![]() ![]() This is essentially a short circuit and will most likely cause damage to the components in the receiver. Now if there is a sustained musical note that is at the frequency where the impedance drops to 2 ohms, a pair of speakers will provide a 1 ohm load to the receiver. So an 8 ohm speaker provides a 4 ohm load to the receiver. Impedance and Resistance of equal values end up being half of the rated value. The problem is compounded when you have two of the exact same speaker connected in parallel. With one speaker this isn't usually a problem as the music is constantly changing. A typical 8 ohm speaker could have an impedance that varies from 2 ohms to 10 ohms. There are almost always peaks at certain frequencies and dips at others. The impedance of a speaker varies depending on the frequency that it is being played at. So older amplifiers weren't designed to supply the extra current that a 4 ohm load needed. As Solid State took over, the speakers moved to 8 and 4 ohms. Older speakers were generally designed for tube amps and 8 and 16 ohms were the norm. So an amp driving an 8 ohm impedance will need double the current to drive an impedance of 4 ohms. So if you are driving your speakers with a given Voltage V, but you change the Speaker impedance R, then the Current must also change. If one of the variables change, then it must change the other variables. This is usually specified as Volts = Current x Resistance. ![]() ![]() This is why they are both specified in ohms. Impedance is the AC equivalent of DC resistance. The second is the fact that speakers that are rated at a particular impedance (8 ohms in your case) are actually a "nominal" impedance. The first is the ability of the receiver to supply an extra amount of current. ![]()
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