Nexo Alpha System - Manual (Page 13)

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P 13
USER MANUAL
VERSION :1.01
DATE : 06/10/10
2.3. TD
CONTROLLERS SETTINGS
The Alpha Series speakers do not work properly without their associated TDcontrollers.
Sound quality, reliability are totally dependent on the proper use of the TDcontrollers, in
agreement with Nexo instructions.
• SubTDcontroller : Alpha S2 ;
• AlphaTDcontroller : Alpha B1-15, B1-18, M3 & M8 ;
• AlphaETDcontroller : B1-18, EM & EF ;
• NX241 Digital TDcontroller : all current Nexo speakers.
These device manuals must be read before set-up.
2.3.1. S UB TD CONTROLLER + S2 PARAMETER BOARD
The SubTDcontroller output is a monophonic low-pass filtered sum of Left and Right inputs ;
Therefore, stereophonic use of Alpha S2 requires 2 SubTDcontrollers.
Connecting one single input of the device will reduce signal output by 6 dB. Three different
solutions can be applied to compensate for this 6 dB loss :
• Increase the output level on the front panel potentiometer by 6 dB ;
• move the J4 jumper on the mother board to the “A” position (refer to SubTDcontroller manual) ;
• parallel the inputs with a “Y” split signal cable.
NB : the S2 parameter board disables the main system left an right XLR outputs, as well as the
Burst generator
Front panel phase switch and “Sub Delay” / “Sub Fine Delay” potentiometers are usefull to align
properly Alpha S2 phase relatively to Alpha B1. Below is what must be done depending on the
vertical alignement of the speakers :
S2 & B1 in the same vertical plane : phase Switch in “INV” position, « Sub Delay » potentiometer
at “0” position, , « Sub Fine Delay » rotated 3 steps to the right from the “0” position ;
S2 forward : phase Switch in “INV” position, « Sub Delay » and « Sub Fine Delay »
potentiometers adjusted to the average offset distance
S2 backward : : phase Switch in “INV” position, « Sub Delay » and « Sub Fine Delay »
potentiometers at “0” position.
2.3.2. A LPHA TD CONTROLLER
The AlphaTDcontrollers features the following adjustments :
• LF, MF & HF ouput level ( +/- 6 dB ) ;
• « Array EQ » potentiometer (see section III.2) ;
• « X-Over / Wideband » switch.
If the main system is to be used without Alpha S2 sub-bass cabinet, the AlphaTDcontroller must
be used in the “Wideband” mode : the B1-15 response is then extended down to 42 Hz (B1-18