What's Impedance Matching?
Last Updated: 06/16/2015
Here are some examples of common numbers:
2 - 8 ohm speakers together in parallel = 4 ohms
3 - 8 ohm speakers together in parallel = 2.67 ohms
4 - 8 ohm speakers together in parallel = 2 ohms
For a parallel circuit, the total Impedance (r) is given by the inverse of the sum of the inverses:
Therefore, by 'impedance matching', the math is taken care of for you and gives your amplifier a steady 8 ohm load which is ideal for your amplifier (and simpler for those of us who see only hieroglyphics when we look at that formula).
Impedance matching can be easily achieved by adding a speaker selector or impedance matching volume controls to your new sound system.
Still confused. Should I set my HD 650 speakers to 8 ohms or 4 ohms.
Inwallstore: Set them at 8 ohms. The 4 ohms setting is for knowledgable technicians with particular circuity needs. This article refers to the process of "needing" impedance matching and what's going on for whole house audio.