how do I remove alt and blower noise ?
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
how do I remove alt and blower noise ?
I tried a search here but came up with nothing.
I have an 88 with a 500 watt amp and Sony headunit. http://www.users.bigpond.com/mpheale...tte/Stereo.htm
For 2 years it had almost undetectable noise from the altenator and blower motor, but in the last year these noises have slowly increased and are now audible.
Can I fit Toroids or balances to the wires and if so which wire(s) need shielding and what should I use?
I basically know nothing about removing the noise, except on old cars a capacitor could be put across the generator's terminals, so I've come here to the fount of Audio knowledge.
S'nut
I have an 88 with a 500 watt amp and Sony headunit. http://www.users.bigpond.com/mpheale...tte/Stereo.htm
For 2 years it had almost undetectable noise from the altenator and blower motor, but in the last year these noises have slowly increased and are now audible.
Can I fit Toroids or balances to the wires and if so which wire(s) need shielding and what should I use?
I basically know nothing about removing the noise, except on old cars a capacitor could be put across the generator's terminals, so I've come here to the fount of Audio knowledge.
S'nut
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by Stingraynut
I tried a search here but came up with nothing.
I have an 88 with a 500 watt amp and Sony headunit. http://www.users.bigpond.com/mpheale...tte/Stereo.htm
For 2 years it had almost undetectable noise from the altenator and blower motor, but in the last year these noises have slowly increased and are now audible.
Can I fit Toroids or balances to the wires and if so which wire(s) need shielding and what should I use?
I basically know nothing about removing the noise, except on old cars a capacitor could be put across the generator's terminals, so I've come here to the fount of Audio knowledge.
S'nut
I have an 88 with a 500 watt amp and Sony headunit. http://www.users.bigpond.com/mpheale...tte/Stereo.htm
For 2 years it had almost undetectable noise from the altenator and blower motor, but in the last year these noises have slowly increased and are now audible.
Can I fit Toroids or balances to the wires and if so which wire(s) need shielding and what should I use?
I basically know nothing about removing the noise, except on old cars a capacitor could be put across the generator's terminals, so I've come here to the fount of Audio knowledge.
S'nut
Le Mans Master
Joined: Jun 2004
Posts: 5,572
Likes: 4
From: Los Angeles Ca
since it wasnt there before; personally i'd try to figure out what changed to warrant the new noise. If the noise steadily increased I'd first assume that it's corrosion of the grounds. Maybe check there before you go on to the band-aid fixes
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,199
Likes: 4
From: Cairns Australia
Thanks me ol mate smacko - will the Toroid guarantee to clean up the sound? do i need it on ALL the leads power and signal?
scot_fx - thanks also, the amp gets power direct from the battery, headunit from the old Bose leads - I'll check all the grounds.
I was wondering if it's power leads or signal leads between CD and Amp or speaker leads ?
S'nut
scot_fx - thanks also, the amp gets power direct from the battery, headunit from the old Bose leads - I'll check all the grounds.
I was wondering if it's power leads or signal leads between CD and Amp or speaker leads ?
S'nut
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by Stingraynut
Thanks me ol mate smacko - will the Toroid guarantee to clean up the sound? do i need it on ALL the leads power and signal?
scot_fx - thanks also, the amp gets power direct from the battery, headunit from the old Bose leads - I'll check all the grounds.
I was wondering if it's power leads or signal leads between CD and Amp or speaker leads ?
S'nut
scot_fx - thanks also, the amp gets power direct from the battery, headunit from the old Bose leads - I'll check all the grounds.
I was wondering if it's power leads or signal leads between CD and Amp or speaker leads ?
S'nut
In the shadowy depths of my memory, I also recall something as simple as a (really straining now!) 1000pf capacitor, screwed onto metal firewall (and herein lays the challenge on a corvette!) and the lead to earth, should also help attenuate the RF.
BUT; you prob want to check my memory out elsewhere (like a car audio forum) as I'm only going by vague memories here now mate.
PS; I already assume you're using quite heavilly shielded wiring.
Burning Brakes
Joined: Jan 2005
Posts: 1,217
Likes: 0
From: Augusta GA
Originally Posted by scott_fx
since it wasnt there before; personally i'd try to figure out what changed to warrant the new noise. If the noise steadily increased I'd first assume that it's corrosion of the grounds. Maybe check there before you go on to the band-aid fixes
I am thinking ground also. From all the times I have done a system, whine noise from the alt. are usually grounds. More over, its possible that the ground you have is not enough for what your running. I bought a ground block for my last system and then grounded it to the body. With a vette, you may just have to ground it to the frame. Good luck
Le Mans Master
Joined: Jun 2004
Posts: 5,572
Likes: 4
From: Los Angeles Ca
Originally Posted by smacko
In the shadowy depths of my memory, I also recall something as simple as a (really straining now!) 1000pf capacitor, screwed onto metal firewall (and herein lays the challenge on a corvette!) and the lead to earth, should also help attenuate the RF.
there was someone on the forum a few weeks back asking about this type of solution. i think they sold it through ecklers or someplace like that. i believe it was c4 specific
Heel & Toe
Joined: Mar 2006
Posts: 15
Likes: 0
That noise is usually from poorly shielded wires having signals "share" through electromagnetic coupling: Heres a couple cheap fixes I have used in the past:
Move the ground point somewhere else and clean the chassis to bare metal
Take two feet of the speaking wire wrap it into loops and attach a ferrous coil to bundle them all together closer to the speaker.(Creates inductance)
1/2w 1/4ohm resistor bridged across the leads(the values will vary depending on wire impedence though)
Decoupling caps across the speaker terminals.
Last I checked: walmat sold an expensive "hum remover" under the Scosche monkier for $8, its basically the above resistor and decoupling caps in a convenient package. I just have a hard time spending $8 for 15 cents worth of discrete components.
Move the ground point somewhere else and clean the chassis to bare metal
Take two feet of the speaking wire wrap it into loops and attach a ferrous coil to bundle them all together closer to the speaker.(Creates inductance)
1/2w 1/4ohm resistor bridged across the leads(the values will vary depending on wire impedence though)
Decoupling caps across the speaker terminals.
Last I checked: walmat sold an expensive "hum remover" under the Scosche monkier for $8, its basically the above resistor and decoupling caps in a convenient package. I just have a hard time spending $8 for 15 cents worth of discrete components.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Originally Posted by Spec
...Take two feet of the speaking wire wrap it into loops and attach a ferrous coil to bundle them all together closer to the speaker.(Creates inductance)...
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Ground, ground, ground.
In my first 3 stereo incarnation, I made a solid ground on the chassis for ALL my components to ground to the same place. Clean, pure sound.
In my latest incarnation, I ran out of time, got lazy and grounded everything on the seat bolt.
Result? Alternator whine.
I would check your grounding point(s) first before buying anything.
2 cents deposited.
EG
In my first 3 stereo incarnation, I made a solid ground on the chassis for ALL my components to ground to the same place. Clean, pure sound.
In my latest incarnation, I ran out of time, got lazy and grounded everything on the seat bolt.
Result? Alternator whine.
I would check your grounding point(s) first before buying anything.
2 cents deposited.
EG