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ACN 2C, ACN 2S and ACN 3C

Lab Gruppen


Features

- ACN 2C: 2-way stereo or 3-way mono
-
ACN 2S: 2-way stereo or 3-way mono

for sub-frequencies

ACN 3C: 3-way stereo or 4- and 5-way mono
Switchable crossover frequencies:
 

ACN 2C: 16 frequencies between 80 Hz and 1.4 kHz
ACN 2S:
16 frequencies between 40 Hz and 165 Hz
ACN 3C:
32 frequencies between 80 Hz and 4.8 kHz

No dangerous "x10 switches" or frequency knobs on the front
The standard slope is 24 dB/octave. Optional: 12 and 18 dB/octave slopes.
Switchable subsonic filters
Front panel gain controls
Mute switch on all outputs
Mono bass switch
Electronically balanced inputs with transformer option

In an active loudspeaker system the crossover network is connected, in the signal path, before the power amplifiers. An active crossover network feeds separate signals to the bass, mid, and treble power amplifiers. The power amplifiers in turn power the corresponding loudspeaker drivers for the bass, mid, and treble ranges.

This method has several advantages, especially in large PA systems, compared to passive dividing where the crossover network is connected between the power amplifiers and the loudspeakers. You get for example lower distortion, in particular distortion that is caused by loud bass tones which intermodulate with the mid, and treble ranges. An active system also eliminates the power losses, associated with passive crossover networks.


LAB.GRUPPEN's ACN C crossovers are designed around a four-pole state variable filters, which are derived from the theory of analog computers. The most common way to alter crossover frequencies in such a circuit is to turn a multiple ganged potentiometer. However most potentiometers have bad tolerances (20 % or worse), and these tolerances affect the accuracy of the crossover frequencies and the flatness of the summed output.

A better way of altering the crossover frequency is applied in the ACN 2/3C; namely the use of "Digital Hexcode" switches. This allows the use of close tolerance components, which result in a crossover frequency accuracy better than 1 %.

By careful selection of these components, an optimum density of available crossover frequencies has been created, especially in the region between 800 Hz and 2 kHz. This has made it possible to achieve a continuity of phase and of group delay time together with the speaker system. This leads in turn to an improved intelligibility in the vocal region.


12, or 18 dB/octave slopes can be ordered as an option. The 24/octave slope has equal phase at the crossover frequency region, in accordance with Linkwitz-Riley. To achieve flatness in the summed output, the high and lowpass filters meet each other at 6 dB.


Each of the outputs of the ACN 2/3C have been equipped with shelving equalization, which gives an adjustable bass boost of upto +12 dB, and a treble boost of upto +12 dB. In the ACN 3C the mid output has an additional shelving boost, but that works at a lower corner frequency. With the help of this equalization it is possible to align the frequency response of the speaker system. You can, for example, compensate the roll-off in the treble of so-called "Constant Directivity"-type horns. It also means you negate the need, for an external (graphic) equalizer, in several applications.

 

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