Question about Ohm

[Stian 10+ year member]

What happends if I have a amp configurated at 2 ohm (and let's say I must keep it that way), and a subwoofer with 4 ohm.

Does it work completely ok? Or what will go wrong?

Click to read more...

 

[Stian 10+ year member]

Okey, no one here doesn't know anything about ohm?

 

[squeak9798 5,000+ posts]

Well, I guess I don't know what you mean by "an amp configurated at 2ohm", and have a 4ohm sub. The amp isn't "configurated" to a certain load, the sub is the load. So an amp with a 4ohm sub wired to it has a 4ohm load on it. Now, if you mean an amp "stable" to a minimum of 2ohm, and you hook a 4ohm sub up to it, then the amp will output half of it's rated 2ohm output (unless it's like the new JL or PG amps, which have regulated outputs). So, an amp rated 600w @ 2ohm with a 4ohm load on it will put out ~300w.

 

[Johnny Drama 5,000+ posts]

less than 15 min??? come on be patient. Now, what do you mean amp is 2 ohm and sub is 4 ohm. If you run the amp at 4 ohm it will run fine but depending on the amp it will put out less power. the 2 ohms that your referring to on the amp is probably the lowest ohms that the amp can play safely. Any lower and you run the risk of frying the amp.

squeak you beat me to it. LOL

 

[Stian 10+ year member]

Okey, thanks.

Okey, here is the deal. Here is the amp:

Modelname: Kicker- KX700.5

Info:

Please try to see what you can get from this image:

(notice the modelname)

This amp will drive this:

System passive 2x12" bandpass subwoofer

Impedance 4 Ohm

Frequency spectrum 18-500 Hz

Nominal/musical power handling 350/700 Watt

Sensivity/Soundpressure level 94 db/W/m

How will this work? The sub has a peak at 700 watt. Is this within the range of the amps limitations?

 

[squeak9798 5,000+ posts]

@ 4ohm & 14.4V the sub section of that amp will output 210w, and at 12.5V it will output 180w. Peak power is meaningless; it's the 350w # that you want to look at. So that sub setup will receive ~210w when your car is running, and 180w w/ the car off.

 

[Stian 10+ year member]

So what you are saying, that the amp can not delivere enough power? (350)

 

[Scarenius 10+ year member]

That amp will push those subs just fine. In fact, it will power those subs, AND your speakers, because on top of being a sub amp, it's also got 4 other channels with seperate crossovers for speakers.

 

[Stian 10+ year member]

I know, it will power my other speakers.

But it's the sub im worried about.

Since the amp cant deliver the max-limit for the sub, it means that I cant force the max-sound out of the sub.. or?

 

[Stian 10+ year member]

Everyone died or does somebody know the answer to my question?

 

[Stian 10+ year member]

Bump..

 

[Norcalracer283 10+ year member]

Max wattage means nothing. Just look at RMS ratings....and yes, that amp will power them fine. Chances are those subs are over rated pos so giving them a little less RMS will be great.

 

[spicmonster 10+ year member]

i got a question..wat if u have a dual voice sub buut connect itr at 4 ohms ...how much power wouldit get>?

 

[Forty-Ouncer 10+ year member]

lol well dude it depends what the dual voice coils are.

are they dual 2ohm? dual 4 ohm?

I remember someone a while back posted a wiring thread explaining all this with diagrams. but heres the gist of it ill teach you really quick.

basically there are two ways of wiring your subs to your amp.

Parallel and series.

Parallel - if you had dual 2ohm voice coils(VC) and wired them in parallel it would cut the resistance to 1 ohm. thus dual 4ohm VC in parllel would be a 2 ohm load, and dual 8ohm VC would be a 4ohm load.

Series. if you had dual 2 ohm VC wired in series the resistance would increase to 4ohms. dual 4ohm VC in series would be 8ohm load and dual 8 VC would be 16ohm.

So what you gotta look at is your amps rating @ a certian ohm. SO for instance most amps are capable of a 2ohm minimum load. So in this cause you would want the final load of your subs appearing as 2ohms to that amp. So a dual 4ohm VC sub wired in paralell would work good. but if you want 2 subs then you would need 2 subs with dual 2 ohm VC which you would wire in series producing 2 subs with 4 ohm loads. THen with that you would wire them in paralell to get a final 2 ohm load to your amp! Of coarse there are aslo single voice coil subs which are easy to work with. So you might want 2 4ohm subs(which you would wire in paralell to get 2 ohms), or 1 2ohm sub

thats a lot of typing that may not have come out *** clear as it is in my head.

did you get it? maybe somone else can sum it up better. but my advice to you is to look in that wiring help forum for that thread. the guy posted pictures on configurations of multiple subs with differnet ohms and voicecoils.

 

[icemayne696 10+ year member]

Check this out Mess around with the configuartions on that....really helpful!