i for one know that every bit of kit i have ever owned (and there has been a lot) has allways sounded better when warmed up. valve stuff NEEDS warming up period but speakers being mechanical also work better after they have been playing for a while how do i know this? well it's not 20 odd years working with electricity or the knowledge of my farther (who was a leader in his field of electricity for nearly 45 years) it's my ears friends my ears. BTW my Tri Vista Needs warming up