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Your driver dictates the impedance not the amplifier.
If you have an 8 ohm amp, it just means it makes x watts at 8 ohms. If its stable at 4 ohms, it will make almost twice that. And if its stable at 2 ohms, it will make almost twice what it made at 4.
Most car audio amplifers base out at 4 ohms. Most home audio ones base out at 8.
The impedance of your subwoofers only varies to allow you wiring configuration options. So you can get the right load you want to get your amp at the correct impedance so it performs where it should.
If you have 2 4 ohm subs, and you wire then im PARALLEL, youll be at about 2 ohms load. If you wire them in SERIES, youll be at 8 ohms.
If you had 2 2 ohm subs, and you wired them in parallel, youd be at 1.33 ohms or roughly there, and if you wired them in series youd be at 4 ohms.
Ideally if youre running 2 subs, in parallel, you want 2 4 ohm single voice coil subwoofers, and you want an amplifier thats bridgable down to a 2 ohm mono load.
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