The difference between 2 ohms and 4 ohms is 2 ohms.
2 in series with 3&4 in parallel
It is the impedence (coil resistence)normally sub component (drivers)are in 8 ohms impedence.2 in parralel is 4 ohms and 4 in parralel makes it 2 ohms.
That would yeild a 4 ohm load
Parallel
Four 8 ohm speakers wired in parallel would give an effective 2 ohm load.
R = 1/[1/2 + 1/4 + 1/6 + 1/10] Add up the reciprocals of the resistances, and take the reciprocal of the answer.
Yes, just make sure your amp can run at 2 ohms and you're fine.
the impedance of a speaker is a characteristic that is has. A 4 ohm speaker will always have a 4 ohm impedance and it cannot be changed. If 2 speakers of 4 ohm impedance are wired in parallel, then the total impedance will be 2 ohms. Similarly, if you wire 4 speakers together, the total impedance will be 1 ohm. Wiring a 2 ohm speaker to an amplifier rated to drive a 1 ohm load should work without any problems but expect the total power output to be somewhat lower than with a 1 ohm load.
You could go with a 600 watt 2 ch amp or a 300 watt mono block amp, depends on what OHM the subs are, if they are 8 ohm you could wire them down to 4 ohm or if they 4 ohm u could wire them to 2 ohm, i have a 600.1 Boss amp and subs are wired together at 2 ohm and they BANG.
nope
If you replace a 2 ohm speaker with a 4 ohm speaker you will only get one half the original power. This is usually not a problem because you rarely, if ever, run a stereo system at full power. Half power is only -3db, which is generally only one click on the volume control. It might also sound slightly different because the cross-over frequency might be different,
You can, but the available power will only be about half of rated, and the frequency response will be slightly different. Better would be to connect two 8 ohm speakers in parallel, making an equivalent 4 ohm speaker.