Question about Rockford Fosgate Power 1500BD Car Audio Amplifier

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Wiring diagram i have three 15" 4ohm dual voice coil subs that i want to hook up to my 3200watt hifonics colossus amp. i would like to know the best way to hook them up with out my amp getting hot or my clip lights flashing while producing as much power as possible. and also do have to bridge the amp??

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  • damienweekly Jul 22, 2009

    its a 2 channel d-class mono amp 3200 watts hifonics colossus xxv

  • jephead May 11, 2010

    is it the 2 channel or mono ? - what is the model number of the amp ?

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X2: wire all subs in series, then parallel them together, that should gv u 8 Ohms per sub divided by 3 for a total resistance of 2.33 Ohms. Run the amp in bridged/mono configuration for max power output. The amp should handle this load without overheating! Verify that the amp can handle the 2 Ohm load in bridged mode.

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Diagram 1500bd

Posted on Sep 03, 2011

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Run them in sereis hooking them all up together and bridging the amp

Posted on Jul 22, 2009

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How to hook up 2Infininity dual voice coil speakers with coils and speakers wired in parallel to a Hifonics BRZ1200.1D 1200 watt super D-Class amplifier?


Wiring the voice coils and speakers both in parallel like this:
http://imgur.com/furO9yh
will be stable at 1 ohm mono.

Wiring the voice coils in series and the speakers in parallel like this:
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Will be stable at 1, 2 or 4 ohms mono

I'm guessing ur subs are 4ohms by the way

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Bridge at 4ohms your only getting 600watts rms. You will need to bridge at 1ohm (parallel) and adjust the gain accordingly. This will give it 1600 watts rms. If you would of had a dual 4ohm sub, then you could of bridged it at 2ohms mono, but you can't you have to go either 1 ohm or 4ohm. I believe it's not getting enough power.

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Ok, your post has two different models listed. Let's start with something you need to know about your amplifier. Is it one ohm or two ohm stable. This will make a difference. Also, whether your subs are single voicecoil (HFI12s4) or dual voice coil (HDI12d4).

Let's start with the easy scenario. Let's say your amp is two ohm stable and you have two single voice coil subs. It's simple. You go from the positive of the amp to the positive of both subs and the negative of the amp to the negative of both subs. This will provide a 2 ohm load to the amplifier, thus pulling all the power out of it.

Unfortunatley, if you have two dual voice coil subs, you won't be as efficient. You will only have the options of a 4 ohm load or a 1 ohm load.

This is where having a one ohm stable amp would come in handy. If the amp is one ohm stable, hook the positive of the amp to all 4 of the positives on the subs, and hook the negative of the amp to all 4 negatives of the subs. This produces a 1 ohm load.

WARNING!! If you have a 2 ohm stable amp DO NOT use the last wiring scenario. It will fry your amp.

Now, the last is a little trickier. This is for two dual 4 ohm subs. Follow closely. Hook the positive of the amp to one of the positives of each sub. (do the next step to both subs) Go from the negative of the voice coil that you hooked positive from the amp is hooked to, and hook that to the positive of the unused voice coil. Then go from the negative of that voice coil and hook to the negative of the amp. Make sure this is done on both subs. This will give you a 4 ohm load.

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I just needed some help with wiring my p8002 rockford amp to 2 fosgate 10 inch subs i just bought. there 4 ohms a piece and dual voice coil. i dont know much about car stereos but people keep telling me...


Well i tried looking up that amp, but Fosgate sight is down. So assuming that the best power out of your amp is 2ohms off the bridged hookup, and the subs are 4 ohms per coil, the best way is to only use one side of each speaker and hook it straight the the bridge. Only using one hook up wont hurt anything, its just for giving you wiring options. And when adding up ohms of speakers, it goes like this. If you had two 4 ohm subs, that'll give you a 2 ohm load. If you hooked up all your hookups, it would be like having four 4 ohm subs, and would give you a 1 ohm load.

judd0081.jpg

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Hello chino2g,

For 3 DVC 4 ohm subs wired to a 2 ohm stable amp, your best option would be to wire all of the sub voice coils in series (individual 8 ohm loads) and then parallel the three subs for a final load of 2.67 ohms. There's really no other configuration. Here's the wiring diagram:

http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=3&woofer_imp=4

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