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ohms? on subs.

 
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Old 30 Nov 2011, 12:42 pm
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Default ohms? on subs.

I've got a pair of brand new old school rockford fosgate 8" series 1 subs. I got a rockford fosgate 150a1 mono amp. These subs are 8 ohm and 4 ohm. Will hooking these up to 2 ohm work even though they aren't 2 ohm. My amp is stable for 2 ohm. Just want max power from my amp. Or do i have to get 2 ohm stable subs. Thanks.
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Old 30 Nov 2011, 01:14 pm
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Default Re: ohms? on subs.

2 and 4 ohm subs and amps are for the most part standard. 1 and 8 ohm stability are usually reserved for a bit more expensive subs and amps.

I am currently running about a 500$ system.

170$ x2 for two Type-R 12" subs
40$ Box
50$ 1100 Watt Amp
100$ for the wiring kit.
Which equals 530$

Anyways with my amp... I have two dual voice coil subs that are 4ohms at 600 watts or 300 per voice coil. So I bridged the voice coils which brings them to 2ohm so I do the same thing and bridge my amp which brings it to 2ohms as well.

My amp is rated for 1100 watts at 2ohms bridged. So when broken down each sub is receiving 550 watts or 275 per voice coil. With that I am under powering my subs by only a 100 watts or 25 watts per voice coil.

It is all about checking what your subs and amp are capable of. As in my case my amp does not support either 1 or 8 ohms hence why I picked up 4ohm subs. Once you figure out what they are capable of you can use these wiring guides as reference. http://www.crutchfield.com/S-7IEOcN2...rs_wiring.html

Last edited by slayerdarkcross; 30 Nov 2011 at 01:32 pm.
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Old 30 Nov 2011, 02:01 pm
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Default Re: ohms? on subs.

So since my subs are 8 ohm/ 4 ohm i should hook up my speakers to 4 ohm. Was just wanting to get the most power to them by hooking them up 2 ohm. But they aren't 2 ohm. I want to hook em up on my mono amp in parallel for 2 ohm load but dont want to damage anything. Is it safe. Thanks.

http://www.rockfordfosgate.com/libra...1-84_88-ts.pdf

Last edited by fishkiller12672; 30 Nov 2011 at 02:19 pm.
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Old 30 Nov 2011, 05:14 pm
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Default Re: ohms? on subs.

I'm confused. Do you have one 4 ohm sub and one 8 ohm sub?
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Old 30 Nov 2011, 05:36 pm
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Default Re: ohms? on subs.

No they are both 4 ohm subs to run off my mono amp. Just learning about the ohms and such. Both speakers are either 8 ohm or 4 ohm depending on where i connect my speaker wires on the terminals. So if i run them both parallel at 4 ohms to my mono amp that will make 2 ohm. so my question is will this hurt my subs. Thanks,

Last edited by fishkiller12672; 30 Nov 2011 at 06:33 pm.
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Old 30 Nov 2011, 07:52 pm
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Default Re: ohms? on subs.

Im assuming they are single coils? Anyway, no wiring them either way won't bother the subs in any way, its the amp that does the work and requires the correct load impedance .

So if the amp can run 2ohm you will be fine either way but most amps provide more power at lower ohms (but work harder to provide it and can run hot)
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Old 30 Nov 2011, 10:02 pm
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Default Re: ohms? on subs.

Quote:
Originally Posted by fishkiller12672 View Post
No they are both 4 ohm subs to run off my mono amp. Just learning about the ohms and such. Both speakers are either 8 ohm or 4 ohm depending on where i connect my speaker wires on the terminals. So if i run them both parallel at 4 ohms to my mono amp that will make 2 ohm. so my question is will this hurt my subs. Thanks,
Looking at the link to the spec you posted. Your subs would be either 4 ohm OR 8 ohm. Not both. The only way to change the impedance on a single driver would be if it had dual voice coils. It looks as though yours are single voice coil. If they are 4ohm each, wiring them in parrallel (+ to+ and - to -) will equal 2 ohms. Wiring them in series will equal 8 ohms.
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Old 01 Dec 2011, 02:35 am
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Default Re: ohms? on subs.

Can you post some pictures of the subs please, so I can better understand what your talking about.

Even better. If you can post the models numbers on everything.
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Old 01 Dec 2011, 10:47 am
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Default Re: ohms? on subs.

Xwing sounds like i'll be ok then, I'll just keep an eye on the amp overheating. I know they aren't both ohms its either one or the other 4 or 8 depending on where i hook it up on my speaker terminals its the way it was built on these old school subs unless i'm reading something wrong. They are single voice coils. I'll be hooking up to 4 ohms in parallel to make 2 ohm load to my amp. Bassahaulics i put the link of specs on my 2nd post on my speakers. Like i've said before in the old days when i was a kid i didnt care about ohms and such i'd just hook everything up. Thanks for the input.

Last edited by fishkiller12672; 01 Dec 2011 at 10:59 am.
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Old 01 Dec 2011, 06:28 pm
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Default Re: ohms? on subs.

Quote:
Originally Posted by fishkiller12672 View Post
I know they aren't both ohms its either one or the other 4 or 8 depending on where i hook it up on my speaker terminals its the way it was built on these old school subs unless i'm reading something wrong.....
I'm pretty sure you are reading something wrong. If they are 4 ohm wiring them in parallel will give you the 2ohm load you desire. If they are 8 ohm it will only give you a 4ohm load. The amp you have is rated 75 watts @ 4ohm 150 watts @ 2ohm
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