OK, then I misunderstood. Seems like you are talking about two different things.
You can add speakers in multiples without impedance issues - ie, an 8 ohm impedance can be matched by:
2 16 ohm spkrs in parallel
4 8 ohm spkrs hooked up series-parallel
etc, etc.
Perhaps get a friend with a bit more electronics experience to assist?
Alternatively, find out if your TV has audio out and add a small amplifier and seperate speakers?