Dynacord XA-4000

The universally usable Xa 4000 active 2-way power amplifier provides Class H technology and a switching power supply. Xa 4000 power amps combine outstanding audio performance, highest reliability and operational safety allowing easy setup and operation of active 2-way systems with a crossover frequency of 140Hz between bass and mid/high cabinets. The power amp’s output capacity of 1100W/4ohms for the bass channel and 900W/4ohms for the mid/high channel allows the connection of up to four 8ohms cabinets per channel. The integrated frequency crossover separates the bass from the mid/high range at 140Hz. The x-over is carried out as a modified Butterworth-crossover with a slope of 18dB/octave. The crossover frequency of 140Hz allows the connection of basically any mid/high and bass cabinet. Using 2-or 3-way fullrange speaker systems – for example DYNACORD F150 – as mid/high cabinets is possible as well. Individual dB-scaled level controls for SUB and TOP channels, which are carried out as recess-mounted detent potentiometers provide a control range between +6dB and –∞ allow combining bass and mid/high cabinets with quite different „efficiency“. The frequency response of the Xa 4000 particularly accounts for the requirements of „Live“ applications. An integrated Lo-Cut filter attenuates low-frequency signals such as rumble and subsonic noise protecting the bass cabinets from being damaged by mechanical overload.Optimized for the usage of medium sized and large-format vented bass cabinets, bass horn speakers, Manifolds and Planar Waveguide horns, the LPN – Low-Pass-Notch filters – bass equalization corrects the transient response of connected bass cabinets. The speaker outputs of the power amps are carried out as SPEAKON connectors (female). The pin-assignment of the system connector is: bass channel via pins 1+ and 1-, mid/high channel via pins 2+ and 2-. The use of 4-core speaker cables allows for convenient, quick and easy as well as mismatch-proof setup of loudspeaker systems. Separate SUB and TOP Speakon-sockets are provided in addition to the system connector. The output signal at these connectors is present at pins 1+ and 1-, which allows easy connection of basically any type of speaker system, even if it provides no system cabling facilities. The transmission qualities of the Xa 4000 are simply extraordinary. The switching power supply technology derived from the SWITCHMODE PRECISION Series and the consistent use of Class-H technology provide extensive headroom far above the stated nominal output and conspicuous reduction in weight and leakage power at the same time. The power amplification stages of the Xa 4000 are designed in Class-H technology, so that the power amp provides extremely fast, signal-dependent operating voltage switching, which, at the time needed, results in doubling the regular supply voltage. Compared to power amps operated in Class-AB mode, Class-H power amps generate by far less leakage power at identical output. Consequently, the reduction of leakage power or dissipation is synonymous to less waste heat. In other words: energy is used more efficiently! As a result, installing Class-H power amps within rack shelf systems or cabinets is possible with less space between appliances. In addition to that and despite offering identical output, power consumption is a lot less than in Class-AB operation. Being protected against thermal and electrical overload, short circuit and the occurrence of HF/DC at the outputs, the Xa 4000 fulfills even the most demanding requirements of Pro-Audio touring applications. Back-EMF-Protection eliminates the risk of the output transistors being damaged by electrical energy back-feed. The power outputs are switched via relay with a time delay during soft-start and an inrush current limiter additionally prevents mains fuses from blowing. Mechanical construction and workmanship also comply with the highest precision manufacturing standards. The robust chassis is extremely rigid. Two three-speed high performance fans (off/slow/fast) guarantee outstanding thermal stability at absolute low running noise. Front-to-rear ventilation allows trouble-free operation even in smaller amp-racks. The electronically balanced inputs are carried out via XLR-type connector. A Direct-Out for through connecting the audio signal is also provided via XLRM-type connectors. The easily readable LED display provides a quick overview of the power amp’s current operational status.



Specifications

Maximum RMS Voltage Swing 78 VTHD = 1%, 80Hz SUB, 1kHz TOPPower Bandwith TD = 1%, ref. 1kHz, half power @ 4 Ohms 10 Hz … 50 kHzVoltage Gain ref.1kHz 37.3 dBInput Sensitivity at rated output power, 1kHz 0 dBu (0.775 V rms)THD at rated output power, MBW = 80kHz, 1kHz < 0.05%
Maximum Input Level +22 dBu (9.76 V rms)Input Impedance active balanced 20 kOhmsDamping Factor 1kHz > 300Slew Rate 30 V/µsSignal to Noise Ratio Amplifier A-weighted 102 dBOutput Stage Topology Class HPower Requirements 240, 230, 220, 120V or 100V 50 Hz ... 60 Hz (factory configured)Power Consumption at 1/8 max. output power @ 4 Ohms 850 WProtection Audio limiters, High temperature, DC, HF, Back-EMF,Peak current limiters, Inrush current limiters, Turn-on delayCooling Front-to-rear, 3-stage-fansAmbient Temperature Limits +5°C … +40°C ( 40°F … 105°F)Safety Class I
Dimensions (W x H x D), mm483 x 88.1 x 384Weight: 8.25kg(18.2lbs)