ADVENT heritage 8 inch speaker blown: where or how

I have a set of ADVENT heritage tower speakers...........The 8 inch speaker is blown (low frequencies I can here rumbling/distortion):

I saw a few foam repair kits for the rim.............I inspected the foam and there are no tears....How do I tell if its the coil, foam rim or cone? Any advice?

where can I get a replacement speaker?



Thank you

I noticed that once the foam is removed I can take out the cone.....................the orange coil is seperated from the cone tube