Proel LT812A - Manuale (Pagina 10)

10
GENERAL INFORMATION
Thank you for having chosen a PROEL product.
The LT812A by PROEL is a combined ac ve and passive speaker system with plywood cabinet off ering the renowned
PROEL sound and a high-level performance in a reliable and aff ordable package. LT812A is a fully amplifi ed system
formed of LT812SUB ac ve subwoofer for the low band, it includes the sat amplifi ers, and two LT812SAT passive speakers
for the mid-high range. For the construc on of the cabinets we have used plywood, a very lightweight and durable
material that makes moving and installing these speakers very quick and easy. Strong, an -scratch paint and steel grilles
with an internal foam layer provide proper protec on for years of service. The dual-angle pole holder featured in the
LT812SAT off ers the possibility to obtain a more uniform coverage of the audience.
For the high frequency reproduc on of LT812SAT we have designed wide-dispersion horn, able to provide constant
coverage for large audiences and detailed response with low distor on. In the LT812SUB the high-excursion woofer,
together with carefully tuned vented cabinet, off ers an extended response with deep and ght basses.
The extremely lightweight power module used in the LT812SUB feature the latest technologies for amplifi ca on, such
as Switch Mode Power Supply (SMPS), CLASS D output stage for the low and CLASS AB for the mid-high, which provides
a massive amount of power with a reduced weight. The power module is hosted in fully-sealed box that provides
protec on, perfect insula on of the cabinet from the outside and extremely effi
cient cooling. The module includes a
sophis cated pre-amp sec on with up to 24 dB/oct. phase aligned crossover fi lters and EQ for the system’s fi ne tuning.
The DUAL LIMITER circuit ensures an undistorted sound even at the loudest level and a total loudspeaker protec on.
INSTRUCTIONS (FIG. 1 / 2 / 3)
1. LEFT INPUT (combo XLR-JACK input)
This is a female combo connector, which accepts a XLR or a JACK plug from almost any type of equipment with a
balanced or unbalanced outputs. The XLR input is wired as follows:
Pin 1 = shield or ground
Pin 2 = + posi ve or "hot"
Pin 3 = - nega ve or "cold"
The JACK input is wired as follows:
Tip = + posi ve or "hot"
Ring = - nega ve or "cold"
Sleeve = shield or ground
When connec ng an unbalanced signal, wire them as follows:
Pin2 / Tip = + posi ve or "hot"
Pin 1-3 / Sleeve = shield or ground
NOTE: whenever possible, use always balanced cables. Unbalanced lines may also be used but may result in noise over
long cable runs. In any case, avoid using a balanced cable for one channel and an unbalanced one for the other.
2. LEFT LINK (XLR output)
This is a male XLR connector, it is connected in parallel with the respec ve LEFT INPUT socket, so the LINK is wired as
INPUT. Connect these to the inputs of other powered speakers to make an array.
3. RIGHT INPUT (combo XLR-JACK input)
This is a female combo connector, which accepts a XLR or a JACK plug from almost any type of equipment with a
balanced or unbalanced outputs. The RIGHT INPUT is wired as LEFT INPUT.
4. RIGHT LINK (XLR output)
This is a male XLR connector, it is connected in parallel with the respec ve RIGHT INPUT socket, so the LINK is wired as
INPUT. Connect these to the inputs of other powered speakers to make an array.
5. GND LIFT switch
This switch li the ground of the balanced audio inputs from the earth-ground of the amplifi er. If you have HUM noise
problem on one or more loudspeaker try to change the posi on of these switches (o en all up or all down for all the
amplifi ers in the system). Please note that to have an eff ect all cables must be balanced.
6. SUB LEVEL control
Rotary level control: it a enuates the level of the signal sent to the SUBWOOFER. The a enua on ranges from “0” fully
closed (the signal is completely a enuated) to “10” fully open. Set it considering the ambient acous c and the music
genre.