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I am currently running two 12" RF XLC's (4ohms each) off of a RF power 500a2. From my previous posts, I've learned that the amp can push a lot more power, and I'm not really happy with my sealed box. I'm thinking of building a new box ported box, and getting a third 12" XLC. The space between my wheel wells in the trunk is 35" which isn't enough for three 12's so I'm thinking of building a pyramid shaped box kinda like this ____________ /---------------\ /-----------------\ /-------------------\ Sub --- Sub --- Sub Does anyone have a better idea, and should I wire three 4ohm subs in parallel of series?
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[This message has been edited by DarkAcura (edited 08-19-99).]
[This message has been edited by DarkAcura (edited 08-19-99).]
[This message has been edited by DarkAcura (edited 08-19-99).]
Posts: 305 | From: Brooklyn, New York, USA | Registered: Aug 1999
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3 4ohm 12 would bring to down to the 1ohm load range and below. And thats kinda hard on even a RF amp. I would recomment getting 2 more and wiring them series-parellel.
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I would love to get 2 more, but I have know Idea where I would put them... Im not sure my trunk is big enough for three. By the way... This is a daily driver, so I need to retain some trunk space. :-) What if two of the 12's are 4ohm, and one is 8ohms???
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Posts: 305 | From: Brooklyn, New York, USA | Registered: Aug 1999
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How do you have it wired now? You should be getting big power out of that amp right now. 2 4Ohm subs in parallel would give the amp a 2 Ohm mono. Build a ported box for it and you will be happy.
I don't know why you would want 3 subs the wiring would not work you would get either .75Ohm or 12Ohm. And 4 subs would give you less power out of the amp but the surface area advantage would give you a slight edge over the loss going from 2Ohm mono to 4Ohm.
I would stick witht the 2 you have make sure you have it wired 2 Ohm mono and port a box for them. JMO
------------------ ******************* Founder: Street Sounds Car Audio Club ******************* If It Don't Read 150+ it Ain't Loud......
Posts: 289 | From: Howell, MI | Registered: May 1999
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alright folks one thing youre forgetting is that ohms arent constant they change I.E the rockford triple ten enclosure runs right at 4 ohms in its freq. range.... and they have 3 4 ohm subs in it i think double check to make sure but the amps always work with this setup no theyre not 12 ohm subs or anything like that i THINK theyre 4 ohm... all 3 of them
------------------ Punkin out with a killer system. sXe all the way!
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We'll even though you are right about a speaker being a changing load. I did not forget about it. The manuf. rates a speaker at a nominal load. Which for music listening is what you should go by. If your setup is for SPL only I would take into account impedence rises at your note, and wire for most power.
And the Triple 10 box has 3 8Ohm woofers in it with a nominal of 2.67 Ohms. It doesn't have 3 4 Ohm subs. That would not work in a normal case with their amps.
By the way, the box plays a huge role in the impedence of the sub. So a good box speaker combo is a key to getting the most power from an amp.
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