HSU ULS-15 User Manual
Subwoofer Manual
Features
Wireless Technology.
Contrary to popular belief, subwoofer placement is critical in order to achieve optimal sound quality. Incorporating
wireless technology in our subwoofer greatly enhances your ability to position the subwoofer for optimal performance
while still keeping the spouse happy.
This woofer uses a patented XBL2 ™ motor design that has an incredibly linear motor force. The motor force (BL)
stays within 2% over a wide +/- 20 mm excursion. Most woofers with Xmax of +/- 20 mm would be lucky to have
the BL within 2% over a +/- 5 mm range!
A very high headroom BASH®amplifier is used to fully utilize the ultra low distortion, ultra high output capability of
the woofer. This amplifier is capable of delivering up to 1000 W rms short- term power.
Now included are more connectivity options than any other subwoofer we know of, at any price! Inputs include
balanced XLR, unbalanced RCA, wireless, and speaker level. This flexibility allows you to use the subwoofer in
recording studios, high end two channel systems, and state-of-the-art home theater systems.
Traditionally it has been difficult to get loud, clean, ultra deep bass from a compact enclosure. The ULS-15 changes
that. It gives you loud, clean, ultra deep bass from a compact, beautifully-finished enclosure.
An Ultra Low Frequency (ULF™) trim control allows you to maintain accurate deep bass response in virtually any
room, no matter what shape or size.
Ultra Linear Woofer.
Powerful BASH®Amplifier.
Great Connectivity.
Compact Enclosure.
Accomodates All Room Sizes.
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10. Protect the power cord from being
NO USER SERVICEABLE
PARTS ARE INSIDE.
walked on or pinched particularly at
plugs, convenience receptacles, and the
point where they exit from the apparatus.
11. Unplug this apparatus during
lightning storms or when unused for
long periods of time.
12. Refer all servicing to qualified service
personnel. Servicing is required when
the apparatus has been damaged in any
way, such as power-supply cord or plug
is damaged, liquid has been spilled or
objects have fallen into the apparatus,
the apparatus has been exposed to rain or
moisture, does not operate normally, or
has been dropped.
The lightning flash with arrowhead symbol within an equilateral triangle is
intended to alert the user to the presence of uninsulated “dangerous voltage”
within the product’s enclosure that may be of sufficient magnitude to constitute
a risk of electric shock to persons.
Le symbole éclair avec point de flèche à l’intérieur d’un triangle équilatéral
est utilisé pour alerter l’utilisateur de la presence à l’intérieur du coffret de
“voltage dangereux” non isolé d’ampleur suffisante pour constituer un risque
d’éléctrocution.
The exclamation point within an equilateral triangle is intended to alert the
user to the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the product.
Le point d’exclamation à l’intérieur d’un triangle équilatéral est employé pour
alerter les utilisateurs de la présence d’instructions importantes pour le
fonctionnement et l’entretien (service) dans le livret d’instruction
accompagnant l’appareil.
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus
near water.
6. Clean only with dry cloth.
7. Do not block any ventilation
openings. Install in accordance with
the manufacturer's instructions.
8. Do not install near any heat sources
such as radiators, heat registers, stoves,
or other apparatus (including amplifiers)
that produce heat.
9. Do not defeat the safety purpose of
the polarized or grounding-type plug.
A polarized plug has two blades with
one wider than the other. A grounding
type plug has two blades and a third
grounding prong. The wide blade or
the third prong are provided for your
safety. If the provided plug does not fit
into your outlet, consult an electrician
for replacement of the obsolete outlet.
13. WARNING: To reduce the risk of fire
or electric shock, this apparatus should
not be exposed to rain or moisture and
objects filled with liquids, such as vases,
should not be placed on this apparatus.
14. To completely disconnect this
equipment from the mains, disconnect
the power supply cord plug from the
receptacle.
15. The mains plug of the power supply
cord shall remain readily operable.
TABLE OF
CONTENTS
UNPACKING . . . . . . . . . . . . .3
PLACEMENT . . . . . . . . . . . .3
HOOKUP . . . . . . . . . . . . . . .4
AMPLIFIER PANEL . . . . . . .5
VOLUME LEVEL . . . . . . . . .6
CROSSOVER . . . . . . . . . . . .6
FINE TUNING . . . . . . . . . . . .6
TROUBLESHOOTING . . . . .8
REPAIR . . . . . . . . . . . . . . . . .9
SPECIFICATIONS . . . . . . . .10
WARRANTY . . . . . . . . . . . .10
Set-Up
Step 1: Unpacking
Before unpacking, inspect the carton for puncture holes, crushed corners, etc. Take photos of any potential
shipping damage before proceeding to unpack. Take note of which corner or wall the damage is on so you
can check the corner/side of the subwoofer nearest the external damage.
This subwoofer is very heavy. Be sure to get someone to help you unpack. If you have a hard floor, unpack
the subwoofer on a throw rug or blanket to avoid unwanted scuffing or scratching. Find the top of the box
and open it. Holding the flaps open, roll the box over until it is upside-down. Lift the box off.
