Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Car Audio
Car Audio Do you live in your car? Then you need to be able to listen to some high-quality music.
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 03-09-2006, 08:58 PM   #1
302exploder
AF Regular
 
Join Date: Jan 2006
Location: Beecher, Illinois
Posts: 131
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to 302exploder
Subwoofer: 2 ohm or 4 ohm

what is the difference between 4 and 2 ohm subwoofer, and which one is better
302exploder is offline   Reply With Quote
Old 03-09-2006, 10:57 PM   #2
PaulD
Audio Guy
 
Join Date: Mar 2002
Location: huntsville, Alabama
Posts: 4,700
Thanks: 1
Thanked 21 Times in 18 Posts
Send a message via AIM to PaulD Send a message via Yahoo to PaulD
Re: Subwoofer: 2 ohm or 4 ohm

a 2 ohm speaker is 1/2 the load on an amp that a 4 ohm speaker. The real usefulness is picking speaker(s) that load the amp down as much as possible, to increase the amps output power.
PaulD is offline   Reply With Quote
Old 03-09-2006, 11:09 PM   #3
302exploder
AF Regular
Thread starter
 
Join Date: Jan 2006
Location: Beecher, Illinois
Posts: 131
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to 302exploder
Re: Subwoofer: 2 ohm or 4 ohm

alright, thanks
302exploder is offline   Reply With Quote
Old 03-10-2006, 09:15 AM   #4
Jet-Lee
Banned
 
Jet-Lee's Avatar
 
Join Date: Apr 2004
Location: Springdale, Arkansas
Posts: 2,580
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to Jet-Lee Send a message via Yahoo to Jet-Lee
Re: Subwoofer: 2 ohm or 4 ohm

Quote:
Originally Posted by PaulD
a 2 ohm speaker is 1/2 the load on an amp that a 4 ohm speaker. The real usefulness is picking speaker(s) that load the amp down as much as possible, to increase the amps output power.
I don't understand.

If an amp is 2ohm stable, and it pushes 500wrms @ 2ohms, it gives ~250wrms at 4ohms, correct?

How would loading the amp with more resistance get more power from it when 1/2 the resistance pulls twice as much power?
Jet-Lee is offline   Reply With Quote
Old 03-10-2006, 11:27 AM   #5
Johannes
Banned
 
Join Date: Nov 2003
Posts: 357
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Subwoofer: 2 ohm or 4 ohm

Quote:
Originally Posted by PaulD
a 2 ohm speaker is 1/2 the load on an amp that a 4 ohm speaker. The real usefulness is picking speaker(s) that load the amp down as much as possible, to increase the amps output power.
I think "load the amp down" means lower the resistance.
Johannes is offline   Reply With Quote
Old 03-10-2006, 11:35 AM   #6
alphalanos
AF Enthusiast
 
Join Date: Jul 2002
Location: clearwater, Florida
Posts: 2,654
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Subwoofer: 2 ohm or 4 ohm

Less resistance yields more power. Example: a 4 ohm DVC sub can be wired to 2 ohms. A 2 ohm DVC sub can be wired to 1 ohm, wich will receive more power assuming the amp is 1 ohm stable.
__________________
96 EJ6. Future home of boosted B18C1.
alphalanos is offline   Reply With Quote
Old 03-10-2006, 11:40 AM   #7
Jet-Lee
Banned
 
Jet-Lee's Avatar
 
Join Date: Apr 2004
Location: Springdale, Arkansas
Posts: 2,580
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to Jet-Lee Send a message via Yahoo to Jet-Lee
Re: Subwoofer: 2 ohm or 4 ohm

Quote:
Originally Posted by Johannes
I think "load the amp down" means lower the resistance.
...makes sense...
Jet-Lee is offline   Reply With Quote
Old 03-10-2006, 11:41 AM   #8
Johannes
Banned
 
Join Date: Nov 2003
Posts: 357
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Subwoofer: 2 ohm or 4 ohm

302exploder, these wiring diagrams might be helpful:

http://www.crutchfieldadvisor.com/IS...rs_wiring.html
Johannes is offline   Reply With Quote
Old 03-11-2006, 11:24 AM   #9
302exploder
AF Regular
Thread starter
 
