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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 | Behringer CX-3400 3-Way Stero/4-Way Mono Frequency Crossover with Limiters
The CX3400 is an active frequency crossover enabling 2 or 3-way stereo or even 4-way mono operation. Each band features two 24-dB Linkwitz-Riley filters, as well as individual IGC limiters, while the integrated delay enables flexible time alignment. Polarity switches for each output allow quick and easy runtime compensation for various driver and horn types.2
Respectively:
3-Way stereo or 4-way mono
24 dB / octave Linkwitz-Riley filter
Mono-Sub switchable
LF / HF gain regular / mutable
CD horn EQ switchable
Vertex frequency tunable
Factor switching (10x)
Multi-band limiter switch / variable (threshold)
Limit display each way
LF Delay (max 2ms / 60cm)
Phase reverse
25 Hz subsonic filter, sym
XLR in / out with multiband limiters
Dimensions: 19", 1U, 147 mm case depth
Weight: 1.7 kg |
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 |
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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 | 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 |
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Input Impendance: | >10 | kΩ | Output Impendance: | 50 | Ω | Maximum Level: | + 20 | dBu | Type: | XLR 3 | Electronically balanced |
AUDIO PERFORMANCE |
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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 |
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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 |
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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 |
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Threshold: | -20 to +20 | dBu | Attack Time: | 0.3 to 100 | ms | Release Time: | 2 to 32 | X the attack time |
EQUALISATION |
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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 |
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Filter Types: | Butterworth, Bessel, Linkwitz Riley | | Slopes: | 6 to 24dB/oct (96kHz) | 6 to 48dB/oct (48kHz) |
POWER REQUIREMENT |
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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 |
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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 |
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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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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)
| More sound to your amps and speakers
The secret to making speakers sound great lies with the crossover you use. With the dbx® 234xs Crossover you'll get great performance, ultra low-noise, rugged reliability and four decades of dbx knowledge and expertise in building the world's finest processors. The 234xs uses precision filters to separate the audio signal and direct the correct frequencies to your loudspeaker drivers. By directing only the specific frequency bands to each speaker driver the 234xs leaves your amplifiers free to use their full power on the usable signal eliminating distortion and giving your PA system a cleaner and better sound.
The dbx 234xs is a dual channel crossover with all the features you would expect from a professional product. It features Linkwitz-Riley 24dB per octave filters, independent output gain controls for level matching, output phase inversion, 40 Hz low cut filter, and optional mono summing of the low frequency (subwoofer) output. Everything in the design exudes great precision from the solid "click" controls to the high quality XLR inputs and outputs.
XLR balanced ins and outs
Mode switches for mono 4-way or stereo 2-way/3-way operation
Low frequency summed (subwoofer) output
x10 range switch on both channels
40Hz high pass (low cut) filter both channels
Phase reverse switch on all outputs
Individual level controls on all outputs
24dB per octave Linkwitz-Riley filters (the professional standard)
Stereo/Mono status LEDs indicate the selected mode
dbx® 2 year parts and labor as standard
CSA NRTL/C approved
CE compliant
Input Connectors |
XLR |
Input Type |
Electronically balanced/unbalanced, RF filtered |
Input Impedance |
Balanced >50k ohm, unbalanced >25k ohm |
Max Input |
>+22dBu balanced or unbalanced |
CMRR |
>40dB, typically >55dB at 1kHz |
Output Connectors |
XLR |
Output Type |
Impedance-balanaced/unbalanced, RF filtered |
Output Impedance |
Balanced 200 ohm, unbalanced 100 ohm |
Max Output |
>+21dBu balanced/unbalanced into 2k ohms or greater |
Bandwidth |
20Hz to 20kHz, +/-0.5dB |
Frequency Response |
90 kHz, +0/-3 dB |
Signal to Noise Ratio |
Ref: +4 dBu, 22 kHz measurement bandwidth |
Signal-to-Noise (Stereo Mode) |
>94dB (Low Output), >93dB (Mid Output), >90dB (High Output) |
Signal-to-Noise (Mono Mode) |
>94dB (Low Output, Low/Mid Output); >92dB (High/Mid Output); >88dB (High Output) |
Dynamic Range |
> 106 dB, unweighted, any output |
THD+Noise |
Interchannel Crosstalk |
Crossover Frequencies (Stereo Mode) |
Low/Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting); Low/High: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting); Mid/High 450Hz to 9.6kHz (x10 setting) |
Crossover Frequencies (Mono Mode) |
Low/Low-Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting); Low-Mid/High-Mid: 450 Hz to 9.6 kHz; High-Mid/High: 450 Hz to 9.6 kHz |
Crossover Filter Type |
Linkwitz-Riley, 24 dB/octave, state-variable |
Low cut Switch |
Activates 40 Hz Butterworth, 12 dB/octave high-pass filter, one switch per channel. |
Phase Invert Switch |
Inverts the phase at the output, one switch per output. |
x1 / x10 Switch |
Multiplies the low-high(mono: low/mid and high/mid) crossover frequency range of the front-panel markings by a factor of 1 or 10, one switch per channel. |
Mode Switch |
Selects stereo/mono and 2/3/4-way operation |
LF Sum Switch |
Selects normal (stereo) or mono-summed low frequency operation and disables Ch 2ʼs low output phase invert LED to indicate that this output is not operational in the LF sum mode. |
Indicators |
Stereo Operation (Green); Mono Operation (Yellow); Low Cut (Red-per channel); x10 (Green-per channel); Phase Invert (Red-per output) |
Operating Voltage |
100-120 VAC 50/60Hz; 120 VAC 60Hz 230 VAC 50/60Hz |
Operating Temperature |
32°F to 113°F (0°C to 45°C) |
Power Consumption |
15W |
Power Connector |
IEC receptacle |
Dimensions |
1.75" H X 19" W X 6.9" D (4.4cm x 48.3cm x 17.5cm) |
Unit Weight |
4.0 lbs. (1.8 kg) |
Shipping Weight |
5.8 lbs. (2.6 kg) |
| 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 |
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