One way or another I ended up w/ an extra eu-700 dual 4 sub. I've got an Elemental amp pushing two of these at 2ohms per channel. I was thinking that I might be able to wire all three and bridge the amp to run them on a single channel. The problem is that it requires a minimum of 4ohms when it's running bridged. How can I get close to that number and is it dangerous to wire each speaker differently, e.g. one parrallel and another in series? Thanks.

 

This is kinda tricky since you have dual voice coil subs.

You also weren't clear about your [4 ohm minimum] statement. (1) Are you saying that the amp prefers to run at 4 ohms and will run 2 ohms stable? (2) Or are you saying that you can't drop below 4 ohms?

I could only assume you referring to option (1). If this is the case, the only option I see (In either case) is to do this: Connect a positive on only one voice coil of a sub to the positive on only one voice coil of the other two subs. This will be your positive lead to connect to the positive terminal of the amp.

Now do the same thing with the negative on the second voice coil. Connect the negative on (the opposite side) only one voice to the negative on only one voice coil of the other subs. (Remember - opposite the voice coil the positive wires are connected to.)This will be your negative lead that connects to the negative terminal on the amp.

Finally, cut three single wires and connect the negative of the first voice coil to the positive of the second voice coil. Do the same for the other subs.

So in essence you're running all subs in series for it's respective voice coils but connecting each sub to each other parallel. With this setup you'll be running 2.67 ohms. Be sure you amp can run 2 ohms safely before running your subs this way. If not this will eventually fry your amp. Any other option would probably sound worse than your current set up or worse may cause you amp to continually go into protect mode. This is just my opinion which by the way I developed when I used to manage a car audio shop. Hope this helps.

So it will look something like this:

 

So seriesing each 4-ohm pair of VC's will essentially make each woofer an 8 ohm SVC driver.

Paralleling three 8-ohm loads gives you 2-2/3 ohms per Ohm's law - NOT something most amps want to see in bridged mode.

 

To specifically answer your question, if you parallel some VCs and series others to get the load higher than 2-2/3 ohms and lower than 6, some VCs will "see" more amp power than others.

I wouldn't do it. I'd either replace your amp with a mono amp that can handle 2-2/3 ohms, or I'd ditch your plans for the 3rd woofer.

 

Thanks for the info guys. Sorry that I wasn't more clear. The amp wants to run at a minimum of 4ohms in bridged mode. I pretty much came to the conclusion that I'd either need to get a different amp or keep the 3rd sub as a spare. Since I just bought the amp I'm going w/ the later of the two options. These two subs sound incredible as it is anyways. Now I just need to upgrade the stock 6" speakers and tweets.