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Subwoofer Manual
MK 4
Features
Variable Tuning Hybrid Technology.
"Now you decide how deep to play." The large flared 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 for sound quality, 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 finish, rounded corners, and overall design allows for close placement
next to listeners or discreet placement in corners.
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 low pass filters.

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Summary of Contents for HSU VTF-3 MK 4

  • Page 1 Subwoofer Manual MK 4 Features Variable Tuning Hybrid Technology. “Now you decide how deep to play.” The large flared 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 protective bag for any rips or tears that may have occurred during shipping. If there is damage to the subwoofer underneath, or if there are missing items, notify HSU Research as soon as possible. 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. Step 4: Volume Level Set the volume knob to the 9 o’clock position to start.
  • Page 6 Setting the Phase Depending on the absolute phase of your main speakers and amplifier, and the distances of the subwoofer and the main speakers from the listening position, the bass in the crossover region may be smoother if you reverse the phase of the subwoofer. Switch the phase switch to 180 degrees to see if the bass sounds louder in the seating 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 • Set the subwoofer level to minimum. Use a different RCA cable to subwoofer (LED hook the sub to a DVD player's analog output or to an MP3 player. lights up red).
  • Page 9: Specifications

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

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