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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 |
- 2 analog inputs and 6 analog outputs for maximum flexibility
- High-end 96 kHz converters for ultimate signal integrity and wide dynamic range (120 dB)
- Precise Dynamic EQs for level-dependent equalization and extremely musical Parametric EQs, selectable for all inputs and outputs
- Several types of EQs (LP/BP/HP) for each input and output
- “Zero“-attack Limiters on all output channels for optimal speaker protection
- Four different mono and stereo output operating modes
- Individual crossover filter types (Butterworth, Bessel and Linkwitz-Riley) with selectable roll-off characteristics from 6 to 48 dB/octave
- Adjustable Delays for all inputs and outputs—allow manual or automatic correction for room temperature, phase and arrival time differences
- 60 user-defined internal presets storable
- Servo-balanced, gold-plated XLR connectors for all inputs and outputs
- Internal switch-mode power supply for maximum flexibility (100 - 240 V~), noise-free audio, superior transient response plus low power consumption for energy saving
- High-quality components and exceptionally rugged construction ensure long life
- Conceived and designed by BEHRINGER Germany
| The LD Systems X223 is a stereo 2 way / mono 3 way crossover in standard 19"/1U rack format. Its rugged construction, high quality and robust knobs as well as the integrated power unit are rarities in this price range. It provides a mono sub output, an adjustable crossover frequency for each channel, adjustable LF/HF and input gains, phase reverse controls, switchable 40 Hz High-Pass filters and symmetrical XLR In- and Outputs. With the LD Systems X223 you get a crossover fulfilling the professional standards and offering great quality and sound characteristics.
Product type
Signal Processors
Version
2-way stereo/3-way mono
Frequency response
20 - 20.000 Hz
Signal-to-noise ratio
> 93 dB
Total Harmonic Distortion (THD)
< 0.004 %
Crosstalk
< - 80 (20 - 20.000 Hz) dB
Max. input level
+21 (balanced or unbalanced) dBu
Max. output level
+21 (balanced or unbalanced) dBu
Input impedance (kOhms)
50000 kOhm
Output impedance
200 Ohm(s)
Controls
2 x crossover frequency low/high, 2 x crossover low/mid, 2 x high gain, 2 x highpass (40 Hz), 2 x input gain, 2 x low gain, 2x frequency switch x1/x10, 4 x inv switch, LF sum, Mono/stereo mode
Indicators
2 x clip, 2 x crossover x 10, 2 x highpass, 4 x inv., mono, stereo
Line input connectors
XLR
Line output connectors
XLR
Mains connector
IEC socket
Operating voltage
220 V AC - 240 V AC
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The DX 4008 is a complete 4 input - 8 output digital loudspeaker management system designed for the touring or fixed sound installation markets.
The absolute latest in available technology is utilized with 32-bit (40-bit extended) floating point processor and high performance 24-bit Analog Converters. The high-bit DSP prevents noise and distortion induced by truncation errors of the commonly used 24-bit fixed-point devices. A complete set of parameters include I/O levels, delay,polarity, 6 bands of parametric EQ per channel, multiple crossover selections and full function limiters. The DX 4008 can be controlled or configured in real time on the panel or with the intuitive PC GUI accessed via the RS 232 interface. Software upgrade for CPU and DSP via PC keeps the device current with newly developed algorithms and function once available. Multiple setup storage and system security complete this professional package.
| Features |
|---|
| The DX 4008 is a complete 4 input - 8 output digital loudspeaker management system designed for the touring or fixed sound installation markets | | Sampling rate can be set to 96kHz | | Precise frequency control is achieved with its 1 Hz resolution | | Inputs and outputs can be routed in multiple configuration to meet any requirements | | The DX 4008 is shipped with a special PC Graphic User Interface (GUI) application - XLink | | XLink gives the user an option to control the DX 4008 unit from a remote PC via the RS232 serial communication link | | The GUI application makes much easier control and monitor the device, allowing the user to get the whole picture on one screen | | Programs can be recalled and stored from/to PC's hard drive, thus expanding the storage to become virtuality limitless |
| INPUT AND OUTPUT SECTION |
|---|
| Input Impendance: | >10 | kΩ | | Output Impendance: | 50 | Ω | | Maximum Level: | + 20 | dBu | | Type: | XLR 3 | Electronically balanced |
| AUDIO PERFORMANCE |
|---|
| Frequency Response: | +/- 0.1 | dB (20 to 20 kHz) | | Dynamic Range: | 115 | dB typ (unweighted) | | CMMR: | > 60 | dB (50 to 10 kHz) | | Crosstalk: | | dB | | Distortion: | 0.001% | (1 kHz @ 18 dBu) |
| DIGITAL AUDIO PERFORMANCE |
|---|
| Resolution: | 32 bit | (40-bit extended) | | Sampling Rate: | 48 / 96 | kHz | | A/D - D/A Converters: | 24 | bit | | Propagation Delay: | 3 | ms | | No. of Programs: | 30 | |
| FRONT PANEL CONTROL |
|---|
| Display: | 4 x 26 | Character Backlit LCD | | Buttons: | 12 Mute Controls 12 Gain / Manu Controls 6 Menu Controls | | | “DATA" control: | (dial encoder) | Embedded Thumb Wheel | | Level Meters: | 5 | segment LED | | Interface | RS 232 | Female DB-9 |
| LIMITERS |
|---|
| Threshold: | -20 to +20 | dBu | | Attack Time: | 0.3 to 100 | ms | | Release Time: | 2 to 32 | X the attack time |
| EQUALISATION |
|---|
