LEM T4MA, Руководство пользователя, Страница: 7 / 16

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1. Introduction
Congratulations for having chosen the T4MA
loudspeaker system!
To make the best use of the system, please read this
manual thoroughly before operating the equipment.
2. Contents
3. Instructions for use and installation . . . 7
1. Protection and maintenance. . . . . . . . . . . . . . . . 7
2. Prevention of possible interference . . . . . . . . . . 7
3. Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Connector cables . . . . . . . . . . . . . . . . . . . . . . . . 7
4. The T4MA system . . . . . . . . . . . . . . . . . . 7
5. Installation and connections . . . . . . . . . 7
1. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2. Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6. DPPM module - Connection panel . . . . . 8
7. PRESETS . . . . . . . . . . . . . . . . . . . . . . . . . 8
8. The protection system . . . . . . . . . . . . . . 8
9. How the PLUGINS work . . . . . . . . . . . . . 9
10. Technical specifi cations . . . . . . . . . . . 10
3. Instructions for use and installation
1. Protection and maintenance.
To avoid jeopardizing correct operation, it is best not
to position the enclosures for long periods in exposed
places (damp, high temperature, etc.), in dusty
environments or those subject to strong vibrations. On
this subject, it’s advisable to always leave the protective
grille mounted on the enclosures. In the event of
breakdown, do not open the enclosure, but contact the
nearest GENERALMUSIC Service Centre.
2. Prevention of possible interference.
Avoid installing your equipment in the vicinity of
radios, televisions, etc., since this could cause noisy
disturbance. When connecting other equipment to
your sound system, pay close attention to so-called
earth-loops, which can cause hum: in the event of
interference, try using the
SHIELD switch on the unit’s
control panel.
3. Connections.
Before connecting the enclosures to the mains
supply, make certain that the current corresponds
with that indicated on the rear of the units (there is an
allowance of ±10%). Always connect the power cable
to the enclosures before switching them on and always
remove it after having switched off. Remember to
always connect or disconnect other equipment with the
enclosures off and to always switch on the mixer fi rst,
then the enclosures: in this manner, annoying and often
dangerous peaks are avoided.
4. Connector cables.
When connecting the enclosures to the mixer, make
certain to always use only screened signal cables
made up of two wires plus a braid/screen: the use
of unscreened cables could in fact probably cause
annoying hum and noise. Check periodically that your
cables are in good condition, correctly wired and with
perfectly effi cient contacts: in fact many problems and
drawbacks (false contacts, ground hum, crackles,
etc.) are caused by the use of unsuitable or damaged
cables.
4. The T4MA system (fi g. 1)
T4MA is a stage monitor that integrates in the same unit
loudspeakers , amplifi ers and digital processor . The
system, hosted in plywood cabinet, utilizes a coaxial
loudspeaker made of a 1” compression driver and
a 12” woofer. It’s powered by the
DPPM - Digitally
Processed Power Module , which includes a 50W
power amplifi er for the driver, a 250W power amplifi er
for the woofer and a digital processor able to handle
all the signal processing needed for the system control
(see
fi g. 2 ):
- HPF and LPF CROSSOVER fi lters with the choice
between Butterworth, Bessel or Linkwitz/Riley response
and up to 48 dB/oct. slope;
- up to 25
EQ fi lters that can be individually set as
FULL PARAMETRIC, HI and LO SHELVING (6 or 12 dB
slope) or NOTCH FILTER;
-
DELAY LINES on each for the LOUDSPEAKER
alignment;
-
PHASE adjustment with 5° step through a full 360°;
- integrated protection system with high precision PEAK
LIMITERS , long term power protection and LFC (Low
Frequency Control)
2 additional PLUGINS are also available, which allows
the system performances to be further increased:
NOISE GATE and ANTI-FEEDBACK .
The digital processor includes 16 PRESETS, which can
be recalled directly from the system’s panel and which
include different settings suitable for the use of the
system in different confi gurations.
5. Installation and connections
1. Installation (fi g. 3)
T4MA
is hosted in an asymmetrical cabinet that allows
the choice of two different set up angles when placed
on stage (35° and 55°), according to the distance of the
listener from the monitor.
When used together with the LEM T5SA sub-woofer
in DRUMFILL systems,
T4MA can be placed easily on
top of the sub choosing the best set up angle for the
drummer position.