HSU ULS-15 Manual Download Page 2

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

2

NO USER SERVICEABLE

PARTS ARE INSIDE.

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.

10. Protect the power cord from being

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. 

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. 

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. 

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

Summary of Contents for ULS-15

Page 1: ...ze 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 Great Connectivity 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...

Page 2: ...ly 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 ap...

Page 3: ...bwoofer 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...

Page 4: ... 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 am...

Page 5: ... automatically go into STANDBY mode Crossover Defeat Switch If you are using a SUBWOOFER or LFE output you can disengage the crossover by switching it to OUT The crossover should be switched to IN when using high level inputs or two channel low level inputs Crossover Frequency Control This low pass crossover controls what frequencies are handled by the subwoofer ULF Trim This compensates for room ...

Page 6: ...r than for music 3 dB higher is a good choice if your receiver allows you to set levels for each source Step 5 Crossover If your controller has bass management and has a steep crossover slope set the crossover switch on the subwoofer to Out If your controller has a gentle crossover slope 12 dB Oct or less set the crossover switch on the subwoofer to In and set the crossover fre quency knob on the ...

Page 7: ...level down 5 dB 7 If your controller has a subwoofer out level use this to adjust the level If it does not play the 50 Hz tone and adjust the subwoofer volume control to get the desired change in level If you are using the Radio Shack SPL meter compensate for the meter s deep bass deficiency The older analog Radio Shack meters are down 12 dB at 16 Hz 7 dB at 20 Hz 4 dB at 25 Hz and about 2 dB down...

Page 8: ...pick up noise Try another interconnect or speaker wire Also move the signal cable away from AC cables power transformers or other EMI sources Use an AC line filter or plug the unit into a different circuit If hum goes away when interconnects are disconnected the hum is coming from the rest of your equipment Add them back one piece at a time The one that causes the system to hum is the source of th...

Page 9: ...reless Make sure the channel selection are the same on the trans mitter and receiver Check and see if the led above the Wireless Wired switch is lit up solid green If not move the antenna transmitter and subwoofer to get better reception If you are using the wired con nection make sure the Wired Wireless switch is set to Wired With the volume on the subwoofer turned to a low setting try plugging t...

Page 10: ... states do not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above limi tations and exclusions may not apply This Warranty Does Not Cover Damage caused by abuse accident mis use negligence or improper operation Products that have been altered or modified Any product whose serial number has been ...

Page 11: ...11 Notes ...

Page 12: ...12 HSU Research 985 N Shepard St Anaheim CA 92806 1 800 554 0150 HSURESEARCH COM ...

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