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Resistor to change the ohm load?


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I was thinking abou this the other day and was wondering if you have let's say a 4 ohm SVC sub like a 9500 or something, could you take a 4 ohm resistor, wire it in parallel, and make the ohm load 2? Or is it not possible since resistors aren't polarized?

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I was thinking abou this the other day and was wondering if you have let's say a 4 ohm SVC sub like a 9500 or something, could you take a 4 ohm resistor, wire it in parallel, and make the ohm load 2? Or is it not possible since resistors aren't polarized?

Being that speakers run on AC power, the resistor would have to be non-polarized. It would be quite difficult, and probably rather expensive, to find a resistor with that low of an impedance and able to handle that much power. You'd be better off to create a coil out of some solid 32 gauge wire to get to the resistance you want, but then you would have to keep it cool. You'd also be losing power there anyway getting the sub itself only half of the power from the 2 ohm load, thus making it useless anyway.

Best solution, sell the sub, buy one with the coils you need.

Donts they use resistors as bass blocker?

They use non-polarized capacitors for those. Different farad rating yield different crossover points, however the final ohm load of the driver can change all parameters too.

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So basically if you took a standard 4 ohm resistor and hooked it up it would fry because of the amount of current?

A.) The resistor is probably not rated to handle that much current

B.) The "resistance" from a speaker isn't resistance that people thing of in a direct current sense. It's an impedance, or reactive load. Resistance changes throughout the coil's travel through the magnetic field. Adding a static 4-ohm resistance onto the incoming signal is going to mess with that.

Edited by Maxim

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Adding a resistor inline with the sub is going to mess with the signal going through, effectively changing the frequency response curve quite a bit.

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A lot of bad info here.

Caps are polarized, not resistors.

As long as you use a non-inductive resistor, it will not affect the signal or frequency response.

If you created a coil from wire, you have created an inductor, which will change the frequency response.

The correct answer to the OP question should be:

Even if you parallel enough resistors to do this, it is a waste. Let's say you have an amp that does 500 watts at 4 ohms and 1000 watts at two ohms. The 4 ohm sub gets 500 watts. Add the resistor in parallel (and assume it is VERY high power), and your amp now outputs 1000 watts. But guess what - 500 watts goes to the sub and 500 watts goes to the resistor. Nothing gained but some additional heat and stress on your electrical.

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