Best speaker setup for multi room exposure?

[eternity]

Thanks Shannon! Then the 3+ channel wired system is better than the lossy compression BT system. Great to know.

So I guess in order of efficacy (assuming 20hz-20khz by default), this is what I have so far. I understand you use your cell phone speakers to play subliminals. Where would you rate the cell phone speakers (assuming current generation models of either samsung/iphone)

Headphones
Wired 2 channel stereo speaker
Wired 3+ channel speaker
Wireless / Bluetooth speakers