Audio Systems/Audio equipment

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Expert: - 11/13/2011


Question
What is the difference between a 4 ohms and 8 ohm speaker?

Answer
Do you know Ohms Law?

Ohms law states the voltage across an impedance is proportional to the impedance in ohms and the current passing through it in amperes.  Mathematically it is expressed as E = Ams X Impedance.

An 8 ohm speaker coil has twice the resistance as that of 4 ohms.

Implicit in the impedance rating of the speaker is the requirement of the driving amplifier to have a matching characteristic to deliver the maximum amount of power to the speaker by optimizing for the give impedance rating of the speaker.

Please let me know if you have further questions.  

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Cleggsan

Expertise

Audio Design Engineer; systems, loudspeakers, cd/dvd players, etc. I am knowledgeable in all high end audio equipment and installations. MAKE SURE YOU GIVE A MAKE AND MODEL NUMBER AND CAR IF IT IS AN AUTO QUESTION. Note: I am getting some who ask good questions that take a lot of time to research but then the questioner fails to read the answer. Please don't ask questions unless you are seriously looking for an answer. If you find an answer to your question otherwise then let me know with your reply. Thank you.

Experience

Have been associated with audio design, standards, testing and component systems for over 40 years.

Organizations
Life Fellow Member of Audio Engineering Society Life Senior Member of Institute of Electronic and Electrical Engineers

Publications
Review technical manuscripts for IEEE Spectrum Write occasionally for high-end audio publications

Education/Credentials
BSEE/MSCS/MBA

Past/Present Clients
Past Employee/advisor to several well known audio products manufacturers

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