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annoying whine from speakers


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bumpinexploder 
Copper - Posts: 265
Copper spacespace
Joined: February 06, 2008
Location: Texas, United States
Posted: April 06, 2008 at 9:40 PM / IP Logged  
ok so i have the most killer alternator/engine noise/whine whatever you wanna call it. i have a pioneer 3900DEH HU running the FRONT two 5x7's (alpine). the back 2 are one an amp. since as long as i can remember the FRONT right speaker only, has a slight whine to it. not extremely loud just annoying. it doesnt do it when the engine is off. i thought it was the head unit at first but i got a brand new one. didnt help. thought it was the speaker, put another one in, didnt help. got a new alternator, didnt help. Im pooped on ideas! lol someone please help me with this annoying whine!  
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: April 06, 2008 at 9:50 PM / IP Logged  
I have a feeling that this "whine" you speak of is not the speaker or stereo unit at all. Try sound deadening the doors with dynamat and see if this doesn't help block out whatever engine noise you seem to be experiencing. You may even have to go as far as deadening the firewall... I have worked with a bunch of older vehicles that have all sorts of strange sounds coming from the engine. Dynamat extreme will fix it.
Do whatever makes you happy in life without diminishing the happiness of others
bumpinexploder 
Copper - Posts: 265
Copper spacespace
Joined: February 06, 2008
Location: Texas, United States
Posted: April 06, 2008 at 10:00 PM / IP Logged  
but how will dynamat, BEHIND the speaker, help the noise COMING FROM the speaker? not tryin to be smart *** just wondering.
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
willdkartunes 
Copper - Posts: 250
Copper spacespace
Joined: February 01, 2006
Location: United States
Posted: April 06, 2008 at 10:05 PM / IP Logged  
so you actually had the speaker out of the door and playing, and this sound was coming from the actual speaker itself when you put your ear to it?
Do whatever makes you happy in life without diminishing the happiness of others
techman93 
Silver - Posts: 591
Silver spacespace
Joined: October 28, 2006
Location: Pennsylvania, United States
Posted: April 06, 2008 at 10:06 PM / IP Logged  
I have read that Pioneer radio head units are notorious for engine noise from the rca output ground not being good. There have been posts saying to strip some of the shield of rca cable and attach a wire by soldering to the radio ground wire or solder to the plug on the back.
The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya
sedate 
Silver - Posts: 1,173
Silver spacespace
Joined: July 03, 2004
Location: Colorado, United States
Posted: April 06, 2008 at 10:11 PM / IP Logged  

Does this whine get louder with engine RPM increase?

bumpinexploder wrote:
i have a pioneer 3900DEH HU running the FRONT two 5x7's (alpine). the back 2 are one an amp

Why is your amplifier on your rear stage?

bumpinexploder wrote:
but how will dynamat, BEHIND the speaker, help the noise COMING FROM the speaker?

Because it will stop the door skin/panel from resonating and interfering with the sound coming from the speaker.

A layer of Dynamat Extreme on the outer-door skin is one of the most impressive mods one can make to a car audio system.

"I'm finished!" - Daniel Plainview
bumpinexploder 
Copper - Posts: 265
Copper spacespace
Joined: February 06, 2008
Location: Texas, United States
Posted: April 06, 2008 at 10:17 PM / IP Logged  
ok to everyones questions...WILDK yes it was coming from the actual speaker... TECHMAN93 i have asked a shop about that and they said only if it happens in both speakers not just 1....SEDATE i have a 4 channel amp running 2 component speakers in the back and 2 tweeters in the front (had to amplify the best 4 speakers i had outta 6) also SEDATE, you mean put Dmat right behind the door panel and in front of the firewall of the door?  or in the hollow part of the door between the metals?
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
bumpinexploder 
Copper - Posts: 265
Copper spacespace
Joined: February 06, 2008
Location: Texas, United States
Posted: April 06, 2008 at 10:18 PM / IP Logged  
sorry for double post but yes SEDATE it does get louder with engine rpm.
Pioneer DEH-400UB
Kicker 150.2 mids/highs amp
MB Quart fsa 216 front stage
AudioPipe gd-6001 mono amp
AUDIOQUE SD 15S PREFAB BOX!
C&D Technologies Battery, 1500 CCA, 134 amp storage
149.5 DB's
aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: April 06, 2008 at 10:33 PM / IP Logged  
I would change the wiring so the amp powers the front speakers...I'd rather listen to music in front of me rather than behind.
sedate 
Silver - Posts: 1,173
Silver spacespace
Joined: July 03, 2004
Location: Colorado, United States
Posted: April 06, 2008 at 11:20 PM / IP Logged  

bumpinexploder wrote:
sorry for double post but yes SEDATE it does get louder with engine rpm.

Okay then this is a classic example of alternator whine - Dynamat isn't going to solve this problem.

I'm - uhh - tired so I'll post some solutions in the morning. 

In the meantime, try searching for "alternator whine" and see what ppl recommend.

And get that amp up front.  Jeeze man, amping rear speakers like that!

"I'm finished!" - Daniel Plainview
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