Warnings; Pre-Amp Connection; Operation Mode - Amate Audio HD Serie Manual De Usuario

7. Warnings

CAUTION high risk of malfunction or mayor damage!
As specified in the previous point, there is the posibility to have both
channel outputs (A and B) through the SPEAKON A, this function is very
useful when using the amplifier in BRIDGE mode, this is posible because
the SPEAKON A uses all the pins (+1 -1 belong to channel A and +2 -2
to channel B).
BE CAREFUL WHEN USING THIS KIND OF CONNECTION, A
SHORTCIRCUIT BETWEEN THE POSSITIVE PINS (+1 +2) CAN DAM-
AGE THE AMPLIFIER OR EVEN THE DESTRUCTUTION OF ONE, OR
BOTH, POWER MODULES THIS IS BECAUSE A SHORTCIRCUIT BE-
TWEEN POSITIVE PINS MAKES ONE CHANNEL WORKS AGAINST
THE OTHER

8. Pre-amp connection

The input (BALANCED INPUTS) enables connection through XLR-3
connectors. The amplifiers incorporate balanced input for a high re-
jection of noise generated by long signal cables, proximity to electric
wires or sources causing them.
BALANCED Inputs: 1. Shield 2.(+) Live 3. (–) Return
UNBALANCED Inputs: 1. Not connected (* See Note)
2. (+) Live
3. Ground
(*) NOTE: This amplifier follows the ground interconnection specification
defined by AES48-2005 standard of the Audio Engineering Society, on
grounding and EMC practices for audio equipment containing active cir-
cuitry.
For that reason, when a source with unbalanced outputs should be connect-
ed, it is recommended not to use Pin1 of the XLR, and never connect it to
9. Operation modes
Stereo
In Stereo mode, each one of the amplifier channels
works independently from the other.
Parallel
In this mode, the signal inserted at CHA input will be
routed to both channel's power modules (CHA and
CHB), ignoring the signal at CHB input. This option is
useful when a series of speakers must be fed with the
same signal, because the signal can be routed saving ex-
tra cable connections between inputs.
Bridge (Mono)
In this position both channels are used as a single ampli-
fier, capable of delivering the double of the power. In this
operational mode the input signal must be fed through
CHA input connector. At the output, connections must
be made as following:
All manuals and user guides at all-guides.com
Load Capacity: The HD amplifiers have a sufficient current capacity
to admit very low loads (down to 2 Ω). It should be taken into account
that many loudspeakers using passive filters and whose nominal im-
pedance is of 8 Ω do in fact present impedance much lower than the
nominal one at certain frequencies. Therefore, it is advisable to use
2 Ω loads only when one is perfectly aware of the impedance curve
of the loudspeaker system to be connected. Otherwise, the amplifier
could cause cut-offs at the output due to the short circuit protection
(low impedance, <2 Ω) or over heating.
For lower nominal impedance connections (2 Ω STEREO/PARALLEL;
4 Ω BRIDGE) see section 13. Limiter adjustment.
Pin3. If a shielded cable is available, the shield may be connected to Pin1
of the XLR to get some shielding, leaving the other end unconnected. Pin1
connection is only advised if the equipment with the unbalanced output
has a dedicated connection for the shield, separate from the audio signal
ground reference.
located next to the input section (BALANCED INPUTS) is in the
STEREO position (down).
ALLEL position. The corresponding indicator located on the front
panel will light up (PARALLEL).
position. The corresponding indicator located on the front panel
will light up (BRIDGE).
To use Stereo Mode, make sure that the MODE selector,
Features:
* Independent input for each channel
* Independent volumen for each channel
* Independent limiter adjustment for each channel
* Independent anti-cliping system for each channel
To use Parallel Mode, place the MODE selector switch in PAR-
Features:
* One input for both channels (CH. A)
* Independent volumen for each output
* Independent limiter adjustment for each output
* Independent anti-cliping system for each ouput
To use Bridge Mode, place the MODE selector switch in Bridge
Features:
* One input (CHA)
* One volumen control(CHA)
* One limiter adjustment ( CHA)
* Anti clipping system (CHA or CHB)