Answers: Neither is better than the other. The difference is the different wiring methods used to gain the correct impedance load to the amp for the proper output RMS wattage.
The number of channel on an amp doesn't limit it to the number of speakers you enjoy connected, but impedance (ohms) and the frequency being sent to specific speakers does.
You can put as tons speakers on a channel as long as the impedance doesn't drop fall below what the amp can fiddle with. Since subs cannot tolerate high freqencies, they too are usually driven by a seperate amp as ably as the difference in power. Most systems will enjoy higher powered amps for the subs than the other speakers.
An example, four subs and respectively sub is 100 watts RMS @ 4 ohm and the amp is 400 watts @ 4 ohm, you will have no problems near wiring adjectives four subs to the amp like so http://i81.photobucket.com/albums/j230/s... as this results surrounded by a 4 ohm load.
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The ohm's(impedance if you are speaking of ac current as in speakers) should clash the output of your amp or radio. If you have an amp beside 2 ohm output, you could use 2 four ohm speakers tied with the +'s and -" from respectively speaker tied together (parallel). If you have a 4 ohm out put and two 2 ohm speakers you could cable them - from the amp to a negative on one speaker, after take the + on that speaker and chain it to the - on the other speaker, then from the + from the second speaker to the + on the amp. I hold a Fender guitar with 4 eight ohm speakers wired within parallel to make them contest the 2 ohm output of my amp. Sounds crazy, but I've been surrounded by electronic's since 1958.
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