Nexo Alpha System - Manual (Page 14)

α α α
P 14
USER MANUAL
VERSION :1.01
DATE : 06/10/10
down to 40Hz).
On the contrary, if the system includes Alpha S2 sub-bass cabinets, and the required SPL level in
the LF region is important, it is then recommended to switch to the “X-Over” mode.
It is also possible to overlap the S2 and B1 responses by switching the AlphaTDcontroller to
“Wideband” mode : the radiated energy will increase in the 40 Hz – 80 Hz range, but the Alpha
B1 power capability will decrease.
2.3.3. A LPHA ETD CONTROLLER ( FOR USE WITH A LPHA E S ERIES )
The AlphaETDcontroller LF output is a low-pass filtered monophonic sum of the stereo inputs ;
MF/HF outputs are stereophonic.
The only available front panel adjustment is the LF output level, on a 12 dB range :
• LF mono , 1 AlphaETDcontroller, 2 inputs connected : the recommended position is “2” ;
• LF stereo, 2 AlphaETDcontrollers with 1 input connected : the recommended position is “1”.
The cross-over frequency between Alpha B1-18 and EM being located around 200 Hz, a
monophonic use of the LF range induces random phase relation between cabinets (image
distorsion, inaccurate low-mid frequency reproduction) ; therefore, except for some specific
situation (stadium PA systems, annoucements…), Nexo do not recommend monophonic use of
the LF range.
2.3.4. NX241 D IGITAL TD CONTROLLER
The digital NEXO NX241 controller is able to drive the entire current Nexo range (PS & Alpha
series). Different software setups are loaded for the Alpha Series :
• Alpha B1-18 / EM / EF : NEXO NX241 is stereo in configuration (2 inputs, 4 outputs).
• Alpha S2 / B1-15 / M3 & M8, Full Range Mode : NEXO NX241 is in mono configuration (1
input, 4 outputs)
• Alpha S2 / B1-15 / M3 & M8, Aux Sub Mode : NEXO NX241 is in mono configuration, “Aux
Sub” input drives output “1”, “Full Range” input drives outputs 2, 3 and 4 ;
• Other setups are loaded, please refer to the NEXO NX241 user manual in order to avoid
inappropriate configurations that could damage your speakers.
Very important :
Due to the DSP processing time, there is no compability between analog SubTD / AlphaTD /
AlphaETD controllers and Digital NX241 unless the signal feeding the analog devices is delayed
by 1.4 ms.