Matching Of Gain And Input Load; Dip Switch Table - Lehmannaudio Black Cube Statement Manual

Matching of gain and input load

You can change input impedance (resistive loading) and gain by using the onboard DIP-
switches for each channel separately. These switches are accessible from the bottom of the
unit. Input capacitance is always 100pF. You may change the setting of the switches with
the Black Cube Statement connected to mains voltage and even to your stereo system ho-
wever in that case please first turn your volume knob to the minimum position because loud
pops could occur during switching.

DIP switch Table

Nr.
ON
OFF
The Black Cube Statement is highly flexible and also offers an insert point (R103, R203) for
inserting a resistor to accommodate cartridges which require special loading to be activated
by the switch and one additional hardwire slot for each channel for permanant installation
(R100, R200) with direct effectivity.
The impedance switches connect the impedance resistors in parallel to the 47k resistor. By
using the special impedance slots load options are unlimited. Soldering is not neccessary
Before you insert a custom load please do the following:
• Disconnect the power from the Black Cube Statement's power supply.
• Place the Black Cube Statement on a clean smooth surface.
• Carefully unscrew the four screws of the audio board's case with the tool included
with the Black Cube Statement or any other 2mm hex screwdriver
• After removing the top you can now insert your custom input load for each chan
nel. Do not use any tools that could damage the electronic circuit. Please use high
quality metal film resistors.
• The DIP switches are now accessible from the outside at the bottom of the unit
near the input RCA connectors. To activate your custom load you have to set the
switches no. 3 to the "on" position.
Use only high quality resistors for custom load impedances. Install these resistors only if
you know what you are doing. Otherwise please consult your dealer.
If all switches are in the OFF-position the input impedance is 47kOhms which is suitable for
most MM cartridges. The gain switch can be activated deparately so that MC/47k becomes
an option. This is recommended for some MC cartridges.
Please refer to your cartridge's information sheet for the recommended load. If you only
know the internal impedance of your cartridge you can use the rule that the load imnpe-
dance should not be less then 10x the internal impedance of the cartridge.
Both channel settings and impedances have to be identical!
gain
1
(MC)760µV
Gain = 61dB
(MM)7,6mV
Gain = 41dB
/ input load
2 3
1 kOhms free
(for custom load)
/ /
4
100R
/