I was wondering if Apple improves the sound quality with each iteration of its devices.   In other words, is the 4 or 4S any better than the 3? We'll have to wait and see, but I wonder if the 5 will be any better than the 4s.   Additionally, I have a bunch of older iPhones in the house...

To start, just want to say what a great resource this site is how knowledgeable you all are.   I want to ask about quality headphones and portable headphone amps. I currently use Monster Mile Davis Trumpets for in-ear listening. I'd like a tad more bass for non-jazz listening but not at the...