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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
| Advanced Feedback Suppression Processor with Full LCD Display
The AFS2 Dual-Channel Advanced Feedback Suppression Processor from DBX protects your ears and audio equipment from annoying and potentially damaging audio feedback without altering your sound. The AFS2 features application-specific filter types for speech, music low, music medium, and music high. The 24 fixed or live narrow-band notch filters are capable of removing frequencies at 1/80 of an octave, ensuring an optimal frequency response without the possibility of feedback.
The front panel features the wizard function to take the guesswork out of setting up any room by incorporating an advanced feedback suppression module and providing a full LCD display for system settings and menus. Additionally, the AFS2 offers a five-segment LED for accurately monitoring input levels for each channel, while the notch filter indicator allows you to monitor the number of filters applied. Dedicated bypass buttons are included to help isolate problem channels. The rear panel offers XLR and 1/4" inputs and outputs, both switchable between +4 and -10 dB operations. A USB port has been provided for firmware updates. The AFS2 ships with a standard IEC power cable.
Number of Channels |
2 |
Inputs |
Connectors: Female XLR and 1/4" TRS
Type: Electronically balanced and unbalanced, RF filtered
Impedance: Balanced 50 kohm, unbalanced 25 kohm
Max Line Level: +20 dBu |
Input CMRR |
>40 dB, typically >55dB @ 1 kHz |
Outputs |
Connectors: Male XLR and 1/4" TRS
Type: Electronically balanced and unbalanced, RF filtered
Impedance: Balanced >120 ohms, unbalanced >60 ohms
Max Level: +20 dBu |
A/D/A Converter |
A/D Converter: DBX type IV conversion system
A/D Dynamic Range: >113 dB A-weighted, >110 dB, unweighted, 22 kHz BW
Type IV Dynamic Range: >119 dB, A-weighted, 22 kHz BW; >117 dB, unweighted, 22 kHz BW
A/D Conversion: 24-bit
Sample Rate: 48 kHz
D/A Dynamic Range: 112 dB A-weighted, 109 dB unweighted
D/A Conversion: 24-bit |
Dynamic Range |
109 dB A-weighted, 106 dB unweighted, 22 kHz BW |
THD + Noise |
0.003% typical at +4 dBu, 1 kHz |
Frequency Response |
20 Hz to 20 kHz, ±0.5dB |
Crosstalk |
Interchannel Crosstalk: >80 dB typical
Crosstalk Input to Output: >80 dB |
Power |
US: 100 to 120 VAC 60 Hz
EU: 220 to 240 VAC 50 Hz
9 W |
Dimensions (HxDxW) |
1.8 x 5.8 x 19.0" / 4.4 x 14.6 x 48.3 cm |
Weight |
4.5 lb / 2.0 kg |
| Digital stereo active crossover with 4 inputs and 8 outputs, incl. software .
- Flexible routing configurations for all standard mono and stereo output operating modes
- 4 analog inputs and 8 analog outputs (XLR)
- Active frequency filter types (Bessel, Butterworth and Linkwitz-Riley) with slopes up to 24 dB/octave split up the audio signal into different frequency bands
- Incl. software editor (for PC and Mac) for remote control via computer through USB interface: store, transfer, and manage your presets
- Up to 30 user presets storable in the device via software
- 5 menu languages selectable (German, English, French, Spanish, Dutch)
- Alphanumeric LCD screen with 2 lines of 16 characters each
- Input sensitivity digitally adjustable
- Inputs and outputs with 4-digit LED level meter as well as clip and limit LED indicator
- Mute switch with LED indicator per output
- 7-band parametric EQ per output
- Up to 7 ms signal delay adjustable for the outputs
- Output limiter with adjustable limits and automatic attack and release settings as overload protection for your amplifying system
- Switchable phase
- Lock function for prevents undesired changes to settings
- Rack installation, 1 U
- Windows XP, Vista, 7, 10 and Mac OS X 10.5.8 and better
- Digital signal processor
- The device can be connected via USB to the PC in connection with DXO Software
The firmware can be updated via the PC connection
- (19") 48.3 cm rack installation 1 U
Power supply: |
100-240 V AC, 50/60 Hz
6 V DC 800 mA |
Power connection: |
