IMO if your 2 channel system is properly setup, you don't need the added speakers. The added gear, expense and trouble doesn't warrant the benefit. The benefit is having two speakers behind your head.
For a 2 channel HT system the only additional gear you may need is a processor to decode the TV signal and convert it to analog. If you have cable box with analog outs you don't even need it, as you can take the signal from the box.
For a 2 channel HT system the only additional gear you may need is a processor to decode the TV signal and convert it to analog. If you have cable box with analog outs you don't even need it, as you can take the signal from the box.