Alpine radio in the Mercedes CLK

Hi guys, I’m desperately looking for help on the Internet and here’s my last chance. I’ve been driving a Mercedes CLK with the Mercedes Audio 10 CD original radio recently. Now I want to connect my Alpine radio, and that’s how we get to my problem: the car has a Bose system. I pulled out the radio once and looked at the connections. The radio only has the 2 ISO plugs in the back. Logically, I would just have to go from Alpine to ISO and then it would have to be Does the Bose amplifier generate the signal via the speaker channels and is then simply turned on? What’s more, I own the Alpine 9812 RB with a maximum output power of 4 x 60 W. At MediaMarkt, the seller wanted to turn on an adapter worth more than 120 € and told me something about resistance and bla bla bla. Does this lead play a role? In the hope that I will be helped here, I would like to thank you!