UnUnOctium
Expert Member
I reckon if you can make the remote receivers run on say a 9v battery lasting 6 months it would be perfect. Is blue tooth an option or an open wifi band like 802.11 @ 2.4/3.6/5GHZ? There would need to be security of some kind so you don't land up with interference from the neighbour if they had the same system.
Well, 433.92, 2400 and 5800 MHz are all open for unlicensed use (by SRDs) by ICASA in SA. For high(er) quality sound, depending on your modulation scheme, you'll probably need ~ 40 kHz per speaker, so total bandwidth of 240 kHz for a 5.1 system (excluding guard bands). Putting a 10 kHz guard band of either side (quite lax) gives you 360 kHz total bandwidth. Fits easily in 433.92 MHz (1.74 MHz total bandwidth).
Interference would be a small issue since I'd set it up for very low power output such that the effective range would be 10-15 m max.
The biggest challenge would definitely be getting sustained, long battery life.