Yes, the lack of coloration from the box is one of the big pluses of planars...part of why the articulation and transparency is so good. However, that said, there is some coloration from the panels themselves...some people report metallic sound with metal ribbons and a quacky, plasticky sound with electrostatic panels. IMO, the plasticky panel sound is pretty easy coloration to ignore because it is kind of ever present and so your brain just filters it out. The one speaker I had with a rather strong coloration this ways was the Infinity IRS Beta. If you came straight from a live concert they you would hear this coloration quite strongly. However, after listening for a little while you soon forgot about it and enjoyed the overall transparency, dynamics and scale the speaker brought. Come away and then back again and you had to reacclimate sometimes. With Apogees, this was pretty minor in comparison and same for the Acoustats, which had low coloration...still a bit but we are now talking about a low level here.