Most separate amplifiers without a built in preamp or tuner can handle 4 ohm speakers as can most high end av receivers. Before you buy a 4 ohm speaker make sure the amplifier or receiver can handle it.
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Since we are converting an 8 ohm speaker to 4 ohms lets pretend the r in the equation goes down.
8 ohm speakers.
Any speaker impedance rating that is 4 ohms is typically going to be a high end audiophile product that wants an amplifier that can really put out some power.
Impedance comes from the interaction of the speakers voice coil and other electronic components.
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The only way resistance goes down is by power getting smaller or current getting bigger.
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A speakers impedance rating is an average taken over a wide range of audible frequencies.
This isnt a snobby thing.
It may not be clear but if the amplifier or receiver manufacturer publishes power ratings in both 8 and 4 ohms youre safe.
Most bookshelf and tower speakers are rated either 6 ohms or 8 ohms.
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A 4 ohm speaker requires more power from an amplifier than an 8 ohm speaker to produce the same loudness of sound.
In this case bringing resistance down to 4 ohms will net us bigger current or lower power.
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