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At 40 Hz, THD+N is an extremely respectable 2.45% without the Turbo.
With the Turbo, slightly less than without, at 2.41%.
And, at 50 Hz, THD+N was 1.7% without the Turbo, and . . .
slightly less than 1.7% with the Turbo.
With no Turbo, the measured room response rolls off below 20 Hz.
But, with the Turbo, the room response is flat to about 12 Hz. This is superb. Remember though, you do pay a price in terms of THD+N for that extension at the low end. You have to decide what is best for you. As for myself, I would use the Turbo, since I really like that < 20 Hz stuff.
Conclusions The VTF-3 HO is, in my opinion, the best subwoofer Hsu Research has ever designed. Even if it were not relatively inexpensive, it would still be a good sub. But, at the 1 kilobuck price range, it is an incredible value.
- John E. Johnson, Jr. -
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