4ohm speaker with 8 ohm receiver? - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 7 Old 12-24-2004, 03:11 PM - Thread Starter
Member
 
Ricsta's Avatar
 
Join Date: Jun 2004
Location: NY
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I have a pair of 4 ohm car audio woofers that I want to replace my home speakers with, but my receiver is rated at 100W per channel 8 ohm. What's the risk of using 4 ohm speakers with the receiver?

It's never too late to learn something new
Ricsta is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 12-24-2004, 08:32 PM
AVS Special Member
 
Eyleron's Avatar
 
Join Date: Dec 2003
Location: Minot, ND
Posts: 2,070
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 61
That 100 w / channel @ 8 ohm spec is almost meaningless. Kind of like if I told you I can type 200 words per minute, but didn't qualify that statement with what kind of accuracy I can achieve. Would you rather hire Typist A, who types 100 words per minute with 97% accuracy, or Typist B who types 200 with a 45% accuracy?

So your receiver might achieve 100 watts at only 1,000 Hz, and with 2% distortion. It'd be better to know that it achieves 100 watts from 20 Hz to 20,000 Hz, with never more than .05 % distortion.

More to the point of your question, ideally they'd tell you how the amp will perform at 4 or 6 ohm speakers. I've read that the 4 ohm rating should be 50% or more higher than the 8 ohm rating. The resistance of your new 4 ohms will be much less, so it should draw way more watts. If it can't, then the amp is being severely stressed out.

This will be more of a problem if the new speakers are of low sensitivity, than if they are higher (like more than 92 dB).

Why are you using car audio woofers? You say you are replaciing speakers with woofers...Do they include tweeters?
Eyleron is online now  
post #3 of 7 Old 12-24-2004, 08:45 PM
AVS Special Member
 
CCarncross's Avatar
 
Join Date: Apr 2004
Location: NE Ohio
Posts: 3,361
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 11
Whats the receiver, someone will undoubtedly known enough about it to tell you if it can handle pushing 4 ohm loads or not.
CCarncross is offline  
post #4 of 7 Old 12-25-2004, 08:55 AM - Thread Starter
Member
 
Ricsta's Avatar
 
Join Date: Jun 2004
Location: NY
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Yes, I have tweeter and mid speakers. I'm changing the woofer becuase it's acting up. I'm using car woofers because I have a pair hanging around not in use and thought I would try and see if they perform better than the ones currently in use.

The amplifier is Sony STR-SE591

It's never too late to learn something new
Ricsta is offline  
post #5 of 7 Old 12-25-2004, 08:18 PM
AVS Special Member
 
louthewiz's Avatar
 
Join Date: Oct 2003
Location: Brooklyn U.S.A.
Posts: 4,081
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
That is not a good idea what you should do is purchase replacement woofers from a place like www.partsexpress.com who are clearly experts in the replacement speakers department. And using a 4 ohm speaker with an amp or reciever that is rated only at 8 ohms minimum is not a good thing to do because what you will do is make the amp/reciever work harder for a 4 ohm load which needs less resistance and it CAN damage the amplifier for sure.
louthewiz is offline  
post #6 of 7 Old 12-25-2004, 11:44 PM
Member
 
nmyeti's Avatar
 
Join Date: Nov 2004
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I have a related question. I have a Pioneer 1014 that I am using in 5.1 mode. I've been thinking of replacing my front speakers, but one of the sets I am looking at is a 4 ohm load. I know that I shouldn't run this receiver at 4 ohms. The speakers however allow you to bi-amp them. Can I use the back surround channels to bi-amp the front speakers so that the receiver will never see more then an 8ohm load?

-Nathan
nmyeti is offline  
post #7 of 7 Old 12-26-2004, 10:54 AM
AVS Special Member
 
Eyleron's Avatar
 
Join Date: Dec 2003
Location: Minot, ND
Posts: 2,070
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 61
You should keep the front and center as close to each other as possible in terms of characteristics. Ideally, same speaker. As that's usually not possible, at least a center that belongs with the front two, in the same model line from that manufacturer.
Eyleron is online now  
Closed Thread Receivers, Amps, and Processors

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off