Ptm you need a signal to get the job done and in my case i did not get better than V 2 sound till the 130 hr mark. There very listenable with a large and deep stage right out of the box. Bass is good but mids and highs need burn in edgy and flat IMO. I used STS burn in cd running while at work and did listening time in the evening hours for a ears on listening for changes. Now after more than 200 hrs boy oh boy for me a highly recommended upgrade.
Mike