Pairing with Yamaha difficult - Sound quality is poor.

Have the Bluetooth adapter angeschaft with the hope that this work with my Micro-systems from Yamaha.
The pairing is very strange. First, in any case nothing funtionierte at the Yamaha plant (MCR-332 and CRX 330). In other docks I could easily connect me immediately, not so with the Yamaha equipment. I wanted to return the adapter, as I tried one last time.

It is probably so that you on the phone (iPhone6) hires the Blueetooth reception and at the same time must attach the adapter. Otherwise, a connection is not possible. One has to be patient and try as multiple, then it works.

Once connected, then can the iPhone with the remote control of the Yamaha-conditioning control (pause, back, forward, etc.) is the transmission power / distance to the adapter or something to 4-5 meters, if something is in between, wall so, aborts the connection. Otherwise, the adapter works well, after all, a way to compensate for the lack of auxiliary port of the Yamaha plant.
The sound quality is in the upper range of volume, however, very bad, the louder the more noise! I have already complained, and the second adapter is just as bad. I would buy the adapter again!