These were the two closed phones I considered. I read the reviews and selected the Sennheiser which is now called the HD1. But I still wonder if the 550 would have been better and more open sounding. The HD1 has a very smooth treble and powerful bass but seems a little too dark. The 550 appeared to be too bright and not very smooth in the treble. So has anyone listened to both of these? Would love to hear your impressions.
My musical tastes are Classical and Jazz and I favor a smooth treble. Very sensitive to overly bright phones. I love the HD 650.