- 1 decade agoFavorite Answer
An ohm is simply a unit of measurement for its level of resistance to electrical current flow. Ohm' s with speakers tell you how to wire them together, and to an amplifier. Therefore you have to consider it when deciding on compatibility to find an amplifier to power your speakers.
- MitchellLv 51 decade ago
A subwoofer is a big speaker used for bass responses. The 12" is the diameter of the speaker, while bigger the diameter stronger and deeper the sound.
The 4 ohms is the value of the impedance of the speaker. Imagine it this way. Whenever a electrical current flows through a material is has some friction opposed to the flow, it cause the component to get hot since the energy loss is transferred to heat. An electrical stove is practically a piece of metal which impedance is so high that causes the metal to get very hot which you use for cooking.
In amplifiers and speakers this number is very important since it will determine the power output of the amp, since they have different power rating at different impedance. A very low impedance can cause the amplifier to malfunction since the power increases directly, and high values of impedance produce lower power output but better sound quality.Source(s): 10 Years of Xperience Electrical Engineer
- cplkittleLv 61 decade ago
a 12" diameter speaker whose voice coil has a resistance of 4 ohms.