Z-Systems z-K6 K-Surround Processor - Manual (Page 7)

z-K6 manual
7
From the LRC ambience screen press the "to LRS page" button to get to the surround page.
Subsequently, pressing the system button will return you to this page. This page contains two
parameters: the rear K-level and the LFE cut frequency, as shown in Figure 5. The rear K-level
controls the amount of ambience extracted to the rear channels. The LFE cut controls the cutoff
frequency of the filter in the LFE signal path.
The rear-channel ambience merits a more in-depth discussion. If you listen to the rear channels
by themselves, you will notice that they probably don't sound like what you would expect. This is
because our surround extraction technique actually depends on the rear channels being played in
tandem with the front channels. There is a psychoacoustic "fusion" that occurs when the front
and rear channels are experienced simultaneously. When you have dialed in the appropriate
amount of rear K-level and set the rear channel offsets to the correct values, you will hear a
tremendous soundstage, with an image that wraps around you. Furthermore, the timbral
character of the music will not change appreciably, resulting in a very natural surround experience
that is comparable to having heard the source material in a real acoustic space. The character of
this space can be altered by manipulating the rear K-level and the rear EQ.
Controlling Front Ambience Equalization
Push the EQ/Master Level, offsets button until the screen in Figure 7 appears. You will see
parameters for five filters:
1) Input high shelf
2) Input low shelf
3) Ambience high-pass
4) Ambience low-pass
5) Ambience bell
The input high and low shelving filters are applied to the input signal and affect the shelving of
both the input and the enhanced frontal ambience. The high-pass, low-pass, and bell filters are
applied to the enhanced frontal ambience only. These three filters are used to change the spectral
character of the frontal ambience. The shelving filters have variable corner frequencies and shelf
gains. The bell filter is fully parametric, with controls for gain, bandwidth, and center frequency.
The high- and low-pass filters can be turned off; the full counter-clockwise position for the high-
pass filter is its off position and the full clockwise position for the low-pass filter is its off position.
Figure 7 - Front ambience equalization page