splitter? Do you mean a crossover? If so there are two front crossovers and the rest is filtered by the HU for the Sub / speaker outputs.

 

[dangermouse_se]

If I run new live / earth should I do that for the permanent live or the switchable? Dont really want a feed from the battery to the switchable wire cos then the face plate wont hide when I turn off the ignition.

 

[Pete]

Permanant.

 

[dangermouse_se]

Right so basically were looking the same principle as an external amp? Straight to the battery for live, good earth to the car body and the switchable is okay as is cos it just turnes the thing on an off?



Cheers.

 

[h3lter]

i never heard so much bollox! the standard wiring will be well sufficient !

sum thing else is wrong! u def dont need to run no extra power to the HU





sorry pete!



i got mates running HU that are dvd motorised, and every this else u can think of! and all have never had power problems!


[Edited by h3lter on 05 October 2004 at 12:48pm]

 

[h3lter]

to me it sounds like u got a short of sum kind! u sure that wen u pushed the HU in u havvent cut into any of the wires slightly?

i have a kenny HU and i had this problem with one of the wires, the outer casin of the wire is not very protective to the nice sharp renault bits on the inside of the dash!

also try checkin ure crossovers and make sure u dont have a stray bit of wire touching any thin it shouldnt!



also make sure u use qualitly wire to wire up all the speakers instead of the cheap bollox they give u with the speakers!



[Edited by h3lter on 05 October 2004 at 12:56pm]

 

[dangermouse_se]

The speaker wire is HQ for the fronts, the rears are using the standard Renault wiring but they had no problems with my Sony.

Ill take the HU out and check for shorts but while Im in there Ill probably run the new wiring anyway. I had a stereo a wee while ago that would cut out if you turned it up and that was poor earthing.

I know where Pete is coming from, its not to do with how much kit you have its whether the amps are starving of power.

Short wise Id expect more of a crackling or cutting out than loss of sound quality...and at any volume.

 

[h3lter]

ok mate its up to u but it dont sound like power probs to me! i got sum heavy duty power draining stuff in my clio and she is fine!

(ask the spa lot about how heavy duty lol)

 

[dangermouse_se]

Im trying not to think about it being a faulty HU. Im on my third one, I cant be that unlucky surely...

 

[h3lter]

u could be doin summat wrong lol

 

[dangermouse_se]

Maybe but as the wiring is ISO I cant see where I might be....

The first two HU were SONY and were def faulty, thats why I fit the Kenny but overall the sound quality is shi*te and as I say when I turn it up I get this wave effect of muffled sound.

Going to pull it out maybe tonight and have a good look at the speaker wiring behind the unit. The OSF tweeter is crackling too. Hope its all just a trapped wire.