Nexo NXAMP - Manuel (Page 13)

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13
BLOCK DIAGRAM DESCRIPTION
Block diagram description
Equalisation & Filtering
The number between parenthesis refers to the number circled in the block diagram.
Subsonic and VHF filtering (1)
Low and high-pass filters are used to filter out frequency components that could possibly degrade the
performance of the TDcontroller and amplifiers. The filters are optimised to work in conjunction with
overall system response.
The high pass filters are also extremely important as they optimise excursion at very low frequency which
is a very important safety factor. (Therefore do not use set-ups which are not designed for the cabinet
you are using).
Equalising wideband acoustical response (2)
This wideband equaliser section achieves the correction required to obtain a flat system response, as the
cabinets are acoustically designed for maximum efficiency on the whole frequency range. Active rather
than passive attenuation allows the lowering of amplifier voltages for a given output SPL and therefore
increases the maximum SPL achievable with the same amplifier.
Active equalisation also extends system bandpass especially at low frequencies where acoustical
performance is limited by cabinet size.
Equalising single component response (3)
This equaliser set allows acting on a specific driver after the crossover, rather than the on wideband
section. This allows to EQ one driver without affecting the others (cleaning out of band response, fine
tuning in a crossover…). All the parameters are factory set.
Crossover section (4)
Crossover between different bands is tuned for every set-up of every cabinet. Each crossover is
customized so that each transducer will fit with its neighbour by achieving a perfect phase alignment.
Unconventional, crossover-defined filters are applied, ranging from 6dB/octave to near infinite slopes
according to the type of crossover desired. Time alignment is also unconventionally achieved, by
combining crossover filter group delays with allpass and/or frequency dependent delays.
User set-up, Array EQ (5)
A basic Array EQ is currently implemented in the NX242. The cut off frequency of a low-shelving filter is
factory tuned for each cabinet set-up. The user has access to the gain of this filter. The array EQ is tuned
in order to reproduce the effect of the bass coupling, allowing the user to increase or diminish the effect of
the stacking.
USER MANUAL LOAD2_22
DATE: 03/12/2004