Serie H /
H series
Manual del usuario /
User's manual
12
BACK PANEL DESCRIPTION
A) OUTPUT CONNECTIONS
For connection of channel outputs to speakers, both binding
posts and Speakon NL4 connections are provided.
For the binding posts, polarity is clearly indicated by black (–)
and red (+) output terminals.
For the Speakon situated on the right, pin assignments are:
Channel A : +1 / -1
Channel B : +2 / -2
Bridge : +1 / +2
For the Speakon situated on the left, pin assignments are:
Channel B : +1 / -1
Thus you may choose to connect both channels using only
one or the two Speakon connectors, depending on your needs.
B) INPUTS
An XLR input is connected in parallel to an XLR output.
Nominal input impedance is 20k ohm for balanced use and
10k ohm for unbalanced use.
Polarity complies with AES14-1992 (ANSI S4.48-1992) and
therefore pin assignments are:
1 = GND (Ground)
2 = (+) non-inverted signal
3 = (–) inverted signal
C) INPUT MODE
This switch allows the selection for the input configuration
mode: stereo, parallel or bridge.
Typically the amplifiers are used in stereo mode, where the
input to channel A feeds channel A and the input to channel B
feeds channel B.
Parallel mode allows feeding both channels with the signal
plugged into channel A. Channel B's input is disconnected in
this mode.
Bridge mode allows easy wiring of an amplifier in mono mode.
The input to channel A feeds both channels with appropriate
polarity. Refer to the “Bridge Mode Operation” Appendix for
further information.
D) MAINS LEAD
The mains lead is terminated on a plug that will change
according to the amplifier’s mains voltage and area location.
If you need to cut off the plug to replace it for the type used in
your region, cable colour codes are brown (live), blue (neutral)
and yellow-green (earth).
E) FAN INLET GRILLES
Like for the front outlet grilles, keep clean and dust-free to
assure free air intake for proper cooling.
INSTALLATION
Racking
All amplifiers are 2U DIN high (except for H-4000, 3U),
standard 19-inch rack mount width.
Four front-panel mounting holes are provided for use with M5
or M6 or 1/4” screws. To avoid bending of the chassis in rack
mounting applications where the rack will be transported,
mount the amplifiers to the back of the rack using the rear
mounting holes. Alternatively, place the bottom amplifier
against the base of the rack and pile the amplifiers with no
clearance in between.
Amplifiers’ dimensions can be found on the “Line Drawings”
section of this manual.
Cooling
A fan cools the aluminium heat sinks and transformer from
back to front.
When mounting the unit onto a 19-inch rack, a rack cooling
system is not required, since the air is exhausted out through
the front grille. However, the rack must not be sealed, and it
should at least have a large enough ventilation grille to allow
air into the rack.
The fan speed is variable.
Input cable connections
The Input Cabling Appendix shows balanced and unbalanced
connection from different types of connector to the amplifiers.
Speaker cable connections
Either the binding posts or the Speakon connectors can be
used.
Switch off the amplifier and unplug the unit from the socket
before making any connections.
The binding posts can be used with bare wire or banana
connectors. In either case, ensure that you remove the
required length of cable sleeve that allows for the conductor
itself to be hidden. Always note polarity (red=+, black=–).
