VTF-1 MK3 Subwoofer

Once again we are giving you even better bang for your buck - the new MK3 has improved performance, AND costs less!

With the new VTF-1 MK3, we have improved the performance over the MK2 while lowering it's price!

With the MK3, we have made it a front firing design. It now comes with rubber feet to help eliminate issues with feet buzzing against a hard floor.

As with all our current VTF series subwoofer, it has hybrid tuning, variable Q, sealed operating modes – making this one of the most flexible subwoofers on the market we have offered to date, catering to virtually any audiophile’s preferences.

Harnessing the unique Variable Tuning Frequency port technology (VTF), each port uses the air generated from the long throw woofer to dramatically boost the deeper frequencies. Both ports have enormous flares to virtually eliminate port noise and distortion.

The reason for variable tuning is that all subwoofer designs, especially consumer-level subwoofers, involve tradeoffs in design. You cannot have a small subwoofer that goes very low, plays very loud and costs very little. Traditionally, the engineer decides what tradeoff he or she thinks is best for the consumer. The consumer has to take it or leave it.

The VTF-1 MK3 changes all that. It allows you, the user, to choose the tradeoff. If you enjoy music that is loud but does not have much deep bass, set the VTF series for maximum output. That way, you get maximum dynamic range with the lowest distortion. If you like music with deep bass, set it for maximum bass extension to reproduce the deep bass accurately. If you prefer a sealed subwoofer, you get that too. In addition, we have added the Q control which allows you to adjust how tight you want the bass to be. That means effectively you get many different subwoofers for the price of one!

VTF-1 MK3 Frequency Response - Ported (1 port open, 'EQ1')

Freq Response Curve

VTF-1 MK3 Frequency Response - Ported (2 ports open, 'EQ2')

Freq Response Curve


CEA 2010 Measurements (1 Meter, Peak)

VTF-1 MK3 One Port Open :

Tone Burst Center Frequency (Hz) Maximum SPL CEA 2010 Rating
20 100.2 107.7
25 109.7
31.5 113.3
40 115.0 117.3
50 117.8
63 119.0
80 118.6

VTF-1 MK3 Two Ports Open:

Tone Burst Center Frequency (Hz) Maximum SPL CEA 2010 Rating
20   108.2
25 103.0
31.5 113.3
40 119.3 120.4
50 120.6
63 121.2
80 119.7


Industry Reviews

"Amazing sound, the 2.1 package (CCB-8 plus VTF-1 MK3) totals only $1100. One of the budget leaders among the uber showings here at the 2017 AXPONA"

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James Larson, source, April 27, 2017


Steve Guttenberg just reviewed the VTF-1 MK2 on CNET! - click on link below to see the article:

Read Full Article

Steve Guttenberg, CNET, November 18, 2012


"The VTF-1 is an improved version of the VTF-2 that the following magazines raved about: "On a per-dollar basis, direct from the factory, the VTF-2 is the best subwoofer known to me"

Peter Aczel, Audio Critic Magazine


"made my jaw drop....the overall performance of the VTF-2 (in the 25Hz tuning configuration) could be reasonably compared to the performance of the $3,000 B& W ASW 4000....a performance benchmark to which other under-$1,000 subwoofers must be compared."

Richard Hardesty, Widescreen Review Subwoofer Buyer's Guide


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"Reviewer's Choice Award 2000"

Sound & Vision


"...may be the best-bang-for the buck "true" subwoofer you can buy."

Howard Ferstler, The Sensible Sound


"Best performer in a comparison test."

Tom Nousaine, Sound & Vision


"[A] best buy in subwooferdom."

Robert Deutsch, Stereophile Guide to Home Theater


"...if you're looking for more bounce from your audio bucks, the Hsu Research VTF-2 powered sub has no equal."

Steve Guttenberg, Audio


"awe-inspiring...I enjoyed more soundstage depth, more thereness, more realism. This spoke louder about the VTF-2's bass quality and inherently low distortion than thunderous SPL output levels (of which, incidentally,it is also quite capable)... a sure-fire recommendation for anyone who has superior monitors or even tower speakers and wants to add quality and quantity bass."



Black (vinyl)


Dual Drive Black (vinyl)


Product At a Glance

Amplifier Power (RMS) 1000 W Short Term, 250 W Continuous
Hybrid Tuning 25 Hz Ported,32 Hz Ported or Sealed
Low End Extension (+/- 2 dB)

22 Hz (1 port open)

32 Hz (2 ports open)

Woofer Front Firing 10 Inch
Q Control Range 0.3 - 0.7
Crossover 30 - 90 Hz, Bypassable
Crossover Slope 24 dB/Oct
Phase 0°/180°
Inputs Line Level (2), Speaker Level (2)
Power Outlet Requirement 300 W, 120/240V
Enclosure Dimensions 18.5" H x 14.5" W x 17" D
Dimensions with Grill, Feet & Amp 19.5" H x 14.5" W x 19" D
Weight 42 lbs
Warranty 7-years on Woofer, 2-years on Electronics
Designed and Engineered in the U.S.A.


Quick Set-Up
Owners Guide

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