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#1
04-03-2003, 07:22 AM
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Anyone?
Is there anyone here running 4 ohm 12" JL w0's? If sowhat size of amp r u using. I have 2 in a sealed box, and am not sure what size or what setup to go with. The subs ARE dual voice coil. Which setup would be best, parralel or series? Also would i need an X-over?
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#2
04-03-2003, 11:18 AM
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bumpity bump
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#3
04-03-2003, 12:31 PM
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It all depends on the amp.
If you hooked each set of voice coils up in series, you would have two 8 ohm speakers. then hook each speaker together in parallel and the amp bridged, you are now running a 4 ohm mono load, which on a non compeition series amp is the best configuration since it is using the most effiecient power. ideally, if you had an amp that was 1 ohm mono stable or so, you would want to parallel each set of voice coils (two 2 ohm speakers), and then parallel each speaker bridged at the amp. This would make a 1 ohm mono load and put out mega power, but most amps cant handle this. You cna also hook up any amp as a 2 ohm stereo load by hooking up each set of voice coils in parallel and then running those sets each off of one channel of the amp. a 2 ohm stereo load is the same wattage as a 4 ohm mono load, only the mono load is bridged so its making more effiecient power. If you have a run-of-the-mill amp, 4 ohm mono load is what you are looking for. If you have a competition series amp, run the lowest ohm-age possible. Part 2: You will need a crossover unless you have a bandpass box which you do not. You will want to set your lowpass crossover @ about 120hz or so depending on what type of music you listen to.
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#4
04-03-2003, 12:36 PM
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If you need help, here is a link that explains it in better detail:
http://www.eatel.net/~amptech/elecdisc/spkrmlti.htm
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#5
04-03-2003, 01:38 PM
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so wut ur saying is that i need a x-over if i want pure bass?
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#6
04-03-2003, 05:21 PM
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yes. a crossover is necessary on subwoofers unless you have a bandpass box which you do not.
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#7
04-03-2003, 07:17 PM
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lots of amps now come with built in hi/lo-pass filters, some even variable, and you still need a crossover on a bandpass box. and the crossover point depends entirely on your configuration.
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#8
04-03-2003, 07:27 PM
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so u dont need a x over with sum amps?? or should i go pick one up anywyas?
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#9
04-03-2003, 08:09 PM
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depends on the amp. if the amp says it has a built in crossover or a low-pass filter built in, then you don't need one, but otherwise you will.
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#10
04-03-2003, 08:18 PM
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iight sweet, this has helped me out a ton, my next problem is figuring out what setup i need, but i guess it wont matter till i get my amp. Would a 400 watt 2 channel amp run the JL 12"w0's good? i think their rated at 125 RMS
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#11
04-03-2003, 08:58 PM
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yeah, keep the gains low on the amp. JLs tend to be able to take a little more power than they are rated at. but if you hear the subs distorting, turn it down.
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#12
04-03-2003, 10:14 PM
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you dont necessarily need a crossover with a bandpass box. The box deesign itself works as a crossover. Its still a good idea to have a crossover so the voice coil isnt receiving signal that it cant reproduce, but technically, you dont need a crossover. the box has to be tuned, thus working as the crossover.
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