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VTF-15H Subwoofer Manual
Features
Variable Tuning Hybrid Technology.
"Now you decide how deep to play." The large flared triangular ports can be re-tuned with the flip of a switch
and the addition or removal of a port plug(s). With support for five different operating modes, including ported
and sealed hybrid modes, this subwoofer offers state-of-the-art performance in virtually all rooms.
Custom built woofers.
"The end of featureless boom." We design our woofers from the ground up to have exceptionally flat response
and low distortion, so you will hear clean and detailed bass not found in lesser subwoofers.
Powerful BASH amplifiers.
Our custom built amplifiers have ultra-high headroom, soft clipping, subsonic filtering, adjustable Q, and
class A/B output stage to provide extremely high fidelity, low distortion, and high output.
Flexible room placement.
The luxurious and smooth non-vinyl finishes, rounded corners and edges, and front-firing woofer and ports
allow for close placement next to listeners, in corners, and even inside built-in entertainment centers.
Connects to almost any system.
"Integration is easier than ever." Thanks to modern receivers that use Dolby Digital, DTS, THX, or Bass
Management, you can connect the subwoofer to your system with one cable. If you have invested in a stereo-
only system, integration is also simple thanks to true 24 dB/Oct. crossovers.

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Summary of Contents for HSU VTF-15H

  • Page 1 VTF-15H Subwoofer Manual Features Variable Tuning Hybrid Technology. “Now you decide how deep to play.” The large flared triangular ports can be re-tuned with the flip of a switch and the addition or removal of a port plug(s). With support for five different operating modes, including ported and sealed hybrid modes, this subwoofer offers state-of-the-art performance in virtually all rooms.
  • Page 2: Table Of Contents

    10. Protect the power cord from being NO USER SERVICEABLE walked on or pinched particularly at plugs, convenience receptacles, and the PARTS ARE INSIDE. point where they exit from the apparatus. 11. Unplug this apparatus during lightning storms or when unused for long periods of time.
  • Page 3: Unpacking

    Stop for a moment to inspect the subwoofer for any damage that may have occurred during shipping. If there is damage to the subwoofer underneath, or if there are missing items, notify HSU Research within one business day. We will help you find a solution.
  • Page 4: Hookup

    If your system (a) has a MAIN-IN connected with a metal jumper to a PRE-OUT, or (b) you have an external amplifier, you can purchase our HSU High Pass Box for the added benefit of keeping the bass out of your speakers. Please contact HSU Research for details.
  • Page 5: Volume Level

    Turning the subwoofer ON for the first time On the subwoofer, check that the phase switch is at 0 degrees, the volume level knob is at the minimum, and the crossover is at 90 Hz if using the subwoofer’s crossover. Run the power cord from the wall to the subwoofer and flip the power switch to the AUTO-ON or ON position.
  • Page 6 25 Hz, and 2 dB down at 31.5 Hz. Add these numbers to the readout on the SPL meter to compensate. 1) Using a test disk with one-third octave filtered pink noise or warble tones (such as the Hsu/BAS Test CD-1), play the 50 Hz test tone and adjust the master volume level on the controller so that the SPL meter reads 80 dB at the listening position.
  • Page 7: Troubleshooting

    Troubleshooting If you think your subwoofer has a problem, please do everything you can to confirm the problem before contacting us for service, including reading through the troubleshooting section. Many times the problem actually is caused by other items in the system or the subwoofer’s interaction with those items.
  • Page 8: Repair

    Problem Cause Solution The subwoofer is not receiving a • Recheck the connections between the source and the subwoofer. signal. No output from the • With the volume on the subwoofer turned to a low setting, try subwoofer (LED plugging the subwoofer directly into a CD player or lightly touching lights up red).
  • Page 9: Specifications

    HSU’s liability for any defective product is limited to repair or replacement of the prod- Warranty service must be performed by uct at our option. HSU shall not be liable for Hsu Research or an authorized service incidental or consequential damages of any center.
  • Page 10 Notes...
  • Page 11 Notes...
  • Page 12 HSU Research 985 N. Shepard St. Anaheim, CA 92806 1-800-554-0150 HSURESEARCH.COM...