Hi Pescheli, the question is quite specific with the model names. The product SV1820 is only a Blutooth receiver with optical output and aux output. Adapter to Cinch is included. If your equipment has an optical in, aux in or cinch in connection, then it will definitely work. I connected the SV1820 to my 1970 Braun Audio 300 by buying an additional adapter. Aux -> Cinch -> 2Pol. To sum up: If you can already play music to your Maranz today in any way via cable, then with the right cable it will also work with the SV1820 (as well as any other similar Blutolthem receiver based on Aux). Greetings T

Hello Yes, you can connect several devices. However, you cannot control them at the same time.

Hello Daniel I have to disappoint you. As great as the One for All is at receiving data from BT devices, it cannot transmit. So unfortunately it's a one-way connection, it can only play back what comes from the Bluetooth source. I also looked for a solution the other way round, but I wasn't happy with it (Oehlbach BTT5000 Bluetooth Transmitter).

The One for All is just a receiver, which is what you use with Spotify. If you want to use your Bluetooth headphones with your hi-fi system, you also need a Bluetooth transmitter.