We’re often asked the question “what is better, a 2ohm or 4ohm subwoofer?” To answer that question, we’ll need to start by asking what’s the difference between a 2ohm subwoofer and 4ohm subwoofer?

Technically, they are different in only a few areas and that is:

- How much they cost.
- 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.

## 2ohm

When picking subwoofers, you’ll look at the ohm, the SI unit of electrical resistance, this indicates to you the amount of power that the subwoofer will be able to hold and the amount of power it can transform into sound.

A subwoofer with a lower electrical resistance produces a louder sound than one with a high electrical resistance, which means that 2ohm subwoofers are louder than 4ohm ones.

Although louder, 2 ohm subwoofers are also more likely to produce a poorer quality of sound due to its’ power consumption.

## 4ohm

4 ohm subwoofers will have a higher electrical resistance, use way less energy and will, therefore, last longer than subwoofers with lower resistance.

They also produce less sound in comparison to the 2 ohm ones. However, the sound produced could be described as being more compact so the sound you get from it is a much better quality than the 2ohm subwoofers but not so much as to be easily noticed.

Depending on the brand of the subwoofer you choose to purchase, the price could range between $20 and $180.

## What’s better, a 2ohm or 4ohm subwoofer?

The biggest difference is in their prices, but this also depends on the brand and size of subwoofers you choose. A 2ohm subwoofer would be pricier than a 4ohm subwoofer, a 2 ohm subwoofer would range between $50 and $200 depending on the brand you choose to purchase.

There is also a difference of about 2.5dB between a 2 ohm and a 4 ohm subwoofer which some may be able to notice while others may not.

The difference between 2 ohm and 4 ohm subwoofers is not great and they will produce a similar quality of sound if run in the same wattage. 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.”

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

https://m.youtube.com/watch?v=omK1eyFqc08

Please refer this link he dyno tests it and shows the actual output. It’s real output at 2ohms is less than 300watts.

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?

Amplifiers usually output power based on the impedance of the sub. So if the sub is 2ohms and the Amplifier is rated for 200watts if you connect a 4ohm sub it will output 100watts to the sub. But it is not an issue. There is only a problem if you connect a sub with lower ohms like 1 ohm, then the amp will start to heat up.

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

I am looking to purchase a Rockford Fosgate T1500-1bd and 2 fosgate p312 not sure if I should go with 2ohm or 4 ohm subs? I will be putting this setup in a fox acoustics dqc 212-v box under the rear seat of my 2017 ram 1500 quad cab. Please help. I am also contemplating going with either (4) 6×9 for the doors and (2) 3.5″ for the dash. I was wanting to do infinity kappa series however a friend of mine said I should do fosgate power series any suggestions? These will be powered by a fosgate t400-4. Thanks for your time and effort in helping me resolve this audio build delema.