Description
Description
The AudioCenter D4.4K is a four-channel professional Class-D amplifier with integrated high-precision DSP for medium- and high-output sound-reinforcement systems. It combines amplification, signal routing, equalization, crossovers, FIR filtering, delay, compression, limiting, and Ethernet management in one 2U chassis.
The current manufacturer platform delivers 700 watts per channel into 8 ohms, 1,200 watts per channel into 4 ohms, or 2,400 watts per bridged pair into 8 ohms. Four analog and four AES digital inputs feed a 48 kHz/24-bit DSP section with 15-band input EQ, 10-band output EQ, up to 90 ms of input delay, up to 20 ms of output delay, and four channels of 2,048-tap FIR processing.
BrainCore NET provides centralized network monitoring and control, while USB-B and the front-panel display support local configuration. High-efficiency Class-D circuitry, forced-air cooling, and comprehensive protection make the D4.4K suitable for installed sound, portable PA, rental inventories, and multi-amplifier professional systems.
Power Specifications
| 8-Ohm Stereo Power | 700 watts × 4 |
|---|---|
| 4-Ohm Stereo Power | 1,200 watts × 4 |
| 8-Ohm Bridged Power | 2,400 watts × 2 |
| Output Topology | Class D |
| Efficiency | Greater than 90% |
| Frequency Response | 20 Hz–20 kHz, ±1 dB |
| Signal-to-Noise Ratio | At least 100 dB, A-weighted |
| Damping Factor | At least 400 at 1 kHz / 8 ohms |
| THD+N | 0.1% or less at 1 kHz, 8-ohm half power |
DSP and Control
| DSP Resolution | 48 kHz / 24-bit |
|---|---|
| Analog Inputs | 4 |
| AES Digital Inputs | 4 |
| Input Processing | Noise gate, gain, sensitivity, phase, mute, 15-band EQ, HPF/LPF, and up to 90 ms delay per channel |
| Output Processing | 10-band EQ, HPF/LPF, up to 20 ms delay, compressor, limiter, gain, phase, and mute |
| Crossover Filters | Butterworth, Linkwitz-Riley, and Bessel; 6–48 dB/octave |
| FIR Processing | 4 × 2,048 taps |
| Operating Modes | Matrix, stereo, parallel, and bridge |
| USB Control | USB-B |
| Network Control | 2 × RJ45 with BrainCore NET support |
Connections and Physical Specifications
| Input Connectors | Male and female XLR |
|---|---|
| Speaker Outputs | Speakon |
| Input Sensitivity | 0, 6, or 12 dBu |
| Maximum Input Level | At least 18 dBu |
| Power Supply | 100–130 or 220–240 volts AC, 50/60 Hz |
| Power Consumption | 750 watts at 1/8 output power into 4 ohms |
| Cooling | Front-to-back forced-air cooling |
| Rack Height | 2U |
| Dimensions | 483 × 88 × 404 mm |
| Net Weight | 10 kg |
Protection and Features
- Integrated four-channel Class-D amplification and DSP
- BrainCore NET centralized monitoring and control
- Analog and AES digital inputs
- IIR and four-channel FIR processing
- Input and output parametric equalization
- Matrix routing and bridge operation
- DC, short-circuit, thermal, overload, soft-start, and limiter protection
- High-efficiency switching power supply
- Modular construction for service and maintenance
- Designed for professional installed and portable audio systems