I have just boght a Denon DNP-730AE network audioplayer with Spotify Connect. The network player is connected to a Denon PMA 1500AE amplifer and this to the loudspeakers. I can stream perfectly to the network audioplayer with my Spotify app on my iPhone, but if I try to change volume on the app (or by using the iPhone volume buttons) nothing happens on the DNP-730AE, although on the spotify app itself, the volume bar becomes bigger or smaller. But it looks like the DNP-730AE doesn't react. So I have to walk to the amplifier every time to adapt the volume.
Does anyone have an idea, why it doesn't work?