Behringer EX2200 - Manual (Page 14)

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DUALFEX PRO EX2200
3.3.2 Phase Shifting
The term phase shift describes the displacement of a signal’s phase in relation to its point of origin. As a matter
of principle, the phase shift produces a delay within the signal.
If the delayed signal is added to the original signal, the resultant signal becomes “wider”. Below time delay
values of 20 msec. the brain perceives the delayed arrival of the two signals as the arrival of one signal, which
results in the desired “pulse enlargement” effect, sometimes called “3-D” effect by other manufacturers.
The effect produced by so-called “chorus” units is based on the same principle of phase shift and signal delay.
Here, several delayed signals are added to evenly intensify this effect.
The BEHRINGER DUALFEX PRO is equipped with a frequency-selective phase shift circuit that comprises
several stages. Due to the program-dependent delayed signal, the sonic impression becomes more vivid, as
with an orchestra, where the musical liveliness is the result of inaccurate “entries” by musicians.
3.3.3 Generating Artificial Harmonics
By 1955 an American, Charles D. Lindridge, had already invented the first “EXCITER” (a unit that EXCITES
upper harmonics), when he presented a unit for “improving the sound of music and speech”. He enriched signal
sources with artificially generated upper harmonics and found that both sound quality, transparency and
perceived positioning of musical instruments could be considerably improved using this effect. He was granted
an American patent on his circuit design under the number US 2 866 849.
Compared to modern technology, Lindridge’s circuit was anything but fully developed, however, it featured
many of the aspects found in today’s modern circuit designs.
Psycho-acoustic discoveries and greater knowledge, gathered over the years, have allowed for new and
improved circuit designs applying advanced technology.
3.4 The Bass Processor of the DUALFEX PRO
Apart from processing the upper harmonic ranges, users of the BEHRINGER DUALFEX PRO have access to
an innovative bass processor.
The numerous stages of processing during the recording, reproduction, copying and effecting processes,
increasingly delay the phase of the bass frequencies, when compared to the remaining frequency ranges. This
is why the low-frequency range suffers from a loss in power and fundamental bass definition.
With the help of frequency-selective phase shift combined with sub-bass boost, the bass processor of the
BEHRINGER DUALFEX PRO is capable of compensating for this loss, giving the program material new bass
presence. Using the MODE switch, you can select between two different bass sounds.
Be extremely careful when using the bass processor: excessive use of the bass processor might lead to
speaker damage. The amplified sub-bass frequencies may well place a heavy load on the amplifier and the
woofers. Therefore, carefully adjust the bass processor and observe the power rating of your system!
3.5 The Surround Processor of the DUALFEX PRO
Sound quality during signal transmission is given top priority today. The signal is processed with the help of
reverb devices, compressors, exciters, denoisers and other studio devices to produce a compact, low-noise
and transparent sound.
However, the fact that hearing impression depends largely upon the positioning of the instruments within the
stereo panorama is often enough neglected. Using the surround processor of the DUALFEX PRO, the intensity
of the stereo effect can be dramatically improved. The program material gains in liveliness, loudness and
transparency. As in a cinema with its special acoustics, the listener has the impression that the orchestral
instruments are placed all around him. The surround processor enlarges the stereo basis dependent on the
program material, without audibly colouring the sonic image.
The function of the surround processor is based on the derivation of a special signal, which is generated from
the difference of the left an right channel. This signal is then delayed program dependently and mixed with the
original signal. The difference between the two channels is the “stereo substance” whose ambient and spatial
information is improved by delaying the signal. Due to the described function, the surround processor is
principally useful only with stereo program material.
3. TECHNICAL BACKGROUND