NEXON PS8 User Manual download pdf (Page 53)

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8.5 TDcontroller REFERENCE GUIDE

8.5.1 Linear section

The characteristics of the linear section are independent of signal level, as opposed to the servo control

functions described in next paragraph.

Subsonic and VHF filtering

Low and high-pass filters are used to remove signals out of the usable frequency range, eliminating

sub- and ultra-sonic components that could possibly degrade the performance of the Controller and

amplifiers. These filters are optimized to realize the overall target system response.

Equalizing acoustical response

This equalization section provides the required correction to obtain a flat system response, as the

cabinets are acoustically designed for maximum efficiency in the whole frequency range. Active rather

than passive attenuation allows amplifier voltages to be lowering for a given output SPL and therefore

increases the maximum SPL achievable with the same amplifier.

Active equalization also extends system bandpass, especially at low frequencies where acoustical

performance is limited by cabinet size.

PS / Subbass Cross-Over

From input signals summed together, the resulting mono signal is low-pass filtered to feed the SubBass

channel. When the channel is turned on (Subbass On), main channels (Left & Right) high-pass filters

are reconfigured to filter out signal components below the crossover frequency. Slopes and other filter

characteristics are optimized using techniques optimized for the actual acoustical data of each driver.

8.5.2 Servo Control section

Servo control of the PS TDcontroller is intended to work with amplifier return signals present at the

Sense inputs (monitored by front panel LEDs).

VCAs and VCEQs

Each of the 3 Audio channels (Left, Right and SubBass) contains two voltage controlled elements

driven by servo signals:

• One operates on the whole frequency range (wide band VCA).

• The other elements work selectively as dynamic equalizers (LF-VCEQ & HF-VCEQ).

Depending on the nature and origin of the servo signals, either one or the 3 combined elements is used

to process the Audio signal. This feature allows more efficient processing while reducing audible effects.

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NEXON PS8 User Manual Page 53