Egine Noise on ICE
Thread Starter
Joined: Nov 2003
Posts: 25,566
Likes: 2
From: Heart of England
Egine Noise on ICE
Hi I'm sure this has been covered before but I cannot find it!
I have a high pitched whine from the front RC620's rising with engine revs, nothing at idle or engine off!
Set up
Alpine 9813 HU
KCE865 dash interface (not working properly!)
Alpine CHA634 Interchanger
Rockford 551X four channel Amp mounted in place of OEM interchanger (gain right down!)
Boston Acoustic RC620 fronts with tweeters on top of A pillar and cross overs under the dash
Boston Acoustic RC520 rears about to go in to DIY Spods!
Aura Bass Shakers in rear seat pockets powered off HU rear channels
Cable routes
Power & remote on down plastic trunk on passenger side sill along with power for amp.
RCA/phono's, interchanger and bass shaker outputs from 9813 internal amp rear channels down transmission tunnel. Bass Shaker cable either side all other on passenger side.
Front speaker cables across floor pans close to bottom of sills on either side with crossovers under the dash
Tweeters on top of A pillar
RC520's & crossovers not yet in place but amp is powering the cable which is in place!
I have a high pitched whine from the front RC620's rising with engine revs, nothing at idle or engine off!
Set up
Alpine 9813 HU
KCE865 dash interface (not working properly!)
Alpine CHA634 Interchanger
Rockford 551X four channel Amp mounted in place of OEM interchanger (gain right down!)
Boston Acoustic RC620 fronts with tweeters on top of A pillar and cross overs under the dash
Boston Acoustic RC520 rears about to go in to DIY Spods!
Aura Bass Shakers in rear seat pockets powered off HU rear channels
Cable routes
Power & remote on down plastic trunk on passenger side sill along with power for amp.
RCA/phono's, interchanger and bass shaker outputs from 9813 internal amp rear channels down transmission tunnel. Bass Shaker cable either side all other on passenger side.
Front speaker cables across floor pans close to bottom of sills on either side with crossovers under the dash
Tweeters on top of A pillar
RC520's & crossovers not yet in place but amp is powering the cable which is in place!
Thread Starter
Joined: Nov 2003
Posts: 25,566
Likes: 2
From: Heart of England
Thnx - Doubt it is RCA's or cable both are top quality.
I reckon I may have an earthing problem reading a few other threads. I have used the captive bolt from the OEM interchanger directly under the amp to keep the cable short. I reckon I will move this to the cross brace! Also the HU earth is on to the large screw that holds the plastic frame to the metal. The one between the two holding the HU in! I reckon this could be suspect as well! To add insult to injury I have screwed the amp directly to the boot floor so I guess I could have an earth loop there if the amp casing is not ground internally. I will check these out tomorrow as its 23.30 over here!
I reckon I may have an earthing problem reading a few other threads. I have used the captive bolt from the OEM interchanger directly under the amp to keep the cable short. I reckon I will move this to the cross brace! Also the HU earth is on to the large screw that holds the plastic frame to the metal. The one between the two holding the HU in! I reckon this could be suspect as well! To add insult to injury I have screwed the amp directly to the boot floor so I guess I could have an earth loop there if the amp casing is not ground internally. I will check these out tomorrow as its 23.30 over here!
Thread Starter
Joined: Nov 2003
Posts: 25,566
Likes: 2
From: Heart of England
Updated
Disconnected RCA's from Amp - still some pick up
Floated the amp off earth - no difference
increased amp earth cable sized and relocated it to rear cross bar bolt as per other threads!
Hmm
Disconnected RCA's from Amp - still some pick up
Floated the amp off earth - no difference
increased amp earth cable sized and relocated it to rear cross bar bolt as per other threads!
Hmm
Registered User
Joined: Sep 2003
Posts: 341
Likes: 0
From: Berkshire
Are you saying with no phono inputs connected to the amp, you still get the whine?
Could the amp be faulty and introducing noise on the output stage?
Could the speaker wires be actually picking up noise from the power leads?
Could the amp be faulty and introducing noise on the output stage?
Could the speaker wires be actually picking up noise from the power leads?
Registered User
Joined: Oct 2000
Posts: 7,134
Likes: 3
From: Columbia, MD
If the amp still whines with no inputs, it's either picking up noise form the power/ground connection, or the outputs. I'm not sure what wive's tale started it, but Increasing the ground thickness isn't going to rid anyone of noise.
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Thread Starter
Joined: Nov 2003
Posts: 25,566
Likes: 2
From: Heart of England
Update
Exact noise probles are:
ICE ON
Clicking at engine idle in tweeters on A posts
High pitched whine above 4k rpm
ICE OFF
Low level hum from tweeters!
DONE
Floated amp to stop screws causing possible earth loop on anp case! No difference
Increased earth cable size changed connector to screw type rather than crimp and earthed to rear cross brace bolts with paint scrapped. No difference
Disconnected amp RCA's.
GOING TO DO
Relocate HU earth to better location
Check speaker cable routes
Replace suspect/faulty KCE (doubt this is the probem!)
Work back from tweeters to head unit with ICE off to isolate source of hum
Work back from tweeters to head unit with ICE on to isolate source of whine!
Try disconnecting bass shakers @ HU
Try turning off HU internal AMP
Any other suggestions!
RCA's are these http://www.maplin.co.uk/products/module.as...0804&Products=1
Phono cable is this
http://www.maplin.co.uk/products/module.as...=131&Products=2
I've made them up to length!
Exact noise probles are:
ICE ON
Clicking at engine idle in tweeters on A posts
High pitched whine above 4k rpm
ICE OFF
Low level hum from tweeters!
DONE
Floated amp to stop screws causing possible earth loop on anp case! No difference
Increased earth cable size changed connector to screw type rather than crimp and earthed to rear cross brace bolts with paint scrapped. No difference
Disconnected amp RCA's.
GOING TO DO
Relocate HU earth to better location
Check speaker cable routes
Replace suspect/faulty KCE (doubt this is the probem!)
Work back from tweeters to head unit with ICE off to isolate source of hum
Work back from tweeters to head unit with ICE on to isolate source of whine!
Try disconnecting bass shakers @ HU
Try turning off HU internal AMP
Any other suggestions!
RCA's are these http://www.maplin.co.uk/products/module.as...0804&Products=1
Phono cable is this
http://www.maplin.co.uk/products/module.as...=131&Products=2
I've made them up to length!
Thread Starter
Joined: Nov 2003
Posts: 25,566
Likes: 2
From: Heart of England
Update
Actually isolated two problems;
1 Whine from HU injected on RCA's, goes away if RCA's are disconnected from AMP or HU. Moved HU ground - no difference. I'm going to check over connections! Could be linked to dead KCE865 new one on order.
2 Hum and click from speakers even with them disconnected from amp! Traced to noise injection on to crossovers! Relocated each one drivers side against firewall by accelerator cable grommet, passenger side sat on top of dash borad heater vent!
Actually isolated two problems;
1 Whine from HU injected on RCA's, goes away if RCA's are disconnected from AMP or HU. Moved HU ground - no difference. I'm going to check over connections! Could be linked to dead KCE865 new one on order.
2 Hum and click from speakers even with them disconnected from amp! Traced to noise injection on to crossovers! Relocated each one drivers side against firewall by accelerator cable grommet, passenger side sat on top of dash borad heater vent!
