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Originally Posted by fel0ncod3
ok, referring to the pic above, I would need a one channel amp, putting out 500 RMS (assuming both subs are 250rms each) ok, now, what would be the difference if i have a 4 ohm load on each sub (final load going to the sub) (like the pic above), only with a 2 channel amp,putting out 250rms on each channel?
what is the difference, and which do you recommend that i do?
should i have a the subs wired separately into a 2 chan amp (250rms X 2), or wire them together going into a 1 chan amp (500rms X 1)
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Ok, not to get technical on you, the sub IS the load, so you can't say "a 4 ohm load on each sub"... the load is put on the amplifier by the speakers.
Now, as far as the 250x2 vs. 500x1 - they both would deliver the same power, but the question for a subwoofer is how much current they drive. Current is what causes the speaker cone to move, so whichever version drives more current is what you want to do. That being said, most of the time, these two will be equivalent in output. However, it's generally recommended to drive a single sub channel so that you are certain that you get the same singal to both speakers (if the original recording has slightly phase-shifted the two channels (not that this is common) then the speakers will not be working 100% with each other. A single-source for the signal ensure this can never happen.)
In your example above, the configuration shown is the best choice, as it gives a total load of 4ohms (lower ohms = more current, as long as the amp can handle it, and it's a current-driven amplifier). If the speakers were both DVC 2-ohms, then your final load would be 2ohms in that setup, which is even better (most quality amps can handle this). In general, it's best to pick an amp that you want to use, check it's load limits, and then setup the speakers to use the amp at those limits.