What do the ohms have to do with subs?

Question

What do the ohms have to do with subs?

Answer 1

An amplifier is designed to deliver a power level to a speaker. It's a matter of match.. if the amp is designed to deliver "X" power to a speaker of 8 Ohm "impedance", then all the power sent to it will be dissipated in the load (speaker).

Answer 2

Your sub is design to to power speakers in certain range of OHM.  Ohm is measure of electrical resistance.  If the ohm is too low, it is like shorting the speaker wires and that will blow the amp.  If the ohm is too high, the speakers will not be able to deliver the sound (power).

Good Luck...

Answer 3

this will tell you everything

Ohm

The unit of measurement for impedance or resistance. It tells you how much a device will resist the flow of current. If you take two signals of exactly the same strength and send one to a 4-ohm speaker and the other to an 8-ohm speaker, twice as much current will flow through the 4-ohm speaker. In other words, the 8-ohm speaker will require twice as much power (wattage) to play at the same volume.

Impedance

The total opposition to the flow of alternating current in an electrical circuit at a given frequency. Impedance is measured in Ohms. Although car audio manufacturers label the impedance of most car speakers and subs at 4-ohms, the impedance of a speaker is actually not a constant. It's actual impedance changes with frequency and can vary greatly. Therefore, though 4-ohms is the standard impedance in car audio, this standard is more of an average impedance for speakers and amplifiers when driven within the part of the audio spectrum for which they are designed.

Resistance

The opposition to the flow of electrical current. Resistance is measured in Ohms.

RMS Power at 2 ohms

This spec tells you how much more power your amp delivers when presented with a 2-ohm stereo load. You can achieve a 2-ohm load by using parallel wiring or by using 2-ohm speakers.

Theoretically, amp output should exactly double as the impedance drops from the usual 4 ohms to 2 ohms. However, amp makers use different degrees of regulation on power supplies, which can restrict the actual increase in output.

Less regulated power supplies come closer to doubling their output into 2-ohm loads. An amp with little regulation can achieve higher wattage into lower impedances. An amp with stiffer regulation maintains rated output from your amp as other electrical accessories demand voltage from the battery.