VTF-3 MK3 with Turbocharger
The new VTF-3 MK3 subwoofer takes advantage of the new technologies we developed for the HO series. The lowest bass comes from the port. You need large ports to move lots of low bass without port noise or compression. With the VTF-3 MK3, we went to dual 4" ports, which nearly doubles the port size compared to the VTF-3 Mk 2. Adding the patent pending turbo doubles the port area for extended bass mode, allowing the VTF-3 MK3 to move as much air as four VTF-3 MK2 models in extended bass mode with the same level of port noise.  Read MoreLow bass output in vented systems come from the port(s). High levels of low bass require a lot of air to be moved. If the port's crossectional area is not large, air velocity gets very high, resulting in turbulence (port chuffing) and compression. For a given enclosure volume, putting in a larger port means a longer port length to tune the port to the same frequency. In order to fit two 4" ports into an enclosure the size of the VTF-3 MK3,we need to bend the ports. However, if not bent properly, the bend will cause premature onset of turbulence, negating the purpose of going to a larger port.Our patent pending bent port technology ensures that our bent port performs as well as a straight port equivalent. Adding the patent pending turbo dramatically increases the low distortion low bass. With our previous VTF technology where the bass extension of the subwoofer is achieved by tuning the subwoofer 1/3 octave lower by cutting the port area in half, we achieved lower extension at the expense of maximum output with low port noise and compression. In the extended bass mode, the air now has to be squeezed through half the port area, doubling the air velocity. Port turbulence occurs at a much lower level. The turbo technology eliminates this deficiency by allowing both ports to remain open for the extended bass mode. Hence with the turbo, the VTF-3 MK3 can move the same amount of low turbulence air as two VTF-3 MK3s without turbo. This represent a dramatic cost and space saving. Industry Reviews"The ambient rumble was loud, the explosions were clean, and rocket engines blasted. Even when I pushed playback levels to "11" the sub complied with minimal protest. Turbo-assisted, it was extremely capable in the lowest octave.""If you want to know what a gigantic sea monster sounds like when it destroys a city, you can either be there or listen to it through a VTF-3 MK3 Turbo. ...When I cranked it up, it just got louder. ...Part of the fun of this kind of movie is feeling the room shake, and the Turbocharger really helps make it happen." "I have listened to this track on hundreds of subs, and rarely have I heard it reproduced so well. The lowest notes of the bass line were smooth at low and medium volume; even at very high volume, the sub was pretty tight and free of resonance. The upper notes had a good snap to them, with not a hint of sloppiness or blooming. This recording has a good low end but not huge amounts of rock-bottom energy; so the Turbo helped, but the VTF-3 MK3 also sounded pretty darn good without it." "It can dig down to an honest 16 Hz and play it both loudly and musically. The sound of the pipes was very realistic, with the entire harmonic structure, from fundamental on up, well balanced to produce a huge, natural sound. If you don't listen to organ music, or in general to material with content below 25 Hz, you probably don't need the Turbo; it's job is to augment the very bottom end, which it does superbly. — Ken C. Pohlmann , Sound and Visions, May 2007 |
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VTF-3 MK3 Turbo At a Glance
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