As you might have guessed there are two main ways to connct speakers together, either
parallel or serial (or a mixture of both).
In a parallel connecton (i.e. speaker out
on one speaker connected to speaker in on the other) the total resistance gets lower as
the amount of speakers (load) is greater this is due to that fact that although the
speakers are still 4 ohms (say) and thus there is still resistance in the circuit, as
there are (in a 2 speaker parallel setup) 2 paths the current can travel thus halving the
resistance (if both speakers are the same ohmage) (
For a series connection (where the hot signal form the amp
is connected to one spaeker and the cold to the other (1st in the chain and last in the
chain generally) and then the cold on the 1st speaker is connected to the hot on the next
(and so on until you get to the last speaker in teh chain)) This has the effect of
increasing the resistance as each speaker is adding extra resistance into the circuit (the
resistances are added together to get the total amount) as the signal has only one path to
travel (this creates a voltage drop on each speaker thus a higher total voltage loss
whereas in a parallel setup the spakers see no voltage loss.
connecting bulbs in series or parallel at school, parallel connected bulbs get no dimmer
as more is added (while current to power the bulbs is available) whereas to maintain
brightness on a series setup the voltage has to be increased) .
example 2 4ohm speakers connected in parallel make 2 ohm and connected in series would
make 4 ohm.