How to use ceiling speakers with iPhone?

So guys here's my problem, in a room in our house i've got 4 speakers in the ceiling and I have the jacks in the wall. What I know now is that I have to plug in my receiver to those wall plugs through the speaker cords and using banana plugs to adapt them. But my receiver doesn't have an aux adapter bc it's 10 years old so how can I get the receiver to play from my phone?

Even my receivers of 40 years ago had an "aux" or tape jack. Receivers don't cost a lot of money(relatively) so you might look around for a replacement that does have an aux jack.

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