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
Output Connector C
Pin 2+: Hot Ch.B
Pin 2+: Hot Ch.D
Pin 2-: Cold Ch. B
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).
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