Owner’
s Manual
13
Owner’s Manual
Smart Protect
There are advanced DSP protection mechanisms
designed into the DLM12S to safeguard the subwoofers
and amplifiers from inadvertent damage.
The protection circuits are designed to
protect the subwoofers under reasonable
and sensible conditions. Should you choose
to ignore the warning signs [e.g. excessive distortion],
you can still damage the speaker in the DLM12S by
overdriving it past the point of amplifier clipping.
Such damage is beyond the scope of the warranty.
Limiting
The driver has its own compression circuit which
helps protect it from damaging transient peaks.
The compressor is designed to be transparent and
is not noticeable under normal operating conditions.
The front LED will pulse when in limit. Turn the
volume down!
Overexcursion Protection
A 36 dB/octave high-pass filter at 32 Hz just prior
to the low-frequency amplifier prevents very low
frequencies from being amplified. Excessive
low-frequency energy below 29 Hz can damage the
woofer by causing it to “bottom out,” also know as
overexcursion, which is equivalent to a mechanical
form of clipping.
Thermal Protection
All amplifiers produce heat. The DLM12S is designed
to be efficient both electrically and thermally.
The amplifier module has internal heatsinks and
a digitally controlled variable speed fan. As the DSP
recognizes varying internal heat levels, it will turn
on at an appropriate speed to draw cool air in over
the amplifier and exit via the side vents.
In the unlikely event of the amplifier overheating,
a built-in thermal switch will activate, muting the
signal and ramping the fan up to top speed. An error
message will also appear on the OLED Display.
When the amplifier has cooled down to a safe
operating temperature, the thermal switch resets itself,
and the DLM12S subwoofer resumes normal operation.
If the thermal switch activates, try turning down the
level control a notch or two on the mixing console (or
the back of the subwoofer) to avoid overheating the
amplifier. Be aware that direct sunlight and/or hot stage
lights may be the culprit of an amplifier overheating.
FYI
The FYI screen displays the latest UI version, DSP
version, Amp B+ [voltage] and current temperature.
Nothing may be changed or updated here, just an FYI,
as stated. This screen is displayed when pressing the
VOL [10] and MEM buttons [14] simultaneously.
AC Power
Be sure the DLM12S subwoofer is plugged into an
outlet that is able to supply the correct voltage specified
for your model. It will continue to operate at lower
voltages, but will not reach full power.
Be sure the electrical service can supply enough
amperage for all the components connected to it.
We recommend that a stiff (robust) supply of AC
power be used because the amplifiers place high
current demands on the AC line. The more power that is
available on the line, the louder the speakers will play
and the more peak output power will be available for a
cleaner, punchier bass. A suspected problem of “poor
bass performance” is often caused by a weak AC supply
to the amplifiers.
Be aware of any error messages that may be displayed
on the OLED Display. Overvoltage, for example.
Never remove the ground pin on the power
cord or any other component of the DLM12S
subwoofer. This is very dangerous.