Mains input via Coaxial power connector (M) power supply cord with AC adapter (provided) |
Frequency range: |
10 - 22000 Hz |
THD: |
<0,005 % at 1 kHz |
DSP: |
Digital signal processor |
Crossover frequency: |
20-20000 Hz |
Impedance: |
Input 10 kOhm
Output 50 Ohm |
Gain: |
Output: -50 dB to +12 dB |
Filter: |
Linkwitz-Riley; Butterworth; Bessel; 6db/oct; 12db/oct; 18db/oct; 24db/oct |
Delay: |
0 - 7 ms |
Dynamic range: |
Input: 114 dB
Output: 110 dB |
Sample rate: |
48 kHz |
Connections: |
Input: line via 4 x 3-pin XLR
Output: line via 8 x 3-pin XLR |
Max. level: |
Input: +22 dBu
Output: +9 dBu |
USB port: |
Typ B |
PC connect: |
DXO Software via USB, firmware can be updated |
Housing design: |
(19") 48.3 cm rack installation 1 U |
Dimensions: |
Width: 48,3 cm
Depth: 22,3 cm
Height: 4,45 cm |
Weight: |
1,90 kg |
|
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)
| Behringer DCX2496 Overview
The DCX2496 ULTRADRIVE PRO from Behringer is a digital loudspeaker management system, that provides excellent audio quality, along with a comprehensive feature list. It allows for precise set-up of multiple loudspeaker arrays, suitable for live sound, fixed installations that require control of loudspeaker systems, and other contractor-installed applications.
Each of the three-inputs and six-outputs have fixed processing blocks, including gain, delay, EQ and dynamic EQ on the input channels, and gain, crossover, EQs, limiter and delays on the output side. One of the inputs can accept a stereo AES/EBU digital signal. An integrated sample rate converter assists in accepting various sample rates. Additionally, an internal input-sum signal is easily set-up.
Four different mono and stereo output operating modes are available, all with individual crossover filter types with selectable roll-off characteristics. Input and output delays allow for time adjusting signals to compensate for ambient temperature changes or for adjusting arrival time differences for individual speaker clusters. EQs can be used for both musical enhancement or for level-dependent equalization. Brick-wall limiters guarantee speaker protection.
Remote control of one or several units can be accomplished utilizing downloadable software for a Windows based computer. Set-ups can be saved to the software, or to an optional PCMCIA card for the ultimate in portability. Servo-balanced, gold-plated XLR connectors for all inputs and outputs guarantee excellent connectivity.
- Three-input, six-output loudspeaker management system
- Four different mono- and stereo-output operating modes
- Individual crossover filter types including Butterworth, Bessel and Linkwitz-Riley, with selectable roll-off characteristics from 6dB to 48dB per octave
- Choice of high-, band- and low-pass filters for each input and output
- Dynamic EQ for level-dependent equalization and parametric EQ selectable for each channel
- “Zero" attack limiters on all output channels for optimal signal protection
- Automatic or manual-adjustable delays for all inputs and outputs allow for adjustment due to room temperature, phase and arrival time differences
- Link option via RS-485 network interface allows for linking multiple units for larger installation requirements
- Downloadable software enables single- or multiple-unit remote control utilizing a Windows based computer
- Sixty user-defined internal presets can bestored via software or on a PCMCIA card
- Internal universal power supply allows the unit to operate virtually anywhere
Frequency Response |
10Hz to 35kHz, -1dB |
Dynamic Range |
109dB |
Input Connections |
3 x XLR |
Output Connections |
6 x XLR |
Input Impedance |
20kΩ @ 1kHz |
Output Impedance |
160Ω @ 1kHz |
Maximum Input Level |
+22dBu |
Maximum Output Level |
+22dBu |
Sample Rate |
32kHz to 96kHz |
RTA Mic Phantom Voltage |
+15V |
Crosstalk (Main Outputs) |
-100dB @ 10dBu In |
THD & Noise |
0.007% @ 0dBu In |
Dimensions |
19" x 8.5 x 1.75" (483 x 217 x 45mm) |
Weight |
6.6 lbs (3 kg) |
|
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