LAB GRUPPEN ACN3C 3WAY STEREO-4 and 5WAY MONO CROSSOVER

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.

Key Features:

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

The VENU360 provides all the processing and flexibility you need between your mixer and amplifiers to optimize and protect your loudspeakers. With the latest advancements in dbxʼs proprietary AutoEQ and AFS algorithms, additional input channels, ethernet control via an Android, iOS, Mac, or Windows device, and updated wizards, the DriveRack VENU360 continues the DriveRack legacy of great-sounding, powerful, and affordable loudspeaker management processors, for a whole new generation.

The ARX EC-2 is a flexible yet affordable 24 dB per octave Phase Correct active crossovers.
It has 2 modes of operation; as either Stereo 2 way or a Mono 3 way units, with a switch on
the back panel selecting either mode.

Features
Ultra low noise circuitry
Totally phase aligned at crossover point
Switchable Dual Channel 2 way or Single Channel 3 way
Unique 'semi-fixed' crossover point
24dB per octave (Fourth Order) Linkwitz-Riley filters
Separate Summed Mono Output
Balanced Inputs and Outputs
Built in High Pass filters
Intuitive, 'user friendly' layout
Flawless performance in any audio environment

Tamper-Proof Crossover Points
The crossover points are determined internally by the value of 4 resistors per channel; changing
the resistor value changes the crossover point. This 'semi fixed' method avoids the pitfalls of
externally adjusted crossover points, making the crossover points tamper-proof once they are set.
Idle fingers can't fiddle with the crossover points and create havoc with the system!
As a handy guide, a list of common crossover points and their corresponding resistor values are
printed inside the unit's lid, and also set out in the Owner's Manual.
On the front panel are level controls for Low and High in dual channel 2 way mode, and Low, Mid
and High in single channel 3 way mode, with corresponding Outputs on the rear panel.

Balanced Inputs and Outputs
EC-2 has Balanced Inputs and Outputs, on XLR connectors.
The EC-2 also has an additional summed Mono Low output, for applications that need a Mono Low
feed (e.g. Left and Right full-range plus a single Sub Bass speaker).
High Pass Filter
There is also a preset 30 Hz HighPass filter to remove unwanted subsonics which can damage speakers
and waste amplifier power.
In addition, each output has up to +6 dB of gain available, to compensate for amplifiers and speakers of
differing sensitivities.
Universal AC Power
AC power range is a universal 100 to 120V or 220 to 240VAC, and is connected to the unit via a standard
IEC connector, with built-in fuse and voltage change switch.
Uncompromising Audio Quality
Innovative circuit design is pointless unless it delivers stunning sound quality, and here the EC-2 excels.
It has been designed for uncompromising audio quality, and to achieve this, Linkwitz Riley 24dB (Fourth
Order) state variable filters are used throughout, ensuring a smooth Phase Correct transition through the
crossover region.
From Stage Monitors to Studio Monitors, from Front of House to the Front room of your House, the ARX
EC-2 is a crossover that is suited to any application that requires flawless, transparent sound.
You'll never compromise on Quality when you choose ARX

T E C H N I C A L S P E C I F I C A T I O N S

Input Impedance Balanced 20 Kohms, Unbalanced 10 Kohms
Input Headroom + 21 dB
CMRR >45 dB, 20 Hz-20 KHz
Output Impedance Balanced 300 ohms, Unbalanced 150 ohms
Output Level (Max) + 21dB
Frequency Response 30Hz-20KHz +or- 0.5dB
Note: 30 Hz is a function of the High Pass filter
Signal to Noise ratio (Controls at Unity) -90 dB Unweighted, -93 dB 'A' weighted
Distortion 004% THD,0dB,1KHz
Dynamic Range 111 dB
Power Requirements 100/120 V AC, 220/240 V AC
Weight 5 lbs/2.2 Kg
Dimensions 19“W x 13/4“H x 6“D, 482 x 44 x 155mm
Input Connector type XLR
Output Connector type XLR
Crossover point frequencies are changed internally by varying the value of 4 resistors
per channel.

Front Panel Controls
Low and High Output controls for 2 way mode
Low, Mid and High Output controls for 3 way mode
Marker panels for labelling crossover assigns
2 way/ 3 way status LEDs
Rear Panel
Balanced XLR Inputs and Outputs
Additional summed mono Low output
2 way / 3 way mode switch