| Type: | Parametric, Hi-shelf, Lo-shelf | 6 per I/O | | Gain: | in 0.25dB steps | -30 to +15dB | | Bandwidth: | (Q=0.5 to 72) | 0.02 to 2.50 octaves |
| CROSSOVER FILTERS |
|---|
| Filter Types: | Butterworth, Bessel, Linkwitz Riley | | | Slopes: | 6 to 24dB/oct (96kHz) | 6 to 48dB/oct (48kHz) |
| POWER REQUIREMENT |
|---|
| Operating voltage: | 220÷240 / 110÷120 ~ 50 / 60 | V ~ Hz | | Power (consumption): | | mA | | Fuse model: | | | | Operating temperature range: | 0 ÷ +55 | °C | | Operating humidity: | 20 ÷ 90 | % RH non-condensing |
| PHISICAL SPECIFICATION |
|---|
| Height: | 44 / 1.73 | mm/inch | | Width: | 483 / 19.01 | mm/inch | | Depth: | 203 / 7.99 | mm/inch | | Net Weight: | Kg/Lbs | 3 / 6.61 |
| SHIPPING INFORMATION |
|---|
| Package height: | 80 / 3.14 | mm/inch | | Package width: | 615 / 24.2 | mm/inch | | Package depth: | 360 / 14.17 | mm/inch | | Shipping Weight: | 4.3 / 9.4 | Kg/Lbs |
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Lab Gruppen NLB 60E
The NomadLink network provides remote monitoring, control and power sequencing functions for multiple C Series or FP+ amplifiers. Indeed up to 16 NLB 60E network bridges, each monitoring up to 60 amplifiers may be accommodated in one system. Easy setup, redundancy, and minimum maintenance were bywords when developing this network format.
NomadLink is a closed-loop, daisy-chained network topology with the NLB 60E providing the bridge to the familiar world of Ethernet/LAN. NomadLink reduces installation time and cost significantly, includes redundancy during operation by design and simplifies the location of faults or system abuse.
NomadLink together with the associated DeviceControl software allows the subnets’ architecture to be automatically uploaded even without individual IP addresses in the amplifiers. All in all, it is the fastest and easiest monitoring and control network on the market today.
Specifications:
Network Connectors:
* Nomadlink Out: EtherCon housed RJ45
* Nomadlink In: EtherCon housed RJ45
* Ethernet rear-panel: EtherCon housed RJ45
* Ethernet front-panel: Standard RJ45
General Purpose Inputs (GPI):
* One Voltage sensing input: Two pole Phoenix
* Two contact closure inptus: Two pole Phoenix
Front Panel Indicators:
* Front operation locked: Yellow LED
* Fault warning: Red LED
* Amplifier subnet muted: Red LED
* NomadLink network connected/activity: Blue LED
* Ethernet connected: Orange LED
* Ethernet Activity: Yellow LED
2 x 16 Character display: White text, Blue background
Navigation and Adjust keys: Yes, x 6
Subnet Power on/off keys: Yes, x 2
Power: 100 to 240 VAC, 50 to 60 Hz (auto-select)
Power consumption:
Finish: Anodized aluminum front, Plated and painted steel chassis
Approvals: CE, CSA
Dimensions (W x H x D): 19" x 1.73" x 8.2" (483 x 44 x 208 mm), 1 RU
Weight: 5 lbs. (2.25 kg)
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With 6 inputs and 4 outputs the dbx ZonePro? 640 and 641 provide flexible signal routing,
powerful DSP processing and multiple control interfaces for Commercial Audio applications.
Designed to offer superior system sonic performance and flexibility, the 640/641 deliver the
highest quality tools available. Even the input and outputs connectors were chosen for their
standard usage and reliability. The ZonePro products offer Euroblock connectors for balanced
signals and RCA connectors for interfacing with consumer equipment often used in commercial
applications; there is also a simple analog input buss that allows inputs to be sent from one
unit to the next for unit and job scalability. The 640 and 641 provide every necessary processing
tool, from the input processing like gain control and EQ available on all inputs to highly sophisticated
and specific functions such as selectable paging microphone processing including Gating,
De-Essing, Auto Gain Control, Compression and Feedback Suppression. The heart of the
ZonePro products is the Routing module that provides of course Primary Source Selection
but also Source Ducking for Paging and Priority Override. The outputs also offer a wealth of
processing designed for commercial applications like our patent-pending AutoWarmth? function
that was co-developed with JBL to provide natural low frequency extension at any signal level.
Each output also offers EQ, Bandpass and Crossover filters, Limiting and Delay for system
optimization. With the ZonePro? every tool is at your disposal to maximize the response of
your system.
Beyond processing, the ZonePro? products offer multiple forms of control to further extend the
versatility of your system. From easy-to-use wall panel Zone Controllers for standard end-user
functions like source select and volume control to advanced system control including a built-in
Real Time Clock that can provide programmable system changes throughout the day or week.
For system setup and monitoring the ZonePro Designer software provides an intuitive interface
and a speedy setup Wizard for configuring and editing all system parameters.
The ZonePro? 640 and 641 will take your Commercial Audio system to the next level with advanced
processing, versatility and control.
? Advanced Feedback Suppression (AFS?)
? Autowarmth?
? Auto Gain Control
? Compression
? Limiting
? Noise Gating
? Notch Filtering
? Bandpass and Crossover Filters
? Parametric EQ
? Security Lockout
? Wall Panel Control
? RS-232 Control
? Windows? 2000 and XP GUI
? IEC, UL and CSA Approvals
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