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mark241 
Copper - Posts: 101
Copper spacespace
Joined: March 23, 2003
Posted: May 05, 2003 at 1:01 PM / IP Logged  
luxuryrules, two channel amps can be bridged to 1 channel mono but are only stable a 4-ohms which is why he says "Your amp is 2 ohm stereo & B] 4 ohm mono stable
By wiring 2, 8 ohm subs in parallel, you will put a 4 ohm load on the amp
esmith69 
Gold - Posts: 1,511
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Joined: November 26, 2002
Location: United States
Posted: May 05, 2003 at 1:11 PM / IP Logged  

If they sold him two 4-ohm subs, he could not run them in parallel as that would present a single 2 ohm load to the amp, and the minimum impedence for a bridged load for his amp is 4 ohms.  So with two 4-ohm subs he could wire them both together in series, and then run them off of a single 8 ohm bridged output.  Or he could wire them up one per channel--so each channel would see 4 ohms and you wouldn't fully utilize all the power of the amp.  Neither of these methods will enable him to use all of his amp's available power, however, and that's why he was sold the 8 ohm subs.

Two 8-ohm subs wired in parallel will present a single 4 ohm load to an amplifier.  This single bridged load will maximize the power output of the amp, without danger of overheating it.

Here's a diagram of how you should have the subs hooked up

http://www.rockfordfosgate.com/rftech/wiringwizard/index.asp?WoofQty=2+woofers&WoofImp=Single+Voice+Coil+-+8+ohms&image.x=11&image.y=9

Ethan
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"Patience, persistence, and perspiration make an unbeatable combination for success"
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luxuryrules 
Copper - Posts: 102
Copper spacespace
Joined: March 17, 2003
Location: United States
Posted: May 05, 2003 at 2:22 PM / IP Logged  

Mark, thanks for clarifying that.  So by bridging the amp to make it stable at 4 Ohms, then running the subs in parallel to put a 4 Ohm load on the amp then you have the best setup.  Esmith, are you saying that he was sold those subs with the intention of them being wired like that?

esmith69 
Gold - Posts: 1,511
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Joined: November 26, 2002
Location: United States
Posted: May 05, 2003 at 8:35 PM / IP Logged  

Probably yes, because 8-ohm subs are typically used just for that particular purpose.  True they can also be utilized in tri or quad enclosures, but usually the point of getting two 8-ohm subs is just to run a single 4 ohm mono bridged load to your 2-channel amp.

Ethan
-----
"Patience, persistence, and perspiration make an unbeatable combination for success"
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rand9192 
Member - Posts: 5
Member spacespace
Joined: May 04, 2003
Location: United States
Posted: May 05, 2003 at 11:01 PM / IP Logged  

you are absolutely right esmith..I spoke with them today and that is exactly what they did.  Thank's to everyone who participated in this for me....I learned something.

Marc

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