Subs and ohms.... how is it calculated and how does it work?

Question:
so i know quite a bit of stereo instalation but i have never gotten to deep into it. my question is how does bridging an amp affect performance and how do you calculate the ohms you are running when you have multiple sub woofers? whats the best place to answer these questions? how are ohms affected by running multiple subs? and i dont want to hear about looking it up on crutchfield.

Answers:

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Ohm's is a measurement of resistance. Think of kinking a garden hose, the more you kink, the more resistance.

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In electronics, the less resistance across a power source, the more it's a dead short. So it's much better to run an amp at a higher resistance than a lower one, contrary to popular belief.

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You do get more power from lower ohms, but at a price...

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This will:

When you have your amp bridged will it give you more watts if you cross the negative and positives wires?


1) cause the amp to run hotter
2) increase the THD (total harmonic distortion)
3) reduce the life of the amp because of excessive heat

Will this amp work if i am only going to play it at 100 watts rms x4 channels?


As watts are always added when subs are wired together, the amp needs to be twice the watts RMS.

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The resulting ohms depends on the wiring method used.

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For series http://i81.photobucket.com/albums/j230/s... the ohms are just added together.

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For parallel http://i81.photobucket.com/albums/j230/s... there is a formula and it's this.

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Where Z = the total impedance (ohms) and sub# is each sub (or each coil in a multi-coiled sub):

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Z = 1 / (1/sub1 + 1/sub2 + 1/sub3 + .) for as many you have

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The quick and dirty is IF both subs are equal in ohms AND wired in parallel, the ohms will be cut in half.

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You can mix these two methods of calculations for different configurations.

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You can wire as many subs to a channel of an amp as you want AS LONG AS you don't fall below the recommended impedance load of the amp per channel.

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the lower the ohms is on a speaker the deeper the bass will be on that speaker

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Ohms is the resistance of the speaker's voice coils. Learn ohm's law to find multiple speakers. Two 4 ohm speakers in parallel equals 2 ohms. Two 4 ohm speakers in series equals 8 ohms. Bridging two amps delivers the power of both amps. Ie; two 100 watt amps bridged will theoretically supply 200 watts.

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For pete's sake, resistance will NOT determine how deep the bass is.

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ohm is the resistence to current. 8 ohm will draw alf the current from the amp. compared with 4 ohm, but 8 ohm will sound half the lod of a 4 ohm. you can find (but rare)2 ohm speakers. now by puting two 4 ohms in serial, you drow 8 ohm's, in paralel, 2 ohm's. How will afect your amp deppends in his specifications.
you can try car stereo review, or search for "car stereo magazines"

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the lower the ohms the more distortion and the amp will most likely get stressed and fri-go with 4 ohm
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