Bluetooth speaker recommendation

Hi,

Can anyone recommend a decent Bluetooth (or wireless) speaker that is capable of filling a 4.5m x 5.5m room with sound. I'm setting up my rumpus room as a home gym so it has to be loud enough to be heard over my bike turbo trainer. I'm hoping not to spend more than $200, but could be convinced otherwise.

We are an apple household if that makes a difference to anyone's answer.

Thanks