I am building my own system, but don't know a whole lot. I have been reading and studying, but have a question. What is the difference between a dual 2 ohm sub and a dual 4 ohm sub? My JL 6600 amp is rated at 75watts RMS @ 2 ohm. All I want to do is bridge channels 5 & 6 to drive 1 sub, but I don't know if I should buy a dual 2 ohm or dual 4 ohm.
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4x4 ohm voice coils can be configured to either run @ 1 ohm, 4 ohm or 16 ohm, while the amp needs to be dropped to 2 ohms, no lower, to be most efficient. if a single dvc sup could handle 1200 watts, then hjust run 1, with both coils positive and negative inputs connected to the amps output. if you needed both subs, you would lilely only get 600 watts, by creating a 4 ohm load by running both speakers to the amp positive to 1 ccoil, each speaker, an mjumper cable between the negative of 1sdt clils to positive of 2nd coins, and running both 2nd coil negatives back from both speakers to the amp negative. the 2nd wscenerio will result in less sheer wattwage, but will also provide cleaner power. you need to study ohms law and parallel versus serial wiring to accomplish the 2nd scenerio, or, just get 2 4 ohm single voice coil speakers that can handle 600 watts apiece.
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.
first you dont bridge both ,, 2nd you will need to find out what ohms your speakers are , and if dual coil what ohms each coil is ,, then find out what ohms your amp runs at , at full power.. then try to match your subs to the same ohm load,, REMEMBER there are diff ways onto how to hook subs on which will change the ohms.. good example 1 dual coil sub each coil is 2 ohms then you can hit a 1 ohm or 4,, depending how you hook them up .. When adding more subs and how you hook them up changes the whole game.. if your not sure on how to hook them up read a manual or go to a local shop you can burn your subs up or worst the amp if hooked up incorrectly ..
they are dual 2 ohm all L7 are 2 voice coil per speaker so it is like 2 speakers not 1 the dual 2 ohm version is so you can use 2 speakers wired in series to get a 2 ohm load 2 ohms + 2 ohms = 4 ohms then parralel the 2 at the amp to cut it in half to get 2 ohms. I have full warranties on mine and i dont really sell alot of them any way I prefer the hifonics they sound better last alot longer and take way more power and put out 3 times as much sound. but i can check it out if you have the info.
Second, I don't think I would recommend mixing n' matching the subs. One of the subs would always be working harder than the rest. If you want to run multiple subs, make them all the same. Sometimes, you can get away with it if they are all the same voice coil impedance, but in this case you've got dual 4 ohm, dual 6 ohm, and single 8 ohm subs all in the mix.
If it were me, I'd probably stay with the single 15w6. But it's your money :)