Question:
I purchased two 15 inch Q-power (infinity) subwoofers they run at 8 ohms and are 400 watts rms and 800 watt peak each all the amp I look at only give me the 4 ohm rating what would the what would the 4 ohm rms need to be to power a 400 watt rms at 8 ohm?? i hope my question makes sence...
Answers:
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Subs in parallel, where Z is the total impedance (ohms) and sub# is each sub (or coil in a multicoiled sub):
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Z = 1 / (1/sub1 + 1/sub2 + 1/sub3 + ...) as many as you have.
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if your amp is 8 ohm out put , and your speakers are only four, your anp will not have to work so hard to drive them.An 8 ohm- L- pad between amp and each speaker may be a solution
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If you bridge your amp to mono and run two 8-ohm speakers into it, it will read the load as 4-ohm. Happy thumping!Blaupunkt CD30 - How do I add an external mp3 player input (mStation)?
If you intend to use a 4 Ohm Output Terminal on your Amplifier, you can connect both 8 Ohm speakers together (+ Terminal to + Terminal, and - Terminal to - Terminal) and produce a 4 Ohm load for the Amplifier. That arrangement can safely handle a maximum of 400 + 400 = 800 Watts RMS or 1600 Watts Peak.As long as your amplifier is less than that you will not destroy the speakers. Using power like that will probably drive you deaf in short order if you are close by the sound system.
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