Car Audio Car audio related questions and helpful hints for building the best sound system for your car or getting the most out of what you have.

Does impedence matter that much?

Thread Tools
 
Search this Thread
 
Old Mar 22, 2004 | 08:18 PM
  #1  
ken3983's Avatar
Thread Starter
Senior Member
 
Joined: Oct 2001
Posts: 504
Likes: 1
From: reidsville,nc,usa
Car: 1989 Firebird Formula 350
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 9 Bolt Borg Warner 3.27 gears
Does impedence matter that much?

I got a 91 RS and dropped in a CD tuner from a 98 Camaro.I have JVC front and rear speakers at the moment.Would I get better sound off what I have at 4 ohms or is it better to go with the factory impedence speakers to match the radio?What was the factory impedence anyways?Hmmmmmm.

-Ken
Reply
Old Mar 23, 2004 | 12:42 AM
  #2  
onebadwagon's Avatar
Senior Member
 
Joined: Jan 2003
Posts: 857
Likes: 0
From: dallas tx
4 ohm is the norm for mids/highs, single 4 ohm or dual 4 ohm is the norm for subs.
Reply
Old Mar 23, 2004 | 01:58 AM
  #3  
Boomin Boy's Avatar
Senior Member
 
Joined: Dec 2003
Posts: 722
Likes: 0
From: abbotsford, bc
Car: 83 z28
Engine: 300hp 355
Transmission: T5
Originally posted by onebadwagon
4 ohm is the norm for mids/highs, single 4 ohm or dual 4 ohm is the norm for subs.
chances are your stock speakers will be 4 ohm aswell
Reply
Old Mar 23, 2004 | 12:56 PM
  #4  
demicon's Avatar
Member
 
Joined: Mar 2003
Posts: 316
Likes: 0
From: BC Canada
Car: 89 Firebird
Engine: 2.8 MPFI
Transmission: 700r4
The stock 4x6's might be 10 ohm.. it will say on the underside of the magnet.

Mine are 10 ohm.
Reply
Old Mar 23, 2004 | 04:17 PM
  #5  
NEEDAZ's Avatar
Supreme Member
 
Joined: Oct 1999
Posts: 1,734
Likes: 0
From: Westminster, MD
Car: 89 IROC-Z
Engine: 355 TPI
Transmission: 700R4
To answer the question in you title, YES.

Not just for the sound, but for the equipment lasting.

But in your case you should be good with 4 ohm speaker all the way around.
Reply
Old Apr 2, 2004 | 12:06 AM
  #6  
junkyarddog's Avatar
Supreme Member
 
Joined: Jan 2000
Posts: 1,298
Likes: 0
From: Salem, NH
Car: 1999 Chevy Cavalier
Engine: 2.2
Transmission: 5 speed
Axle/Gears: it's part of the transmission
Reminds me of the two months i spent installing at Discount Auto Sound!!

How many cars did I have to wire up with nice aftermarket stuff, going through horibbly mismatched impedences....with subs speakers....whatever. What a discrace!

Yes 4 ohm per channel is the desirable impedence for that HU.

NEEDAZ, are you familiar with an active impedence matching network like the zobel? I'm in search of good schematics for one. I want to experiment with different types of speakers with different systems.
Reply
Old Apr 2, 2004 | 07:59 AM
  #7  
NEEDAZ's Avatar
Supreme Member
 
Joined: Oct 1999
Posts: 1,734
Likes: 0
From: Westminster, MD
Car: 89 IROC-Z
Engine: 355 TPI
Transmission: 700R4
NEEDAZ, are you familiar with an active impedence matching network like the zobel? I'm in search of good schematics for one. I want to experiment with different types of speakers with different systems.
A Zobel network is a passive device and vary simple circuit with some vary complex theory to get it to work right. They are used most on the output of high-end PASSIVE crossovers that are to used with a dedicated speaker. They are a simple series RC network to compensate for the inductive slope of a speaker and give it a much flatter impedance. This is important with passive crossover because as the impedance goes up, so does the xover frequency (xover frequency being determined in part by load resistance/impedance). So your 6Db slope xover doesn’t have a 6Db slope with out a good working Zobel. The Le of the speaker being used will determine the value of the capacitor in the network. So the network must be designed to work with a specific speaker (or model of speaker).

http://www.trueaudio.com/st_zobel.htm
http://users.ece.gatech.edu/~mleach/...oads/zobel.pdf
http://www.audiotweaks.com/tweaks/tweak_387.htm

A well designed active crossover should not have these problems as they should not be load dependent.

Last edited by NEEDAZ; Apr 2, 2004 at 08:33 AM.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
loud91rs
Camaros Wanted
11
Mar 28, 2016 04:13 PM
Bubbajones_ya
Auto Detailing and Appearance
24
Oct 25, 2015 08:01 PM
racereese
Tech / General Engine
14
Oct 3, 2015 03:46 PM
Damon
Tech / General Engine
8
Sep 26, 2015 04:29 PM
Abubaca
Transmissions and Drivetrain
5
Sep 20, 2015 09:35 PM




All times are GMT -5. The time now is 01:05 AM.