Isobaric Wiring

I actually have two questions. First question is general. Here is my equipment.

Pioneer PRS-X720
2 ch: (4 Ohm) 100Wx2 RMS
2 ch: (2 Ohm) 200Wx2 RMS
1 ch: (4 Ohm) 400Wx1 RMS

Two Rockford Fosgate P215S4
250 RMS / 500 Max @ 4ohms.

now, would it be possible to use this configuration by bridging my amp?

Now, to my isobarik question. I am thinking of this configuration

now i am under the assumption one speaker, the polarities are matched and the other speaker, they are reversed. now would this be possible if my first configuration is valid?

Need some professional pointers. Thanks.

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Proudly stuffing large packages into small boxes since 1983.

sorry under impression the amp put out a 2ohm bridged load. lol. since it is a 4ohm load instead of 2 ohm, i should be alright.

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Proudly stuffing large packages into small boxes since 1983.

Your wiring diagram appears to be correct.  But a two ohm load is way too low for bridging to a two channel amp.  Your option would be to wire each sub to a separate channel, where the reversal of polarity on one sub can be made as well.  I recommend highly that you put that two channel amp aside for other purposes and instead use a mono amp for this sub setup.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

ok well, the amp puts out 400wx1 at 4ohms. now doesnt an amp become mono when bridged? and all the equipment i own are as follows.

1 - Alpine SWR1241D DVC 12" Sub
2 - Rockford P215S4 SVC 15" Subs
2 - Rockford P3002 Amps
1 - Pioneer PRS-X720 Amp

i got the two rockford amps on the inside speakers and it works wonderfully and i have the alpine wired at 2ohms running off one of the channels which takes 200w at 2ohm stable. i wanted to change the setup.

which brings me to another question... do i have any other options in wiring the Alpine?

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Proudly stuffing large packages into small boxes since 1983.

Yes the diagram is correct. The issue here is the stability of your amplifier. Because the amplifier says "2 ohm stable" on the spec sheet, does not tell you how it is stable. Your amp is 2 ohm stereo stable and not 2 ohm mono stable. It is stable to 4 ohm mono only, thus with the subs you have, your only wiring options are either 2 ohm mono or 8 ohm mono. The safe bet here if you are going to use this amp, is to series wire the subs to 8 ohm mono, which means that the wiring diagram would then be incorrect. 8 ohm mono is the same as running the subs in 4 ohm stereo as Stevdart mentioned above.

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Top Secret, I can tell you but then my wife will kill me.

Correct me if I'm wrong but isn't that box very difficult to built and has to be to exact specs or it'll sound like poop?

aznboi3644 wrote:

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Correct me if I'm wrong but isn't that box very difficult to built and has to be to exact specs or it'll sound like poop?

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"Poop" would be a kind word for it.

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This design was popular back in the late 80's, early 90's before rapid advances in speaker technology made this type of system obsolete. So I would add smelly to the descriptive context of aznboi's reply.

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Top Secret, I can tell you but then my wife will kill me.

lol, smelly poop. ok, advice taken. i just wanted to be a lil different. anyhow, wiring the speaker to 8ohms and putting it to the 4ohm mono load is ok, which was what i thought. now i would get more performance with that method rather than wiring the speaker 2ohms to one channel 200w @ 2ohms?

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Proudly stuffing large packages into small boxes since 1983.

Wiring both subs to one channel is a no no...will make your amp a piece of poop...smelly too maybe.

Either 8 ohm mono or 4 ohm per channel...same output though.

sorry, im talking about diff pieces of equipment. right now i am running the alpine 12 dvc sub.  i have it wired to one channel. i wanna know if it is possible to wire it bridged to the 4ohm mono load while the speaker is wired at 8ohms. is it equal or better than having it wired at 2ohms to a single channel?

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Proudly stuffing large packages into small boxes since 1983.

Not sure if thats possible since you dont mention which amp it is and if it is 2ohm stable while bridged. Assuming it is, 2ohms is 2 ohms. No matter how you run it, as long as it equals 2ohms its going to be the same.

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"People with mullets live 40% longer"   - Ricky Bobby

Ok well I am confused about what exactly you are running.

Pioneer amp or RF amp?

If its the pioneer amp than wiring it 4ohms to each channel would put out the same power as wiring the sub paralleled to one channel at 2 ohms.

I'd go with the 4 ohms per channel

ok im using the pioneer amp for the alpine sub. i would like to pull the most power from it. it is stable at 4ohms bridged. should i wire the DVC to 8ohms and bridge the amp?

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Proudly stuffing large packages into small boxes since 1983.

Either way you wire it, Each coil to a channel or parallel and bridging the amp, you'll get the same power output.

Thank you all for your help.

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Proudly stuffing large packages into small boxes since 1983.

No problem...tell us how it is after its all hooked up man.

Well, it is all hooked up. she sounds great. but it is in a ported box for two 12's, considering i blew the other 12" by having it bridged for 4ohm (amp)  to a 2ohm load (speaker). but the box is chambered so im getting good sound. i know the formulas for building a box so im gonna make a new one and tune the ports to where i want it. did enough research on building a box so ill post pics after im totally finished.

By the way, i just got back from the Funkmaster Flex Custom Car and Bike Show in Edison New Jersey today. It was sick.  Cars had fish tanks for headlights, 22 7" tvs; it was rediculous. im going to try to figure out how to get ALL the pictures off of my phone, which are resolution 1280 x 960.  Cardomain.com guys were there too.  all the fiberglass was insane.  guys were sprayin NOS.

Well anyway, thanks again guys.  Glad to be a part of the 12 volt community.

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Proudly stuffing large packages into small boxes since 1983.

Is it just me, or having fish tanks in your headlights is just plain stupid!! Sounds like something stupid West Coast Customs would do to me. Come on guys!! Im all about the custom work, but fish tanks and car audio just dont go together in my opinion!

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Alpine 9835, MB Quart components, (3) JL Audio 10w3v2, JL Audio 500/1, JL Audio 300/4, Streetwires wiring

Lol i agree....And yes it was prolly West Coast Customs.

lol, yeah thewse guys went a little crazy with a lot of these cars. im actually gonna email myself some pictures from my phone right now so ill post some up in a few.

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Proudly stuffing large packages into small boxes since 1983.

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Proudly stuffing large packages into small boxes since 1983.