In response to Stretch:  Thanks for your interest in the new 5T. We have put a lot of love into this fine speaker and are very proud of the result. Despite the difference in the photos, the ports actually have the same internal diameter (50mm). However, the 533-T port has more "flair" than the new 5T - so it looks a little ...

Well....I pulled the trigger...dropped the hammer...whatever I tried out the 533-PTs for a month but while they are very nice speakers I just couldn't get the HT rumble I wanted and there appears to be a slight dropoff at about 100hz that I noticed on some of the music I like.  Overall, I'd rate this pair as a 9 on the music ...