Sub Differnce
hey guys,
I am looking at getting a pioneer sub for my car but i keep seeing two different models of the same sub. a 2 ohm one and a 4 ohm one.. well what part do the ohms play, is there going to be much difference between them and what would be better. cheers guys.
I'm assuming there is a Fairly big price difference between the 2 and 4 ohm sub?
Look at your amp it should say:
For eg. 400rms @ 2ohm
200rms @ 4ohm
thought this would help you also -
dual2 ohm voice coil in series = 4 ohms
dual 2 ohm voice coil in parallel = 1 ohm
dual 4 ohm voice coil in series = 8 ohms
dual 4 ohm voice coil in parallel = 2 ohms
you need compare it to the amplifier that you have. If your ampputs out the most power at 2 ohms, you'll want the 4 Ohm subwoofer . If you amp puts out the most power at 1 ohm or 4 ohms, you'll want the 2 Ohm subwoofer .
Last edited by Timmos; 10-12-2008 at 02:01 PM.
ah ok well i just looked and the amp says 230w at 4 ohms and 340 at 2 ohms... so i want a 4 ohm sub, is that correct?
sorry i don't know what i was thinking - i was under the impression you mensioned dual voice coil.
Best bet would be is post us your specs of the amp and the sub and match them up as best as possible.
ok then well i will grab the specs and what have you and post them up when i get a chance... am stuck at work atm
The Pioneer subs that come in different impedence configurations ARE dual voice coil, so you were correct, Timmos.
If the amp says 340 at 2 ohm, then go for the TSW307D4 and wire the coils in parallel (+ to + and - to -) then connect the amp to one set of the terminals.
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assuming the amplifier will actually happily operate at 2 ohmsOriginally Posted by StoneX
just because it says it can, doesn't always mean it will.
If it's a name brand amp, they won't put a 2 ohm rating if it won't do it. They do actually test their products to find those power ratings.
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All else being equal, and amp which is 2ohm capable will put out more power at 2ohm than 4ohm.
You won't notice any difference in sound quality though if that's what you were getting at?
hey guys... ok i got the specs for the subs and what not... also turns out that i got the specs wrong for my amp. But yeah stonex they were the ones i was looking at... so yeah anyway my amp at 4-ohms is 300x1 and at 2-ohms it is 450x1. As for subs I have been looking at a JBL GT512 which has 1100w max and 275w rms which has 4-ohm independence. I have also been looking at getting a Pioneer TS-W307D2 or D4 which has a 1200w max and both the 4-ohm and the 2-ohm ones are 400w rms. The pioneer subs are $40 more and i am leaning towards getting one of them. But what would be better? And so there is no difference in quality with the 2-ohm and 4-ohm ones, like one isnt clearer than the other and stuff?
I'd be gettin the 2Ohm Pioneer one.
You have power to burn at 2 ohm... Make use of it with a 2 ohm sub, which is the TSW307D4. The D4 means dual 4 ohm voice coils.
go the pioneer, they are well proven subs
Custom Car Stereo Systems
Can i suggest going with the Pioneer sub?
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wow! that was like the most useful post ever!
lol yeah i think i will get the pioneer sub then lol i will be going to adelaide some time next week so i will try and pick one up then.
But can someone explain this to me... confuses me a bit.. like how does dual 4 ohm voice coils equal 2 ohms?
Custom Car Stereo Systems
Basically, when you join two voice coils together in parallel (+ to + and - to -) it halfs the impedance. So if youve got two 4 ohm voice coils you get 2 ohms.
If youve got two 2 ohm voice coils and join them in parallel, you get 1 ohm.
What this does is allow you to extract the most power out of an amplifier. Impedance is basically resistance, the less the resistance on the amplifier, the more power it will produce (in general).
Hope this helps, and didnt confuse you
Ah ok that helps heaps and makes perfect sense... cheers for that.
wow they are heaps helpful... cheers mate
well that was an even more useful post, good work
Just made a phone call and i should be picking up a Pioneer TSW307D4 late next week. Cheers for your help guys.
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EDIT: Nevermind found my answer elsewhere.
single and dual voice coil subs?
good link if you want to know about voil coils
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Electrical impedance, a measure of opposition to frequency varying electric current in an electric circuit.Electrical resistance is a ratio of the degree that an object opposes an electric current through it, measured in Ohms. Impedance is very different to resistance. But as a rule both do oppose current. A speakers dc resistance is very different to its impedance under load. If you measure the resistance from a multimeter of a speaker and then move the cone by pressing it in with your finger you will notice a significant change to resistance. As in dc resistance, because a speaker is supplied with an ac signal its resistance is called impedance because it opposes current depending on the frequency of the signal.
Back to the topic, the main reason why a subwoofer has 2 voic coils is because the subwoofer can dissipate heat more efficiently than with just one coil. THus making it more efficient because with any conductor the resistivity rises with heat. With a rising resistivity the woofer needs more power to produce the same amount of loudness when hot. The design of the woofer and its ability to dissapate heat thus keeping the resitivity of the copper voic coil to a minimun recommended. A more efficient woofer is more reliable and has a lower chance of thermal deconstruction. There are basically two outcomes when deciding on a woofer, SPL ie; loudness of bass or SQ as in quality sounding bass. Generally most people will load up an amp to 2 ohm from there woofer/s. Which generally give you the bang for the buck your after. In my experience, and im sure others will disagree, running a sub a 4 ohms sounds better but you dont get louder bass. And dont get me wrong i have heard a lot of 2 ohm setups that sound fantastic.
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