Trond Bluetooth Receiver and Transmitter combo

Trying to sync different brands of Bluetooth speaker, I thought I'd try a solution of using third party transmitters / receivers to link devices together. But as I found and is shown in this video, even having two of the same brand of transmitter there are sync issues and the music being played out of the speakers is not synchronised and therefore unusable. This is particularly noticeable with music that has a heavy continuous beat, the speakers sound as if they are an echo of each other and are not in sync.