Manual del Usuario
/ D series amplifiers/
User’s Manual
8: PRC switches: Each channel of the amplifier may be
power limited independently using these pairs of switches
in three stages, offering 2, 4 and 6dB of Power Reduction
Control. The settings for these switches are on the rear
panel for quick reference.
9: Link switch: Press this switch to link the input of the channel to its immediate left. Multiple channels may
be linked using these switches so, for example, to link all outputs to input A, press all three switches IN and
use input A only. The front panel attenuators will still operate independently when channels are linked.
CONNECTIONS
INPUTS
The inputs are made via 3-pin XLR connectors, which are electronically balanced and should be
connected via a high grade twin core screened cable, as follows:
PIN2 - Hot (). Signal Hot.
PIN3 - Cold (signal -). Signal Cold.
PIN1 - Screen (see note).
Connected to the chassis of the unbalanced equipment
or left disconnected at the unbalanced end.
The amplifier is designed to operate with fully balanced equipment and ground loops or loss of
performance may be experienced if connected to unbalanced sources.
NOTE: This amplifier is wired to the latest industry recommendations. PIN1 is connected directly to the
chassis/mains earth. If ground loops (mains hum) are encountered remove the screen connection
from the other end of the cable and leave it open circuit. If problems persist, consult your dealer/
supplier, DO NOT TAMPER WITH OR ALTER ANY GROUND (EARTH) CONNECTIONS
INSIDE THE AMPLIFIER.
D-10
&
D-20
: For bridged operation input should be made to channel A only and the rear panel switch
set for bridged mode. Channel B will then be fed out of phase with channel A.
D-100
: For bridged operation input should be made to channel A (or C) only and the rear panel switch
set for bridged mode for the appropriate pair of channels.
OUTPUTS
The speaker outputs are via Neutrik Speakon connectors. Only 2 of the 4 poles are used. 2 pole (NL2FC)
or 4 pole (NL4FC) connectors can be used. Terminations are as follows :
HOT
Pin +1
COLD Pin -1
Additionally Channel A Speakon connector carries Channel B output on Pins +2 & -2 to allow easy bi-
amping or bridged operation.
HOT
Pin
+2
COLD Pin
-2
NOTE: 1.- Although the "cold" output terminals are nominally at 0V., they should not be joined together,
otherwise cross-talk may be introduced.
2.- Because the currents involved are very high, the speaker cables should conform to the following
minimum requirements, otherwise the losses will cause the cables to get hot and audio power will
be reduced:
D-10
, 12A
D-20
, 16A
D-100
, 20A
- all into 4ohm speaker loads
NOTE: Do not connect the inputs/outputs to any other voltage source such as a battery, mains source or
power supply, regardless of whether the amplifier is turned on or off.
Do not run the output of any amplifier channel back into another channel's input and do not
parallel or series-connect an amplifier output with any other amplifier output.
LINK SOCKET (only
D-10
&
D-20
)
Each channel is provided with a 3-pin XLR connector marked 'LINK' which allows the input signal to be
linked to further amplifiers etc. The connections are the same as for the input XLR.
BRIDGED (MONO) OPERATION
Use centre Speakon connector marked 'BRIDGED' and connect as follows:
HOT
Pin +1 (Channel A - IN PHASE)
COLD
Pin -1 (Channel B - OUT OF PHASE)
When operating in bridged mode, the minimum impedances are doubled. The minimum load in bridged
mode is:
D-10
: 4 ohms,
D-20
: 4 ohms,
D-100
: 4 ohms.
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