If I listen to any of my receivers, old and new, out of the box is too bright. I did, a long long time ago, have a HK330B that never sounded right at all, very dull, like a hi cut filter was on. A trip to HK, and almost 6 months, solved all it's issues except it had nowhere near enough power, so I sold it off. My new Yamaha receiver is too bright out of the box. The Natural setting is pretty hot. YPAO hasn't made me happy so far, but it doesn't sound awful. It just seems to sound better if I manually tweak it.