Yes!! You will definitely hear the difference through in both clarity and depth. You did not mention the type of processor or receiver that you are using but assuming it has only one output per channel you will need to use good quality "Y" connectors to allow 2 cables per channel into the M25.
After installing the new cables run the channel volume setup again to take account of the signal splitting and bi-amping.
After installing the new cables run the channel volume setup again to take account of the signal splitting and bi-amping.