I have a 8 ohm 10 inch sub I want to use in my car.. can an 8 ohm speaker be used on automotive amps? instead of a 4 ohm.. all thats talked about is 4 or 2 ohms.

 

Yes you can use it. Your amp won't put out as much power though.

 

connect both +'s from each sub together and both -'s then connect that wire,( a single + and _ ) to your amp bridged. You'll have a 4 ohm bridged load.

 

As far as I can tell there's only one sub.

 

duh, ima dope

 

Thanks AJ_92RS, ya.. It's not a dVC.. just a single..

 

Hey, I have a Rockford 12" 8ohm sub. Its the HE series. And I have a rockford 200w amp. It sounds like crap together. I have it bridged and it barely runs it. I tried to connect both +'s and -'s like you said..but, I just kept blowing fuses as soon as power would go to it.
What could I do?

 

is it svc or dvc? If you wire it like i said you shouldnt blow fuses at all.

 

Typically, if your rockford amp is a 2 channel amp, there should be a way to bridge the amp by connecting the positive lead from the sub to the positive lead from one channel, then connecting the negative lead from the sub to the other channel. There may also be a switch you have to move as well.

Usually, when you bridge an amp, it will half the load. So your 8 ohm sub will act like a 4 ohm sub..

This might get some more power for you.

Mind you it is 6am at the moment, I am not awake yet.

I might even be wrong.

:lala:

 

Wiring two 8 ohm subs together to show the amp a 4 ohm load will make for good bass. Though I can't remember if this is series or parallel.

 

are there 2 places to hook up speaker wires (aka dual voice coil), or only one place (single voice coil)?

 

It'll work fine. You'll get 3dB less output than if you had a 4 ohm equivalent. It's no big deal.

 

Its a single voice coil

 

I was just wondering teh same thing today. I have the fosgate punch z 12" 's i bought a few months back. I already had a 301s fosgate 900watt amp and the guy said the 4 ohm subs would toast the amp and that i had to run the 8 ohm subs. Is this true and then would it be ok to bridge them into the amp so that it would think its a 4 ohm or could that trash the amp. Or maybe jim's right and i shouldnt bother worrying about it casue 3db won't even sound much different. Box is built subs are going in as soon as i wire everything

 

3dB is not much loss in output?....since when?

it will work, but there are better options.

I think you are confusing SPL with power loss, 3db SPL is not that much, I agree.

3dB loss is......well, half of your power....in WATTS

in this situation it is indeed 50% loss in output power from the amp.

 

Ya your right on that one.. But not worry then. I scooped up a good deal on a 10 inch JBL Sub instead..

 

Care to explain the difference?

 

who cares. You don't hear watts. You hear SPL.

 

well you were wanting to know if a single 8 ohm speaker would work with your phosgate amp and its yes. but its not going to put out even close to max out put until you place enough 8 ohm speakers in parellel to reach the amps max out put.If you have a two channel amp it is designed to be bridged.
(1) 8 ohms speaker = 8 ohm out put wich will probably put out about 75 watts max rms.
(2) 8 ohms speakers wired in parrellel =4 ohms should put out at least 100 to 150 wattsrms
(3) 8 ohms in a row = 4ohms your amp should put out max here this is what your amp was desinged to do easily
I believe that your amp puts out maximun wattage at 2 ohms but thats alot of strain to be running max all the time the amp will get really hot here.
If I was you I would get (2) 8 ohm subs and run it bridged positive to positive only tied together on the speakers not at the amp..run bothe out puts on the outside channels of the phosgate, on the far out put side you should have a negative to your left and to the far right you should have a positive only wire use them two outs to have your amp in bridged mode.
or run two 4 ohm speakers wired in stereo where you use all of the speaker wire out puts positive to positive negative to negative each wire independently ..if your not sure I can send you a diagram or pictures on how to do it. I used to get confused to how it works as well..

 

And obviously still are.

Three 8 ohm subs "in a row" (aka parallel) would equal 2.67 ohms, not 4 ohms.
8 ÷ 3 = 2.67 ohms.