Lift the subwoofer off the foam corners and place it on the carpet/blanket. Remove the protective bag and
inspect for damage. If all looks fine, turn the subwoofer so the bottom faces up (the face with the four screw
holes). Screw in the feet. If the subwoofer has a protective stick-on plastic, leave it on until you decided to
keep the subwoofer for good. Any returned product with scratches, etc. will be subject to a restocking fee.
Upright the subwoofer and move it to the desired location.
Step 2: Placement
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Avoid placing the subwoofer
halfway between the front
and back walls. Avoid sitting
there as well.
Contrary to popular belief, placement is extremely important. It can dramatically affect the bass
quality and quantity. An optimally placed subwoofer is much more powerful and better sounding
than a poorly placed one.
Important Guidelines
• This subwoofer does not have magnetic shielding and has a HUGE magnet (35 lbs!). Keep the subwoofer at least 5 ft away from CRT TVs or video displays. LCD, plasma, and DLP TVs are not
affected, and the subwoofer can be placed next to these items with no magnetic interference. Keep
the subwoofer at least 2 ft away from computers in order to prevent the hard drive from being erased.
Rules of thumb for placement
• Avoid the center of the room: In general, avoid placing the subwoofer half way between the front
and back walls. You should avoid sitting in the middle as well.
• Use near-field placement: You get the tightest upper bass and the most punch if you can place the
subwoofer close to you. By being close to the subwoofer, you get high SPL without requiring a lot
of power. This helps to minimize annoyance to your neighbors as well. The direct- to- reflected ratio
is also higher, helping to reduce room effects. One situation where near-field placement may not work
best is when your room is very shallow. In a shallow room (less than 15 ft front to back), placing the
sub close to you will lead to a dip in the low bass response.
• Corner placement: If near-field placement is not optimal, then corner placement is a great alternative.
A front corner furthest from openings is generally optimal for deep bass reproduction.
• Placement in entertainment centers: This is acceptable as long as you can fire the woofer straight
into the room, and you have at least 1˝ spacing on the sides, top and back (measured from the heat
sink). The air in the cavity must be able to circulate with the outside air to get proper cooling. Make
sure the entertainment center will not vibrate and rattle. Use the rubber feet if placing the subwoofer
in an entertainment center.
• Direct line of sight between subwoofer and wireless transmitter: If you are using the wireless
connection, the signal is most reliable if there is nothing blocking the subwoofer from the wireless
transmitter. Also, the transmitter should not be too close to the ground, preferably 18˝ or higher. Do not
worry too much if these criteria cannot be met. We have tested thise subwoofer with the transmitter on
Corner and nearfield
placement usually sound best.
the ground, and in a room with four walls between the transmitter and the subwoofer, and the wireless
technology still works fine.
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Step 3: Hookup
We will refer to receivers, integrated amplifiers, and preamps as controllers. Take a look at the back of your controller.
The output connectors available determine the best method
of hooking up your subwoofer.
Method A. Connecting to controllers
with a SUBWOOFER or LFE output
If you have this, you should use it. All Dolby Digital, DTS,
THX, and Dolby True HD equipped controllers have a low
level Subwoofer pre-out (not to be confused with a subwoofer
input – many customers have hooked up their subwoofer to
the subwoofer input on their controller only to get no sound!).
This offers the easiest and best connection.
Connect the subwoofer pre-out to both inputs on the wireless transmitter using a splitter.
Set the wireless channel on the transmitter so that it is the same as that on the subwoofer.
Set the wired/wireless switch on the subwoofer to ‘Wireless
as practical, and away from metal surfaces if possible.
Wired Connection
Connect the subwoofer pre-out to either one of the two
RCA low level inputs on the subwoofer. If your controller has a balanced output, connect to either one of
the two XLR balanced inputs.
Enable your subwoofer out on your controller. We highly
recommend setting all your speakers to SMALL so all
bass will be routed to the subwoofer, freeing the main
amp and main speakers from the rigorous demands of
reproducing bass.
Method B. Connecting to controllers with HIGH LEVEL speaker outputs.
Wireless Connection
’. Place the transmitter as high
Use this method only if you do not have any other choice. Integrated amplifiers or stereo receivers with no pre-outs fall in this category.
The subwoofer will operate in bass augmentation mode. i.e., the main speakers will be running full-range. You dial in the subwoofer to
come in just where the main speakers start to fade out. Since the subwoofer uses its own amplifier, and has a high input impedance, it
will not alter the loading on your main amplifier.
It is important to know if your controller has true ground or not. Bridged amplifiers, and amplifiers like Carver (which inverts phase to
one channel making their black terminal on one channel the signal instead of ground) should not be used. Similarly, digital amplifiers
that have unfiltered outputs are also not suitable.
Since the subwoofer will not be drawing any significant current, any gauge wire will do. No need for heavy gauge wires.
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