@stuartk
Out of the box, I had my Electrocompaniet integrated(latest model) connected to the E50, and my mouth dropped. The speaker sounded just like how it is described on the Buchardt website. After a period of time, I connected the Hegel 390. The speaker went to a whole new level. I think it was because of the higher wattage and current of the Hegel. The sound was so good,it was if the Hegel was used to voice this speaker. The bass is unreal for a bookshelf speaker. The Hegel's grip on the woofer was uncanny. The Bass started and stopped on a dime. Treble had the sound of cystal clear water and not a hint of brightness. Vocals were, you are there good. The best part is you can listen and very low volume levels and the sound is the same.