grey area...
The reason that people like to combine one type of receiver with a certain kind of speaker is based on the idea that each “colors,” the music in a certain way. For example some might claim that a certain brand of receiver is “bright” and thus would pair them with a set of speakers that they feel are “warm,” in an effort to cancel each other out so that the resulting sound is “neutral.” The problem with this is that all of these descriptions are purely subjective and based on personal preference. One person may claim that a particular speaker is bright while someone else may claim that they are warm…so you really need to take these recommendations with a grain of salt. It is true however; that speakers do color music…no speaker is perfect…if there was one perfect speaker we wouldn’t have the vast sea of speaker manufactures to choose from. However the jury is still out on receivers having an effect on the sound. What I mean is there are those who believe that if Brand A and Brand B are well designed receivers and you do not exceed the power specifications of the amplifier the signal reaching the speaker should be identical, in other words not colored. I’m personally in this camp, and there are others in these forums that can provide you with a much more technical explanation.
Now that we have that out of the way, I’ll let you know that I’m quite pleased with the combination of my Onkyo receiver and 600 series B&Ws. I won’t describe the sound with fluff, but I will tell you that the sound coming out of my system has given me goose bumps…but to each his own. Also, when I auditioned the B&W’s they were on rotel amps and they sound the same on my onkyo…IMO, but perhaps that will help in your auditions.
***this post is merely my thoughts and opinions, not responsible for the use of information or accuracy contained within***