Hello and Happy New Year,
I returned to the warmth of tubes with the addition of a Prima Luna EVO 400 integrated amp for my music system rig. I added a HSU VTF-TN1 sub primarily for the movie surround to add more low end as an adjunct to my smaller/older HSU VTF-MK 2. For more details on the subs you might check out
I'm fortunate to reside about 30 minutes from Dr. Hsu's facility. He's a brilliant engineer (MIT PHD) designing, building subs for over 40 years and loves to talk subwoofer. Oh and he answers the phone (or his main assistant, Kevin. Enjoy the music!