HSU Research has a rather loyal fanbase that has been waiting with bated breath for the introduction of a new flagship subwoofer. You can exhale kids. The new subwoofer is the 15″ ported VTF-TN1, which is slotted into their lineup as a replacement for their VTF-15H MK2.

The TN1 looks to earlier HSU Research subs such as TN1220HO and TN1225HO that were inspired by the design philosophy of the late Tom Nousaine. However, Dr. Poh Ser Hsu is the founder and technical guru of the company.

Dr. Hsu with HSU Research VTF-TN1 Subwoofer

Features

HSU Research has designed the VTF-TN1 to provide the ultimate home theater experience with higher output and deeper bass than previous models. 

The new flagship incorporates a 15-inch driver in combination with dual 4-inch down-firing ports that extend lower frequency output further as a result of Variable Tuning Frequency (VTF) technology. The way VTF works is that the subwoofer has two ports that can be plugged up if desired. When one port is plugged, the subwoofer has the deepest bass response. However, if both ports are unplugged, the overall subwoofer output increases, but the subwoofer won’t go as deep.

What is Variable Tuning Frequency (VTF)?

In addition, Q-control adds another layer of adjustment that fine-tunes bass tightness.

Connectivity includes balanced XLR, unbalanced RCA, and high-level inputs for integration flexibility with all types of audio systems. 

Tip: Balanced XLR inputs protect against noise caused by RF interference, RMI, etc for usage in high-end audio and professional audio (studio, live sound environments).

The VTF-TN1 also has a taller body than previous models.

Dual HSU Research VTF-TN1 Subwoofer in Home Theater Lifestyle Angle

Compared to other HSU subs, the VTF-TN1 differs in the following ways (also check out the specification comparison and product links in the provided table below):

  • Larger enclosure than the VTF-3 MK5 HP, so more efficient in the deeper bass
  • Larger ports at a lower tuning than the VTF-3 MK5 HP, so it not only plays louder and cleaner with sub 20 Hz bass (less port noise) but also lower.
  • Plays significantly louder and cleaner than the VTF-2 MK5 across the board (like having two of the VTF-2 MK5’s put together) with low distortion.
  • Plays significantly louder and cleaner than the ULS-15 MK2 in the deeper bass (like having two ULS-15 MK2’s put together) with low distortion.
  • Among the smallest footprint – similar to the ULS-15 MK2.

Tip: The VTF-TN1 can also be laid on its side if preferred. Less deep than most sofas, this sub makes a good end table without affecting sound quality,

Dual HSU Research VTF-TN1 Subwoofer in Home Theater Lifestyle Front
Dual HSU Research VTF-TN1 Subwoofers with HC-1 / HB-1 MK2 Center / Bookshelf Speakers.

Comparison

VTF-TN1 VTF-2 MK5 ULS-15 MK2 VTF-3 MK5 HP VTF-15H MK2
Price $1,199 $689 $989  $999 $1,249 
Woofer Driver Front Firing
15-inch
Front Firing
12-inch
Front Firing
15-inch
Front Firing
15-inch
Front Firing
15-inch
Amplifier Power (RMS) 2000 W Short Term
600 W Continuous
1400 W Short Term
350 W Continuous
2000 W Short Term
600 W Continuous
2000 W Short Term
600 W Continuous
2000 W Short Term
600 W Continuous
Hybrid Tuning 15 Hz Ported
20 Hz Ported or Sealed
18 Hz Ported
22 Hz Ported or Sealed
20 – 200 Hz, +/-1 dB 18 Hz Ported
22 Hz Ported or Sealed
16 Hz Ported
22 Hz Ported or Sealed
Low-End Extension (+/- 2 dB) 14 Hz (1 port open)
18 Hz (2 ports open)
16 Hz (1 port open)
22 Hz (2 ports open)
20 Hz 17 Hz (1 port open)
22 Hz (2 ports open)
16 Hz (1 port open)
21 Hz (2 ports open)
Q Control Range 0.3 – 0.7 0.3 – 0.7 0.3 – 0.7 0.3 – 0.7 0.3 – 0.7
Crossover 30-120 Hz, Bypassable 30-90 Hz, Bypassable 30-90 Hz, Bypassable  30-90 Hz, Bypassable 30-90 Hz, Bypassable
Crossover Slope 24 dB/Oct 24 dB/Oct 24 dB/Oct 24 dB/Oct 24 dB/Oct
Phase 0°/180° 0°/180° 0°/180° 0°/180° 0°/180°
Inputs Line Level (2)
Speaker Level (2)
Balanced XLR (2)
Line Level (2)
Speaker Level (2)
Line Level (2)
Speaker Level (2)
Balanced XLR (2)
Line Level (2)
Speaker Level (2)
Line Level (2)
Speaker Level (2)
Balanced XLR (2)
Power Outlet Requirement 720 W, 120/240V 430 W, 120/240V 720 W, 120/240V 720 W, 120/240V 720 W, 120/240V
Enclosure Dimensions  (HxWxD) 29.5 x 18.5 x 18.5 inches 20 1⁄2 x 15  x 22-inches 18 x 18  x 18 inches 24 x 17 1⁄4  x 21 1⁄2-inches 24 x 18 x 26 inches
Enclosure Dimensions
with Grill, Feet, and Amp
(HxWxD)
Not provided 21 1⁄2  x 15  x 24 inches 19 x 18 x 19 1⁄2 inches 25 x 17 1⁄4  x 24-inches 25 x 18 x 28 1⁄2-inches
Weight 85 lbs 62 lbs 65 lbs 85 lbs 110 lbs

Price & Availability

The HSU Research VTF-TN1 Subwoofer will start shipping on April 12th for $1,199. Pre-order now with a $200 non-refundable deposit and receive $50 off (while supplies last) via the HSU Research Website. 

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The VTF-TN1 comes with a furniture-grade smooth satin black painted finish. The warranty for all subwoofers is 7 years on the woofer and 5 years on the electronics.

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