Tips And Tricks; U.C.A.S Alpha Accessories; Troubleshooting - HK Audio L.U.C.A.S alpha Manual

4 Tips and Tricks

• Do not expose electronic circuitry to moisture!
When you set the system up outdoors, be sure to
protect it against rain. Keep soft drinks, beer, and
any other liquids away from the cabinets to prevent
short circuits.
• Place the subwoofer well away from walls and
ensure it isn't covered by curtains and the like. This
is vital to keep the power amps cool.
• Ensure the vents on the subwoofer's side panels
are free of debris and fans can rotate freely. Other-
wise, electronic components may overheat and
suffer damage.
• L.U.C.A.S ALPHA delivers optimum sound, so
you should provide it with optimum input signals!
Noise such as humming is generally caused by
defective cables, the wrong type of cords, or un-
balanced signals routed into the mixing console.
Check all signal and mains cables.
• Prevent distortion! Not only is it unpleasant to your
audience's ears, it also endangers your equipment.
Make sure all components that are connected
directly and indirectly to L.U.C.A.S ALPHA have
sufficient power ratings, and that they don't distort
because they're running at their respective limits.
Provide an undistorted signal to the system that
doesn't have to be cleaned up by backing off the
Gain knob.
• Avoid ground loops! You may encounter a ground
loop when the mixer is grounded via a mains cord
which isn't connected to the same mains circuit as
L.U.C.A.S ALPHA. To prevent this problem, always
connect the L.U.C.A.S ALPHA system and the
mixing console to the same electrical circuit (same
phase!). If your equipment hums despite this pre-
caution, the Ground switch can be a great help.
CAUTION: Never tape over the plug's ground termi-
nal – this endangers lives!
5 L.U.C.A.S ALPHA Accessories
HK AUDIO Speaker Add On Package
This is the complete L.U.C.A.S ALPHA accessory kit
consisting of two aluminum cabinet tripods, one gig
bag, and two speaker cords.
HK AUDIO Protective Covers for L.U.C.A.S ALPHA
This set comprises one cover for the subwoofer
and two covers for the satellites. Tear-resistant
and water-repellant, these rugged bags are thickly
padded to afford lasting protection for the L.U.C.A.S
ALPHA system during transport.
To learn more about Original HK AUDIO
Accessories, talk to your HK AUDIO dealer or visit
www.hkaudio.com.

6 Troubleshooting

The display does not light up when you power up.
1 Check if the PowerCon mains cord is plugged into
the Mains Input.
2 Check if the mains power supply is providing
current.
The display lights up, but no sound is issuing from
the cabinets.
1 Check the cords connected to the Left and Right
inputs.
2 Check if the signal sources (mixer, keyboard, CD
player) are on.
3 Is the Gain knob turned up?
4 Check the speaker cords for defects.
5 Check if the Speakon connectors are engaged
in their sockets (rotated to the right). The must
be locked in place to establish an electrical
connection.
The subwoofer's low frequency output is weak.
1 Check the setting of the Subwoofer Level knob.
Adjust this knob to set the volume of the sub-
woofer to the desired level.
The rendered signal sounds distorted.
1 Check the LED displays on your mixer. They should
not be constantly in the red. If necessary, back off
the volume at the mixer.
2 If the LED displays on your mixer are in the green,
back off L.U.C.A.S ALPHA's Gain knob.
3 Observe the LEDs of the Limit Left, Limit Right and
Limit Subwoofer displays on L.U.C.A.S ALPHA's
control panel. These may light up yellow, but only
intermittently. Under no circumstances may they
continuously illuminate yellow. If this is the case,
turn down the Gain knob.
Annoying humming
1 Check the cords connecting the signal source to
L.U.C.A.S ALPHA. Replace defective cords.
2 If you cannot pinpoint the cause of the humming,
engage the Ground switch. This should remedy the
problem in most cases.
Level problems
1 Check the Sensitivity switch's setting. When it is
set to +4 dB, and you feed in a signal with a level
of +4 dB (for example, from a connected mixing
console), the system delivers 0dB output level.
This lets you take advantage of the system's full
dynamic range. When it is set to -6 dB, and you
feed in a signal with a level of -6 dB, the sys-
tem delivers 0 dB output level. This boosts the
system's output level by 10 dB, but reduces the
dynamic range at higher volumes. This is why
we recommend running the rig at +4 dB in live
situations.
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