First noticed that all connections were loose. The adapter wobbled to the RCA jacks on the KH-amplifier, the quality, not quite as flexible RCA audio cable slipped almost by itself again from the adapter.
The biggest drawback for me and the reason not to use this adapter, is the significantly poorer transmission quality.
Without adapter, so the RCA cable from the audio device connected directly to the KH-amplifier, it was a much better, louder and more precise sound.
To my mind, these adapters are good nothing!