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4ohm/8ohm question


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peteacher 
Member - Posts: 5
Member spacespace
Joined: November 04, 2003
Location: Australia
Posted: November 04, 2003 at 4:27 PM / IP Logged  
Hello everyone...I have a typical 4 ohm amp that I have not used for ages...and I want to buy a sub that is 8ohm...
Q1. Can I use an 8ohm sub on a 4 ohm amp?
Q2. IF I bridge 2 channels on the 4ohm amp, can I use it to drive the 8ohm sub?
Q3. If I was to buy 2 of these 8ohm subs and run them in parallel, would that work?
superstreet786 
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Joined: August 12, 2003
Location: United States
Posted: November 04, 2003 at 4:31 PM / IP Logged  
I know for sure Q3 would work but im not sure about the others
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auex 
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Posted: November 04, 2003 at 5:07 PM / IP Logged  
1. The amp will work with many different ohm loads, just don't go below what it is stable at. 2. Yes. 3 if you wired two 8 ohm speakers parrallel it would be a 4 ohm load, so yes it would work.
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forbidden 
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Joined: November 01, 2003
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Posted: November 04, 2003 at 5:29 PM / IP Logged  

All of your questions are answered by yes.

(1) by using a single 8 ohm sub on the amp, all it will do is knock the amps power down by 50%, not really what we want to do.

(2) Bridge the amp to 4 ohm mono, lets say that you amp produces 200w at 4 ohm mono, with 8 ohm sub hooked up, yuo now have 100w at 8 ohm mono, still not what we want.

(3) two 8 ohm subs wired in parallel equals 4 ohm mono. Exactly where your amplifier in bridged mode makes the most power. To wire in parellel, take a look at the parallel wiring chart on this site, it will show you graphically and mathematically how to hook up your speakers, need more info, there are a lot of owner / installers like myself who would be glad to help you out.

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peteacher 
Member - Posts: 5
Member spacespace
Joined: November 04, 2003
Location: Australia
Posted: November 04, 2003 at 9:01 PM / IP Logged  
Thanks everyone...
I am wondering where I can see the wirting diagrams on this site. I have found some with relays..is that the one you are talking about "forbidden"?
Ketel22 
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Joined: August 23, 2003
Location: United States
Posted: November 04, 2003 at 11:38 PM / IP Logged  
if you click the parallel and series calc, under car audio that will be alot of help, if you need to under stand the parallel and series concepts better, i would suggest the rockford site ( http://www.rockfordfosgate.com/rftech/wiringwizard/), which will show you the options with the subs that you have.
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