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New member Username: John_tBurnley, Lancs United Kingdom Post Number: 1 Registered: Feb-06 | can anyone help im trying to find out some info on ohms and loads with regaurds to speaker's can it be explained with some examples any help would be fab |
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Gold Member Username: Jan_b_vigneDallas, TX Post Number: 7588 Registered: May-04 | What do you want to know? |
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Silver Member Username: TwebbzAnn Arbor, Michigan USA Post Number: 355 Registered: Apr-04 | "Ohms" is the resistance load seen by the amplifier. Most speakers are rated at 8 ohms but there are a few that are 4 ohms & 6 ohms. What you have to think about is if the speakers that you select are compatible with the receiver or amplifier that you want. Some budget receivers only accept 8 Ohm speakers and will overheat and can be damaged with 6 or 4 Ohm speakers. Higher quality amplification is generally more flexible. Your stereo sales person will help you. If nothing else, just look on the back of the amp unit adjacent to the speaker hookups. It should indicate what "Ohm" speakers are appropriate. Also, speakers are marked near their terminals too. |
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New member Username: John_tBurnley, Lancs United Kingdom Post Number: 2 Registered: Feb-06 | many thanks this has been some help i dont supose you know about 100w line amplification and also what it means when you test an 8ohm speaker but only get a 2 ohms reading on a calibrated tester and does the wattage of a speaker also have anything to do with the load on the amp |
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Silver Member Username: Timn8terSeattle, WA USA Post Number: 772 Registered: Dec-03 | The term resistance is usually used to describe DC fixed loads. Since speakers are neither the correct term is "impedance". Speaker impedance changes with frequency. It's not unusual (unfortunately) for a speaker rated at 8 ohms nominal impedance to have dips below 4 ohms and peaks of 40 ohms making the rating little more than a rough guideline. This might help. http://www.hometoys.com/htinews/feb04/articles/polk/impedence.htm Tube amps can be especially sensitive to large impedance swings which is why you may see the term "tube friendly" applied to a particular design. If you attach a typical ohmmeter to a speaker the reading you'll get will be a combination of the resistance of the drivers voice coil(s) and the resistance of the crossover network, if one exists. This is not the same as the impedance of the speaker system while it is being driven by an amplifier. Speaker impedance is generally measured by running a sweep tone and having a computer program display the impedance on a frequency graph. |
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sty29527q 365 Unregistered guest | Have a look at this it might help. www.aqdi.com/speakerz.htm |