Thanks for the reply ChrisA.
That all sounds good but more than I really require or was looking to spend.
I managed to solve the problem using a program called Boom, that I purchased from the app store for £2.99
Its main function is to boost volume to speakers for the likes of DivX movies etc., However its also includes a option to download an EQ that works system wide and overwrites any other than apps contain such as the EQ in iTunes.