Bowers and Wilkins speakers on e82, HELP NEEDED

[Zesuro]

Hello everyone, I need some help ans thought this would be a good place to ask. So I’ve been wanting to upgrade my speakers and didn’t seem to confident in the bavsound speakers. I then got the idea of installing the bowers and wilkins speakers from some of the newer models into my car. I started with the rear tweeters and midrange and they worked perfectly. Easy to connect. I then decided to order the tweeter and midrange for the front side. NOTE: The front tweeters are actually the rear door tweeters from the newer models. Since the diamond ones not only would cost more, but they would be a more difficult to fit. Once I got everything connected, it seems only the tweeter is actually playing any sound. For some reason nothing comes out of the mid range speakers. I tested the two that I had to make sure ine wasn’t faulty, but the issue still continued. I have the b&w tweeters connected and kept the stock mid range for now, but I really want to have b&w for all of the speakers in my car. Any ideas as to why that is? I will admit that I don’t know much about sound systems, but from what I know both of them are the same ohm rating. Could it be that I need a stronger amp? I have a 2013 BMW 135is coupe with the Hifi system. Any help would be great appreciated