Behringer CX3400 - Manual (Page 18)

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The limiter threshold can be set from -6 dB to OFF and acts on all six limiters at the same time. Still, each
limiter band works independently, with the LIM-LEDs lighting up as soon as the associated limiter is activated.
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Please note that the limiters in the SUPER-X PRO are no „hard ratio“ limiters, i.e. signal peaks
can surpass the adjusted threshold by as much as 6 dB. Please make sure that your system
provides enough headroom.
3.6.1 Limiter setup
On condition that you are using power amps and speakers that are compatible in terms of power rating, you
should drive your amps under full load (i.e. 0 dB). Use pink noise from your analyzer as a sound source, turn
the limiter THRESHOLD control to maximum and press the LIMITER button. Then, gradually cut back the
threshold until just a few LIM-LEDs start flashing. Now, the entire system gain is limited to 0 dB.
3.7 LOW SUM function
To produce a very loud and deep bass response, the lowest band should be summed in a mono signal, while
the remaining bands remain in stereo (the human ear cannot locate the source of low frequencies). By
combining all woofer cabinets in one single cluster (the closer, the better) you can optimize their efficiency.
Two woofer cabinets positioned next to each other produce an SPL that is 3 dB higher than that of two
cabinets placed at a certain distance. Four cabinet give you as much as 6 dB, because low-frequency sound
waves feature a spherical dispersion pattern. When the cabinets are positioned separately, the sound waves
they radiate interfere with each other, while cabinets placed next to each other create one common wave
front (compare two stones that are thrown into the water, either separately or together).
In stereo mode, the SUPER-X PRO can be switched to mono bass mode using the LOW SUM button.
When the LOW SUM button is pressed, the low-frequency signal portions in the left and right channels are
summed up. The output signal is routed to the Low output of channel 1, from where it can be used to drive, for
instance, a sub-woofer cabinet.
3.8 CD HORN function
When a driver radiates into open space via a horn, its efficiency increases. Over the past few years, so-
called constant-directivity horns have gained widespread popularity, as they offer the advantage of producing
a very regular dispersion pattern over their frequency range; however, the higher the frequency, the lower
their efficiency. To make up for this drawback, the SUPER-X PRO includes a switchable pre-EQ for CD
horns that ensures a flat frequency response even before equalization is applied. This pre-EQ raises the
signal gain by 3 dB at 3.5 kHz, which then increases by 6 dB/oct. up to 22.5 kHz.
4. INSTALLATION
Your SUPER-X PRO CX3400 was carefully packed in the factory and the packaging was designed to protect
the unit from rough handling. Nevertheless, we recommend that you carefully examine the packaging and its
contents for any signs of physical damage, which may have occurred in transit.
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If the unit is damaged, please do not return it to us, but notify your dealer and the shipping
company immediately, otherwise claims for damage or replacement may not be granted. Shipping
claims must be made by the consignee.
4.1 Rack mounting
The BEHRINGER SUPER-X PRO fits into one standard 19" rack unit of space (1 HU). Please allow at least an
additional 4" depth for the connectors on the back panel.
Be sure that there is enough air space around the unit for cooling and please do not place the CX3400 on
high-temperature devices such as power amps, etc. to avoid overheating.
4. INSTALLATION