Hooking one 8 ohm speaker bridged is the same load on the amp as running two 4 ohm speakers in stereo, so “output” would be the same. The benefit is the extra cone area of the extra sub will result in an increase of ~3 dB.

I have yet seen a Fosgate amp that is stable at 2 ohms bridged unless it was a mono amp.

It’s spelled “Fosgate”, not “phosgate”.

Getting two 8 ohm subs is the way to go, but they’re difficult to find anymore. Speakers with two 4 ohm voice coils wired in series seem to be the trend lately.

And Jim,
Since when is a 3 dB gain no big deal? AFAIK, that’s equivalent to doubling wattage, or adding another speaker.

Next you’ll be saying an extra 25 HP is no big deal.

 

yes (3) 8ohm speakers does = 2.66 ohms oops my bad ... but you never did say what type of amp you had to push your woofer I just took your input for granted that you would be using a mono amp for your lows and seperate amps for your highs but then again thats the route I took.
If you have any high end stereo shops in your neck of the woods you should be able to order you an 8 ohm kicker but its not going to look the same because the c 10's are a little out dated .
But if you would like some dementions on building a box for your C 10 sub
-using a compact enclosure of 1.25 cu. feet @125w rms you should acheive 90 to 93 decibals
-using a street bass ported enclosure of 1.5 cu.feet @125 w rms
1.5 cu. ft.+port 1.5x10.5",port 13.5" long between 92 to 95 decibals.
-a deep base enclosure has it all it is the highest effecieny and hits the lowest of all boxes and its 1.75 cubic feet wich you can try with or with out port . 1.75cu ft.+port 1.5x10.5"port 13.25"long @ 125 rms =93 to 95 but this one should hit all the frequencies...
but hey you dont have to trust me...I can barely spell..lol
Im running 2x 12" kicker comp cvr 4 ohm dual voice coils in my gta with a rockford 200x 2 bridged with one microfarad cap for that amp alone two rockfords 400x4's running my mids with one micro farad cap off bothe of them. my mids consist of 2 horns,2 4 1/2" kicker coaxials, 2 5" mb quart coaxials, 2 mb quart 6x9" 3 ways, and 2 mb quart satellite highs

 

I didn't say that 3dB wasn't a big deal. I said double the power isn't a big deal. Granted the two go hand in hand, but the point I'm trying to make is that as long as it goes loud enough to make you happy, it's silly to worry about maximizing power output from the amp. The extra 3dB is nice if you can get it, but it's not a big enough difference to get all worried about.

I had a buddy who wanted to upgrade his stereo. He had a friend selling a Kicker 652i impulse amp and a single JL 12W0. I told him that stuff would work great so he got it. Turns out that the JL was an 8 ohm sub. That kicker amp is a low power amp to begin with, and pushing an 8 ohm sub is only going to make around 130 watts of power. I was skeptical to say the least.

Once I got it all installed, I discovered that it was a lot louder than I had expected, and he's as happy as a clam. Best of all, he got what he wanted without taxing the hell out of his electrical system. The JL sub isn't as much of a power hog as other brands/models out there, and in the box I built it gets plenty loud.

 

I think you are confusing SPL with power loss, 3db SPL is not that much, I agree.

3dB loss is......well, half of your power....in WATTS

--------------------------------------------------------------------------------



Care to explain the difference?


.........No, not really

No disrespect to Jim, I think he knows what I'm talking about.......even though you don't HEAR watts. Jim, you're right 100%, come to think of it, I have never heard a watt myself.

"Hooking one 8 ohm speaker bridged is the same load on the amp as running two 4 ohm speakers in stereo, so “output” would be the same. The benefit is the extra cone area of the extra sub will result in an increase of ~3 dB. "

if you say so...

 

I won't trusty you because you have no idea of what your talking about but thats for another post and another time. Please NEVER give out box recomendations again.

 

I read his post three times and im still shaking my head.

 

Read some of his other posts. There good.