I have just returned the SC-ZT1 I bought recently because the wireless performance and design is extremely poor. This is proved by the user manual which states that the amplifier/transmitter unit must not have anything directly above or below it, any Wifi device within 3 metres, must be at least 50cm above the floor, and must be in direct line of sight of the speakers. These restrictions are totally impractical and make it impossible to get a good wireless connection in a realistic living room. I spent two weeks moving equipment and furniture and the speakers ended up in a position where I might as well have used traditional wired speakers. You cannot find out about this major design fault until you try to use it because no one else has written a review. You would expect something at that high price to be brilliant, but it is far from it. What a waste of time - do not buy this product.