English
6
English
5
DESCRIPTION
SUB28D, SUB12D, SUB05D and SUB808D sub-woofer speakers are realized with Hybrid
Enclosure Technology (H.E.T.), developed by the dB Technologies labs.
The box in fact is made in light multilayer wood, coated in PVC and the sides are in
polypropylene.
The speakers of “SUB D” H.E.T. series use multichannel digital power amplifiers of last
generation DIGIPACK .
These highly efficient amplifiers provide high power with limited weight and dimension.
Thanks to the low power dissipated, the cooling of the amplifier module does not require a
fan.
The digital preamplifier with DSP (Digital Signal Processing) controls the audio crossover
of the acoustic components, the frequency response, the limiter, and the phase alignment.
The correct switch on of the amplifier is guaranteed by an initialization procedure; during
this test stage the LEDs (“LIMITER” and “ON SIGNAL”), located on the amplifier
module,stay on together for approx. 2 sec.
At the end of the switch on procedure, on the amplifier module, the “ON SIGNAL” green
LED flashes slowly, when there is signal absence.
During normal operation the “ON SIGNAL” green LED serves as Vu-meter monitoring the
audio level riproduced.
The "LIMITER" red LED lights up to indicate that the internal limiter circuit has tripped to
prevent amplifier distortion and protects the speakers against overloads.
SUB D (H.E.T.) are active sub-woofers designed for medium to large size rooms; are made
using “BAND PASS” so that high sound pressures can be achieved in compact dimensions.
These speakers are designed to function in stereo and in mono modes. It is possible to set
the frequency response and turning of phase (0° or 180°). The output signals can be linked
or controlled by X-OVER output.
For easy use, installation and transport, all subwoofers are provided with:
-
2 plastic handles on sides,
-
standard (D.36mm) pole mount plate on top of box.
CONTROLS AND FUNCTIONS
1)
" BALANCED INPUT 1” AND " BALANCED INPUT 2”INPUT CONNECTORS
Balanced inputs at line level. Accept “XLR” sockets.
2)
"
OUT 1
” AND "
OUT 2
” OUTPUT CONNECTORS
The “XLR” connectors be used to send the input audio signal to another amplified
speaker.
The signal is choosing between “LINK/XOVER” (8) switch.
3)
“LIMITER” INDICATOR LIGHT
This indicator shows red to indicate that the internal limiter circuit has tripped.
This prevents amplifier distortion and protects the speakers against overloads.
4)
“ON SIGNAL”
INDICATOR LIGHT
This indicator light comes on green to indicate that the amplifier is switched on and it
is working properly. The “ON SIGNAL” green LED flashes slowly, when there is
signal absence. During normal operation the LED serves as Vu-meter monitoring
the audio level riproduced.
5)
“SUBWOOFER SENSITIVITY” INPUT SENSITIVITY CONTROL
This control adjusts the sensitivity of the signal amplifier input.
This control does not affect the
"
OUT 1
” and "
OUT 2
”
outputs levels
6)
“PHASE” SELECTOR
This two-position switch permits turning the audio signal reproduced by the
subwoofer by 180°.
Rotation makes it easier to optimise the reproduction of the low frequencies even in
the most difficult installation situations. After completing installation, play a piece of
music and move the switch to achieve the best sound reproduction at low
frequencies.
7)
“SHAPE” SELECTOR
This switch selects the frequency response of the subwoofer. It is possible to choose
between two configurations: one makes the sound more deep and full of bass, one
for sound full of "punch".
8)
"LINK/XOVER" SELECTOR
This switch allows to select the signal type to send "OUT 1 ” and "OUT 2 ” outputs.
The “LINK” position allows to link the same input signal.
The “XOVER” position allows to send input signal cutted to 90Hz frequency.
9)
POWER SWITCH “POWER”
This switch can be used to switch the speaker on and off.
10)
FUSE CARRIER “FUSE”
Mains fuse housing. Replace only with identical value!
11)
POWER CABLE SOCKET “MAINS”
Used for connecting the power cable supplied.
AMPLIFIER PANEL (Ref. page 17)
WOOFER
WOOFER
SUB 05D
SUB 12D
WOOFER
SUB 808D
WOOFERS
SUB 28D
HANDLE
HANDLE
HANDLE
HANDLE
HANDLE
HANDLE
HANDLE
HANDLE
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
O 36mm PEDESTAL/
BRACKET HOUSING
O 36mm PEDESTAL/
BRACKET HOUSING
O 36mm PEDESTAL/
BRACKET HOUSING
O 36mm PEDESTAL/
BRACKET HOUSING
PROTECTIONS
Cooling
Thermal control is provided by the internal DSP, by means of one sensor, controls the
temperature of the amplifier, avoiding overheating by limiting the overall volume.
In case of overheating (> 90°C) the volume decreases proportionally to the temperature
increase, making the change unnoticeable.
The correct volume and all the functions are automatically restored when standard
operating temperatures are reached.
