Dynacord A 118A [8/24] Power amplifier and cooling
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Dynacord A 118A [8/24] Power amplifier and cooling

Dynacord A 118A [8/24] Power amplifier and cooling
A 112A | A 115A | A 118A
8
MIX
The post-fader audio signals of INPUT 1 (LINE 1 and AUX)
and INPUT 2 are mixed and passed to LINK OUTPUT (see
illustration 2-2). The ratio of the input signals changes
when the level controls INPUT 1 and INPUT 2 are turned.
MIX allows the loudspeaker to act as a basic two-channel
mixer that can send the mix to another loudspeaker via the
LINK OUTPUT connector.
11 S
PEAKER MODE SELECTION SWITCH (MAIN/MONITOR)
Select MONITOR to activate optimized sig-
nal processing for floor monitoring appli-
cations. MAIN works best for music
playback and applications that require enhanced bass and
treble.
12 S
ELECTION SWITCH FOR MAIN MODE (FULL RANGE/LO-
CUT)
If the speaker is used as a full-range sys-
tem, select FULL RANGE. If a subwoofer
without a low-cut signal output is used,
i.e. the identical audio signal is used for
the A 112A/A 115A and the subwoofer,
select LO-CUT for activating the internal 100 Hz low-cut fil-
ter of the A 112A/A 115A. If the A 112A/A 115A is connect-
ed to the HI-OUT output of a subwoofer with integrated
low-cut filter, select FULL RANGE to avoid having the two
low-cut filters of the subwoofer and A 112A/A 115A in se-
ries.
The setting LO-CUT can also be used for delay applica-
tions, when a high bass level is not necessary.
13 INPUT 1
LEVEL CONTROL (LEVEL)
Level control for adjusting the amplification
of the signal at the LINE 1 and AUX L/R input.
14 INPUT 2
LEVEL CONTROL (LEVEL)
Level control for adjusting the amplification
of the signal at the INPUT 2 input.
2.2 Power Amplifier and Cooling
This is a powered loudspeaker with a very high efficient
amplifier module and as a result does not overheat. The
temperature of the amplifier module is monitored. In the
rare event it does get too hot, it will automatically shut
down to protect itself. Once the temperature has returned
to within the operating range, the amplifier will turn back
on. This may happen when the speaker is operated in very
high ambient temperatures and the enclosure is exposed
to direct sunlight. Always ensure adequate cooling and ap-
propriate shade to keep the ambient temperature around
the speaker within the specified operating temperature
range.
CAUTION: The rear panel of the amplifier module
serves as a heat sink for the power ampli-
fier. Certain parts may be hot during opera-
tion.
2.3 Quickstart
This section outlines setup and operation of two A 112A
connected to a DYNACORD CMS mixer.
CAUTION: After system installation is complete, power
on the mixing console first and position the
master faders at the lowest setting before
powering on the A 112A. Use the output fad-
ers to establish the desired volume setting.
Otherwise, switching and power-on noise or
the high level audio signal of an inadver-
tently playing audio source could result in
high acoustic outputs, which in some cases
might lead to hearing damage.
1. Place the A 112A, mounted on pole-mount stands to
the left and to the right. The lower edges of the
speaker systems should be approximately at a height
of 1.8 meters to provide sufficient coverage and to
prevent that listeners nearby are subject to extreme
sound levels.
2. Using suitable XLR-type cables connect the Master
Outputs of your mixing console, e.g. DYNACORD
CMS 1000, to LINE 1 of the left or right A 112A. Posi-
tion the master faders on the mixer to the minimum
setting. Now, turn on the mixer.
3. Connect the A 112A to the mains outlet using the
supplied mains cord. Plug the connector into the
MAINS IN socket. Use the POWER switch to power-up
the A 112A.
4. Set the LEVEL and VOLUME controls of the A 112A to
0dB.
5. Select FULL RANGE and MAIN to operate the speak-
ers as a main PA system.
6. Connect a audio source, e.g. CD player, to a line level
input of the mixer, e.g. CMS 1000. Set all rotary con-
Illustration 2-2: Signal flow MIX

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