Powering an 8-ohm 210 and an 8-ohm 410 with 1 amp... Are the individual speakers in the 210 getting more watts than the individual speakers in the 410? IOW, if your amp is rated for 600 watts at 4 ohms, do the 210 and the 410 get 300 watts each or does the 210 get 200 watts and the 410 get 400 watts?
Same ohms, same power. With a 410+210 rig you want the 210 to have twice the impedence of the 410 to get consistent power applied to all the speakers. With an 8 ohm 210 and a 4 ohm 410 it is 2.6 ohms combined (which is a no-no for some amps). A 16 ohm 210 and an 8 ohm 410 is 5.3 ohms combined, and safe for any solid state amp that can go down to 4 ohms.
It is true that either cab will get half the wattage if they have same resistances. As for post by pickles, I'd appreciate if anyone could back it up or give a different point of view. What if I have a 400W 8Ohm 4x10" and a 400W 8Ohm 2x10" for example - will they be heard almost equally (putting aside the fact, that they may have different voicings - one giving more low end etc)?