Let’s start by saying watts and ohms are all part of a series of mathematical formulas that put them together such that when one of them changes in value, the other often does too.

**A brief explanation taken from Crutchfield: **

*“Amplifiers provide the electrical pressure in a circuit; ohms measure the resistance, or load, against that pressure; and watts measure how much power is released as work. So, using one of those math formulas, an amplifier that provides 100 watts of power through a 4-ohm speaker, will produce 200 watts through a 2-ohm speaker, because it’s easier to push that reduced load.”*

**What’s the difference between a 2 ohm subwoofer and 4 ohm subwoofer? **Technically, they are different in only a few areas and that is:

- How much resistance one can get,
- How much power will pass through your subwoofers,
- How much dB (logarithmic unit to measure acoustics) they can produce.

## Extra Information

### Mad_Eyes

What’s the difference between dual 2-ohm voice coils and dual 4-ohm voice coils?

### Cooper

It just gives you two options to choose from when you purchase the subwoofer, each one will be better/worse for a given type of amplifier. Each voice coil has a +/- terminal for wire to plug into, so you wire it sort of like it were two subwoofers .

The question is, do you run the power from the amp, through the first coil, then through the second coil, then back to the amp (wiring in series) or do you split the power wire and run it through both of the coils at the same time (wiring in parallel) . If you wire in series you add the ohms (impedence) of each voice coil to get your total ohms . If you wire in parallel its, often, half of the impedence of a single voice coil that becomes your total impedence .

So …

Dual 2 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 .

Since they make two difference versions of the subwoofer, that gives you four options for hooking it up (with one speaker) . To pick which one is best for you, you just compare it to the amplifier that you have, or the one you intend to buy, for the speaker . If your amplifier puts out the most power at 2 ohms, you’ll want the Dual 4 Ohm subwoofer . If you amplifier puts out the most power at 1 ohm or 4 ohms, you’ll want the Dual 2 Ohm subwoofer .

That’s basically all it is, gives you options to make it easier to pick a matching amp .

Q. What is the power difference between ohms? Let’s say 400 watts at 8 ohms, & you put a 4 ohm cabinet with it. What percentage of added power is there? 30%, 40%? Does it change with different ohms? ie: 16 to 8, 8 to 4, 4 to 2?

Thx Frank

is a boss elite 1500 watt

2ohm monoblock amp too much power for 1 10″ Memphis shallow 300watt sub

I have a single voice coil sub that is 4 ohms and 150 watts rms and 300 peak power, i am running it on a class a/b boss audio 4 channel 400w peak power 2 ohm amplifier, it seems to be a bit weak. Will running the 4 ohm single voice coil sub on a 2 ohm amp be related to my problem?

I upgraded a little I had anew planet audio head unit the bells and whistles are there great price so I got a Rovkford fosgate r600x5 and 4 6.5 165×3 way speakers here’s the catch It’s an old car had ok speakers so used a wire harness I think I’m going to have to run wire from the ampto the speakers think so