: Amps, Speakers, and power supplies If you have a 4 ohm speaker and you add a 4 ohm resister to the positive wire. Do you have an 8 ohm speaker? Is impedence the same as resistence? I have 2 Scosche HD4004 HD Speakers 4 oms

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Welcome Gary. It sounds like you might like to turn your musical situation into a laboratory situation, as with a list of questions like this you'll either need to have a designer/ engineer redesign your power supply and amplifier or be willing to risk having your whole set-up go up in flames to get the answers you are looking for. As for your question about whether or not your amp in its current configuration will match up with your current speaker set-up, from the information you given us here, I'd say it'll match up okay. And as for the resistor wired in series with the speaker, well it would need to be a 15 watt resistor and it would just convert your output to heat, so I would be more inclined to find another speaker to wire in the circuit in place of that resistor, where the amp output would be converted into sound. Two concepts in electrical circuit operation are resistance, which is not frequency altered, it stays the same rating, which is pretty easy to understand. The other concept is called reactance, where the resistance can be altered depending of the operating frequency of the circuit. This is how a speaker acts in operation, where the resistance of the speaker changes in reaction to the frequency of the signal being presented to the speaker. This type of resistance is referred to as impedance. This is about as simple as I can think to explain it.