Ok. I have just gone to order a pair of the er-4 phones only to be greated with the option of the 's' model and the 'p' model. The 's' is apparently for audiophile musicians and the 'p' is for use with portable devices as it is +10db. Which one should I buy to use with my ipod both direct and...

I could really use some help with my first headphone system. This project has come about as we have a 11 month old baby boy that is currently stopping my music time! I bought an iPod last week thinking that this would be an easy solution however I am not really impressed with the sound. I...