Kling & Freitag CD44 Digital System Controller

Kling & Freitag CD44 Digital System Controller

The signal processor CD 44 is a digital 4 in 4-way speaker controller that can process both analogue and digital signals in the AES/EBU format up to 192 kHz.
The controller is equipped with the finest AD and DA state-of-the-art converters as well as 3 micro-controllers and 8 integrated signal processors (DSP). It not only offers excellent audio results, but also a multitude of special features and novel functions.

Specifications :

• Input Signal Processing
• Input delay : delay up to 200 ms with 100 μs resolution
  • Filters : 31-band graphic EQ
  • 4 selectable filters : (Bell, LShelv, HShelv, HighP, LowP, AP)
  • Amplification : digital gain control +20 dB to -96 dB
• Sense Inputs
  • Output delay : 40 ms total (2 x 20 ms) with 10 μs resolution,
  • Filters :
    • 31-band graphic EQ
    • 4 selectable filters (Bell, LShelv, HShelv, HighP, LowP, AP)
  • Limit : RMS and peak limiter in the speaker specific K&F LS-Blocks
  • Gain : digital gain control +20 dB to -96 dB
• Sense Inputs
  • Maximum input level : 150 Vrms
  • Gain determination : 20 dB to 45 dB
• Analog-to-Digital Inputs
  • Input impedance : 10 kOhm balanced, 10 kOhm unbalanced, electronically balanced
  • Nominal input level : +6 dBu
  • Maximum input level : +18 dBu
  • Frequency response : +0/-0,2 dB, 2 Hz bis 20 kHz
  • THD + noise : 0.0006 % (-105 dB) typical @ 1 kHz/-1 dBfs
  • Dynamic range : 119 dB typical, 20 Hz to 20 kHz, A-weighted @ +18 dBu
  • CMRR :
    • 75 dB typical @ 1 kHz, 70 dB typical @ 20 kHz
    • 65 dB, 20 Hz to 20 kHz,
• AES / EBU Inputs
  • Supported resolutions : up to 24 bit
  • Supported sample rates : 44.1 – 192 kHz, internal dejittering via sample rate converter
• Digital-to-Analog Outputs
  • Output impedance : <40 Ohm, electronically balanced
  • Nominal output level : +6 dBu
  • Maximum output level : +18 dBu
  • Frequency response : +0/-0.2 dB, 2 Hz to 20 kHz
  • THD + noise : 0.0006 % (-105 dB) typical @ 1 kHz/-1 dBfs
  • Dynamic range : 119 dB typical, 20 Hz to 20 kHz, A-weighted @ +18 dBu
• Analog-In to Analog-Out
  • Frequency response : 20 Hz to 20 kHz, ±0.1 dB
  • Dynamic range : 115 dB typical, 20 Hz to 20 kHz, unweighted
  • THD + noise :
    • 0.0007 % (-103 dB) typical @ 1 kHz / +17 dBu (all gains zero)
    • 0.001 % (-100 dB) typical @ 1 kHz / +6 dBu (all gains zero)
  • Conversion resolution : 24 Bit
  • Internal sample rate : 96 kHz
  • Internal data path : 28 bit integer, arithmetic precision: 76 bit
  • System propagation delay : 0.5 ms (analogue to analogue)
• Remote Interface
  • RJ45 EtherCon™ connector for a 10/100Base-TX ethernet (IP) connection