Manual del Usuario
/ D series amplifiers/
User’s Manual
Only
D-100
:
Additionally Channel A Speakon connector carries Channel B output on Pins +2 & -2 to allow easy bi-
amping or bridged operation using a single NL4 connector. Similarly, Channel C's Speakon connector also
carries Channel D output.
Output Connector A
Pin 2+: Hot Ch. B
Pin 2-: Cold Ch. B
Output Connector C
Pin 2+: Hot Ch. D
Pin 2-: Cold Ch. D
For bi-amped operation, connect as above.
There must be no shared connections between channels.
Negative output terminals must not be joined together as they are not both at ground potential.
Connecting them together will damage the amplifier and void the warranty!
As the currents involved are very high, and to ensure best performance, the speaker cables should be
kept as short as possible and conform to the following minimum requirements (
D-100
, 20A into 4 Ohm
speaker loads).
When operating the amplifier into loads of less than 4 Ohms, be aware that the current capacity of the
speaker cables will need to be increased above the values quoted here.
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.
Pairs of channels may be independently bridged – channel pair A&B, and/or channel pair C&D.
The method is the same for both channel pairs:
Supply signal to Channel A or C input only and push in the appropriate rear panel switch marked “BRG
A&B” or “BRG C&D”.
Use Channel A or C's Output Speakon connector and connect as follows:
Pin 2+: Hot
Pin 1-: Cold
When operating in bridged mode, the minimum impedances are doubled. The minimum load in bridged
mode is 4 ohms.
Changing the Gain of Your Amplifier: Internal Adjustments!
These instructions are for use by qualified personnel only. Before any routine maintenance, please
ensure that your amplifier is disconnected from the mains supply!
Gain/Sensitivity Settings (
D-100
)
Adjustment is by moving a link on the input PCB (PCB741) – one link for each channel. Channel
A's link is number 1, channel B's is number 2 and so on. The gain may be set to 26, 32 or 36dB
(factory setting).
Remember, setting higher gain does not change the maximum available power but changes the level of
signal input to achieve maximum power. In any case, provided that the input signal is less than 20dBu/7.7V,
the built in limiter circuit will prevent distortion within the amplifier.
The gain should be set to match the signal level from the source – mixer, equaliser etc.
Note: The gain of
D-10
is fixed to 32dB. The gain of
D-20
is 32dB (factory setting) or 36 dB by internal link.
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