I sent email to Hsu Support,
"...As Steve Guttenberg said in a review of Hsu VTF-1 MK2 he preferred clean, highly defined Bass for Music Listening.
Tech Support replied..."You can try one port open, EQ2, Q 0.3."
To update my earlier post re: Hsu Subwoofer:
Widescreen Review, has been- June/July 2013.
"...I evaluated the VTF-2 MK4 using bass management in the
crossover-bypass mode (using an 80-Hz crossover in our Classé
controller tuned to the “small” designated surround Magnepan loudspeakers in our reference system). The VTF-2 MK 4 was connected to the Classé Audio SSP-880 Controller via a single-ended RCA connector from the subwoofer pre out to the input on the subwoofer and used the bass-management capability of the pre/pro.
Thus, the Classé was used to merge any .1 LFE with the bass from the other
seven loudspeakers and manage the delay of all loudspeakers and
the subwoofer through a distance/time delay function.
I positioned the subwoofer near my sweet spot listening position,
not in a corner.
I also used an SPL (sound-pressure level) meter to adjust levels. I
set the Q level (Qtc) at the preferred 0.5 in the sealed (both ports)
configuration (EQ2) to achieve a “critically damped” alignment with a
step response that has no overshoot. The total Q of the system (Qtc)
has a big effect on measured performance, and ultimately on what
you hear. Qtc defines the shape of the response curve and the
amount of damping to overshoot or ringing (oscillation after the signal
stops) that the system will provide
With music, the sound from the VTF-2 MK4 was exceptionally tight and tuneful,
with superb pitch definition and flawless rendering of the rhythm and pace of music.
The ability to deliver bass detail and articulation, and punch and snap is excellent on music and percussion..."
I also found this recommended Sound & Vision recording 2018 review..."One of my favorite music tracks for testing subs is “Flight of the Cosmic Hippo” by Béla Fleck and The Flecktones. Bassist Victor Wooten's solo, played on a five-string fretless Fodera bass, has him moving up and down the scale and reaching incredibly deep notes. Any discontinuity between your main speakers and the subwoofer is instantly heard, and only a tight, fast sub can sound tuneful..."
So, using my Hsu VTF2-Mk4 Subwoofer setup suggested by Kevin Hsu: Left Port Closed, Q Control=1, EQ=3, Phase=0, Hsu Bass Optimizer at 12dB Xover=80Hz(Fixed)to Magnepan LRSs, Volume=9-O'clock. My Emotiva PT-100 Pre and 300W/4ohm Amp I cranked up “Flight of the Cosmic Hippo”. For me it's the perfect blend of Bass for 2.1 channel Stereo. End result on my 2.1 is tight, deep but musical (No Thumping) Bass. Wow...wow...wow!