i hope that you guys can help me out with this.

wats the diff between a 2 ohm & 4 ohm's subs?

and i also guess that it will make a diff with the type if amp i have, right?



thanks in advance

 

Maximum power transfer occurs when you match the subs' resistance to the amps.

So, 2 2ohm subs in series = 4ohm.

 

4-2=2 ohms

Seriously, you need to look up ohms law to better understand it.

If you want to run two subs, and they have one voice coil each, i recommend the 2ohm. if they are dual voice coil, i recommend 4 ohms. put all the coils in parallel to achieve 1 ohm, which i am sure that almost all monoblock amps can handle. if you plan on more speakers than that, please do some careful planning and research to come to the best combination.

 

Learn to love this site:

Basic Car Audio Electronics

 

thanks guys for the fast response.

and im gonna bookmark that sire noir06

 

Ohms is the resistance of the sub. You need to match the subs up to the amp to get the most power out of it. Here are the specs for my amp:

RMS Power measured at 12.5 Volts DC:
37.5 watts x 2 into a 4 ohm load
75 watts x 2 into a 2 ohm load
150 watts bridged into a 4 ohm load

So my amp will run 2 4 ohm subs at 37.5 watts each, or 2 2 ohm subs at 75 each, or 2 4 ohm subs at 75 each, or 1 4 ohm at 150 watts. So to get the max power out of my amp I want to run it with 2 subs (2 ohm or 4 ohm, depends on how they are wired up) or 1 4 ohm sub.

 

Resistance is futile!

The main reason for smaller lower resistances is due to the low voltage of the car's power supply - just 13.6 VDC. The car has little voltage but lots of current and volts times amps (current) equals watts (power). Given the challenge of raising the voltage or drawing more current the amplifier manufactures choose both using DC to DC converters to raise the DC power supply rail while drawing all the current they can manage. The lower resistance of the speaker allows the amplifier's power transistors to supply the maximum amount of current (and that means max watts).

 

THANK YOU FOR THAT!!!

I have recommended this site for years. It is probably one of the most informative sites for anything car audio related.

 

VO(chuckled)

 

ohm's is a big deal but voice coils are even more important for getting the lowest ohmage and the most power.

Best bet for subwoofers is to get an amplifer that is a monoblock or 1-ohm stable amplifier. That way if your ohm and voice coil combination for your subs can be wired down to 1-ohm you will get the maximum out of your amplifier and the most bang for the buck out of your subs.

only downside is that your amp gets really hot like that, so best not to play it full blast for hours on end, give it a rest every now and then.

I currently have 2 4-ohm DVC subs wired down to 1-ohm on a 3000-watt monoblock 1-ohm stable amplifier and it hits much better then when each sub is wired seperately or when you don't connect the voice coils.

Your best bet is to get 4-ohm dual voice coil subs as they have the best combination of wiring options and ultimately can be wired down to 1-ohm which I mentioned was the best way to get the most out of your subs and your amp, if it can handle it

 

I absolutely LOVE "internet misinformation"!

 

Our Physics professor in 9th grade said exactly that during a lecture once and no one got it for a second; he had to pause and look up before everyone burst into laughter. Good line!

 

VO(gets the inside joke)

 

Yeah, sometimes I read some things and just slam my head down on my desk.

 

Agreed. All I can say is "WOW" to some of this....

To the OP, it sounds like you're willing to read and learn for yourself. That's an excellent start. Just don't rely on a car forum for the most uhhhh....accurate information on this subject.

 

The DISADVANTAGE of lower resistance speakers is that the damping factor drops with resistance. Current music isn't really that concern with accurate dynamics as opposed to say the maximum amount of sub-audible energy.

 

Meh...damping factor (and by definition ultra low output impedance of the amp) is WAY WAY overrated. But this is not the forum and certainly not the thread for that discussion. It's been debated to death elsewhere.

 

Unless Paul350Z says it. I'm above average when it comes to electronics, but not compared to Paul350Z. If he gives you advice/direction, I'd take it as the truth.

VO(gives props where props are due)

 

I'm sure there are good resources here and Paul350z sounds like one of them. My comments weren't directed at him.

Overall though, I'd still say that if you compare the discussions in car forums to the discussions in dedicated car audio forums like DIYMA you'll have a lot more disinformation on the car forums. Are there still knuckleheads on car audio forums? YES!! But the balance is much more in favor of quality responses.

 

You still will want to match the subs resistance to the resistance of the amp.

Take the amp as a voltage source in series with a resistor and the sub, which is a resistor.

So its a Vs, R1, R2. You want to get the most power out of R2. To do that, R2=R1 will deliver the most power to R2.