The house I live in has integrated speakers and they are all hooked up to an old AV receiver (Marantz NR1604). Currently it is annoying to play music through the receiver because essentially I have to plug my phone directly to the receiver. I am looking at other options.
Currently I set up a RaspPi to run Volumio, then I connected the RaspPi directly to the receiver. This allows me to play music from a music library (eg. a NAS) but I still can't easily stream music from my phone to the receiver. I'm wondering if anyone has any set up ideas for easy streaming from phone or computer to the AV receiver.
A decent solution is to install shairport-sync on the Pi and advertise the service over multicast dns (Apple bonjour protocol). This effectively creates an AirPlay device on the network that’s usable from any iDevice. This had a very high “wife approval factor” when I did something similar at home.
There are bluetooth to AV "adapters", basically a small device that can be controlled from your phone like a bluetooth speaker and can be connected to your audio system.
I've had some success using moOode audio on a Raspberry Pi (included in the Pi Installer I think, but here's their website in case I'm misremembering). I use it with Roon, which is linked to my streaming service and allows me to stream tracks; but I see it works with Spotify Connect too, so if that's your service of choice then perhaps this will work for you!