Join Date: Jan 2006
Location: Beecher, Illinois
Posts: 131
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to 302exploder
Re: Subwoofer: 2 ohm or 4 ohm

so let me see if i got this right: the impedence of the sub doesn't have to match the impedence of the amp. so i can have a dual 4 ohm voice coil sub and run it off an amp at 2 ohms? and a sub with higher impedence will pull more power from an amp?
302exploder is offline   Reply With Quote
Old 03-11-2006, 12:30 PM   #10
Johannes
Banned
 
Join Date: Nov 2003
Posts: 357
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Subwoofer: 2 ohm or 4 ohm

Quote:
Originally Posted by 302exploder
so let me see if i got this right: the impedence of the sub doesn't have to match the impedence of the amp. so i can have a dual 4 ohm voice coil sub and run it off an amp at 2 ohms? and a sub with higher impedence will pull more power from an amp?
Correct, a dual 4 ohm sub wired in parallel can be run off an amp at 2 ohms. However, a higher impedance will pull less power from an amp... a lower impedance will pull more power from an amp.

Take a look at the power ratings on this amp: http://www.drdetailshop.com/d1100d.htm

It does 425 x 1 @ 4 ohms, 800 x 1 @ 2 ohms, and 1100 x 1 @ 1 ohm.
Johannes is offline   Reply With Quote
Old 03-12-2006, 02:18 AM   #11
pimprolla112
AF Enthusiast
 
pimprolla112's Avatar
 
Join Date: Aug 2004
Location: mechanicsville, Maryland
Posts: 1,424
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to pimprolla112 Send a message via MSN to pimprolla112
Re: Subwoofer: 2 ohm or 4 ohm

Higher impedance doesnt pull power from the amp. It puts more resistance one the amp causing the amp to push less power to the speaker. Lower impedance (resistance), the more power the amp can produce. Pretty simple.
__________________
Cant remember who posted it but if you see it give yourself credit

Don't ever look at cars as just imports or domestics. Just because a car is made in a certain country doesn't mean that it is anything like another car from that country. An example of this is Mitsubishi reliability, just because they are Japanese doesn't mean that they are as reliable as a Honda or Toyota.

Cardomain
pimprolla112 is offline   Reply With Quote
Old 03-12-2006, 08:38 AM   #12
PaulD
Audio Guy
 
Join Date: Mar 2002
Location: huntsville, Alabama
Posts: 4,700
Thanks: 1
Thanked 21 Times in 18 Posts
Send a message via AIM to PaulD Send a message via Yahoo to PaulD
Re: Subwoofer: 2 ohm or 4 ohm

after looking at my original post ..... I meant to say that a 2 ohm speaker is twice the load, not 1/2. Thanx for catching it.
PaulD is offline   Reply With Quote
Old 03-12-2006, 10:10 AM   #13
CBFryman
Banned
 
CBFryman's Avatar
 
Join Date: Aug 2004
Location: Lake City, Florida
Posts: 3,705
Thanks: 0
Thanked 1 Time in 1 Post
Send a message via AIM to CBFryman Send a message via Yahoo to CBFryman
Re: Subwoofer: 2 ohm or 4 ohm

takes twice to force to reach equal power output in 4ohm than 2ohm.
CBFryman is offline   Reply With Quote
Old 03-12-2006, 11:30 AM   #14
pimprolla112
AF Enthusiast
 
pimprolla112's Avatar
 
Join Date: Aug 2004
Location: mechanicsville, Maryland
Posts: 1,424
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to pimprolla112 Send a message via MSN to pimprolla112
Re: Subwoofer: 2 ohm or 4 ohm

I was just trying to state that the sub doesnt pull power from the amp The amp puts out power relative to the impandance conected to the amp.
__________________
Cant remember who posted it but if you see it give yourself credit

Don't ever look at cars as just imports or domestics. Just because a car is made in a certain country doesn't mean that it is anything like another car from that country. An example of this is Mitsubishi reliability, just because they are Japanese doesn't mean that they are as reliable as a Honda or Toyota.

Cardomain
pimprolla112 is offline   Reply With Quote
Old 03-12-2006, 12:20 PM   #15
Johannes
Banned
 
Join Date: Nov 2003
Posts: 357
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Subwoofer: 2 ohm or 4 ohm

Quote:
Originally Posted by pimprolla112
I was just trying to state that the sub doesnt pull power from the amp The amp puts out power relative to the impandance conected to the amp.
Right... I said it wrong.
Johannes is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Bookmarks
Go Back   Automotive Forums .com Car Chat > Car Audio

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 09:10 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts