- David Klausner

Ohms are the units that impedance is measured with. You can kind of think of impedance as the measure of how hard the amp has to push to get current to flow. The lower the impedance, the more power will be output from your amp. Unfortunately, the amplifier circuit wants to push against something, so that if the impedance is too low, the amp can perform badly, and even overheat and burn out. Because of that, you want to pay pretty strict attention to how your amp is rated. Some PA power amps can work from a range of 16 ohms down to 2 ohms, but most guitar amps have a much more restricted range. When you run speakers in series - from one speaker to the next - you are adding their impedances together, so if you connect two 4 ohm cabinets that way, you will have an 8 ohm load. If the speakers are wired in parallel - splitting the signal with a "Y" connector, for example, the formula is 1/x + 1/y = 1/z, where x is the impedance of one speaker, y is the impedance of another, and z is the total impedance. Two 4 ohm cabinets wired this way present a total load of 2 ohms, which is a much louder way to wire them, but will probably do serious damage to a guitar amp.

October 24, 2002 @09:31pm

what does it do to your power?

how do you get your amp to put out the most volume while makeing it work the least.

i have heard of people re-wiring their cabinets to run at different ohms.

please explain