Providing 48-bit filter algorithms, 24-bit AD/DA conversion and a dynamic range of 115 dB, the DSP 244 sets new standards for digital loudspeaker controllers and processors. The DSP 244 is an universal Digital Sound System Processor that provides 2 inputs and 4 outputs; plus internal summing of the inputs 1 and 2. Via matrix it is possible to assign the outputs to any input or to the sum of the inputs. It is further possible to establish the following configurations: Stereo or Dual 2-Way systems, 3-Way + Direct and 4-Way systems, each with Mono Subchannel, but also full range systems. High and low-pass filters are provided for the frequency crossover functions in all operation modes. The selection includes Linkwitz-Riley, Butterworth and Bessel type filters with switchable slopes between 6, 12, 18 and 24 dB/oct. A huge number of additional filters offers extremely flexible correction of the frequency response. Each input incorporates a 5-band equalizer, allowing to assign high and low-pass, high and low-shelving or parametric peak-dip filters to its individual filter sections. Next to the frequency crossover filters, four additional filters are employed in each output channel, which also can be set to work as high or low-pass, high or low-shelving filters, parametric peak-dip filters, or all-pass filters. Additional filtering is provided through 2. order high-passes for the realization of B-6 alignment, or special LPN-filters (Low-Pass Notch filters) for correcting the frequency and phase responses of optimally vented woofer cabinets. Each channel additionally provides a delay, a polarity switch, a programmable level control and a digital compressor / limiter while the master delays are located in the input channels. Datasheets / ManualsBrochure (309KB)

Mains voltage 90 - 250 V AC / 50 - 60 Hz Power consumption 20 watts Safety class I Inputs 2 x XLR IN, electronically balanced, transformer optional available 2 x XLR OUT (Direct Out) Input voltage (nominal) 1.55 V / + 6 dBu Max. input voltage 24.5 V / + 30 dBu Input impedance 20 kohms Common mode rejection > 40 dB AD-conversion 24-bit, Sigma-Delta, 128 times oversampling, linear phase Outputs 4 x XLR OUT, electronically balanced Output voltage (nominal) 1.55 V / + 6 dBu Max. output voltage 8.7 V / + 21 dBu Output impedance

With the DSP 260 digital 2-in-6 sound system manager, DYNACORD is continuing its proud tradition in the fi eld of innovative digital signal processors.
Based on the most modern hardware, this system manager offers tried-and-tested as well as new algorithms for the simple and swift construction of active multi-way systems. As much importance has been attached here by the developers to high user-friendliness as to the realization of an extremely favorable price.
24-bit sigma-delta AD/DA converters and a 32-bit floating-point signal processor make possible a dynamic range of 111 dB. In addition to the two analog inputs, a digital stereo input in AES/EBU format is available. A -6 dB pad switch in front of the AD converters offers additional security against overload when the device is connected to mixing desks with very high output levels. The 6 individually mutable outputs are electronically balanced and available on XLR sockets. For all inputs and outputs, easily read LED level meters are provided on the front panel.
Users can choose whether to configure their own systems at the device itself using the controls and display provided or else by means of the intuitive editing software.
3-way stereo, 2-way stereo + FR, 4-way mono + FR etc. Furthermore, factory presets compatible with those of the tried-and-tested DSP-244 are available for Dynacord loudspeaker systems.
In terms of DSP, the device offers parametric and graphic EQs as well as a delay function in the input and crossover, channel EQ, channel delay and a level control with limiter in each output channel.
An RS-232 interface allows Master/Slave operation of multiple devices as well as GPI switching of settings. A PC (the editing software runs under Windows) can be connected via the USB interface on the front panel.
A variable parameter lockout function allows you to determine which settings and parameters can be accessed directly at the device. This is just one of many features that make the DSP 260 an ideal choice also for the rental business.
The wealth of features combined with its outstanding audio performance and favorable price commend this audio system manager for a multitude of professional applications.
General Mains Voltage 100-240 VAC 50-60 Hz Power Consumption 25W Audio Analog Inputs 2x XLR IN, electronically balanced, 2x XLR THRU OUT, electronically balanced Digital Inputs 1x XLR AES/EBU IN Nominal Input Voltage 1.23 V / +4 dBu Maximum Input Voltage (Without -6dB Analog Pad Engaged) 8.7 V / +21 dBu Input Impedance 10k ohm Common Mode Rejection -80 dB @ 1 kHz (typical) A/D Conversion 24-Bit Sigma-Delta Outputs 6x XLR OUT, electronically balanced Nominal Output Voltage 1.23 V / +4 dBu Maximum Output Voltage 8.7 V / +21 dBu Output Impedance 50 ohm D/A Conversion 24-Bit Sigma-Delta Frequency Response 10 Hz-22 kHz (+/- 0.5 dB) THD+N < 0.01% (band limited 22Hz-22kHz) Dynamic Range 111 dB unweighted, band limited 22 Hz - 22 kHz Interfaces USB USB Type B on front panel (PC Interface) 9-pin DSUB Software Confi gurable for GPI Preset Recall or Master/Slave Connection to second DSP 260 unit Signal Processing Sample Rate 48 kHz Data Format 24-Bit Internal Processing 32-Bit Floating Point Physical Dimensions (WxHx) 19 x 14 x 1.75 inches (482.6 x 355.6 x 44.45 mm) Weight (Net) 10.1 lb (4.6 kg) Weight (Gross) 13.0 lb (5.9 kg)