Klein + Hummel Pro C 28

Klein + Hummel Pro C 28 Digital FIR Controller Characteristics :

     Stereo-4-Way digital loudspeaker controller designed for use with studio- and PA-loudspeaker systems
     Special digital FIR filtering for a completely independent equalization of system amplitude and phase (FIR = Finite Impulse Response)
     "Linear phase" equalization resulting in a constant group delay over the entire frequency range of the system
     Additional IIR digital filter section providing user-defined equalization with real-time control of changed parameters:
       Parametric EQ with 10 full parametric bands of equalization independently for each channel
       Room-EQ with IIR filters
     Four separate digital limiters included in every single output channel:
       Peak/RMS limiter to avoid distortion and loudspeaker damage by restricting the peak power of the power amplifier
       Thermo/excursion limiter to avoid speaker damage caused by overheating of voice coil
     Compact 19" 2U rackmount unit
     All important set-ups are done automatically by loading the individual parameter setup which is delivered for each studio monitor together with the Pro C 28
     All settups in the different menus of the controller can be stored in a system setup
     The possibility to optimize the system performance in a given installation by creating individual, room-specific FIR filter setups which can match every desired room equalization

State-of-the-art audio technology and performance :
     Electronically balanced symmetric analogue input stage with lowest noise figures and distortion
     2 stacked AD converters (D/S) on each channel ("Gain Ranging" technique) to provide an input dynamic range of more than 130 dB
     Digital signal processing with 48 BIT precision
     Latest generation DA converters (D/S)
     Smooth LP filtering after DA conversion to guarantee a very musical and clear sound
     High performance power supply to provide double voltage regulation for each functional block
     Wide connection facilities for analogue and digital signals
     Highest quality input transformer can be switched into the analogue input circuit

Extensive limiter concept :
Every output channel (4 outputs left channel and 4 outputs right channel) features the following limiter structures which work independently from each other:
     Digital peak and RMS limiter in "look-ahead"-technology with digital modelling of the power amplifiers¢• load-performance
       Short attack time constant for safe prevention of power amplifier clipping
       "Controlled Overshoot" allows to use full peak power of the amplifier
       RMS limiter restricts the maximum continuous power to the power amp¢•s max. value
     Digital thermo and excursion limiter with modelling of voice-coil temperature and cone excursion
       Long attack time constants which is adapted to voice coil heating process of each driver
       Prevention of thermal driver damage
       Prevention excessive cone excursion
     All limiter settings are included in the parameter setup and will be loaded automatically at system setup

Comfortable Operation :
     Easy stand-alone operation via front panel controls
     Alternative operation via remote control RC 55 (optional)
     Optional operation via IBM-compatible PC (RS232 port integrated)
     Connection of several units via internal MIDI port (IN, OUT, THROUGH)
     New parameter setups transfer into the PRO C 28 by connecting a PC to the RS232 port
     Internal memory of storing up to 70 different parameter setups
     Switching between different parameter setups can be done in real time during normal operation
     Every setup (even the selected parameter setup) can be stored within a general system setup
Remote control providing direct access selection of up to four different system setups

Operation with monitor specific parameter setups :
     To upgrade analogue K + H studio monitors (i.e. K + H models O 300 D)
       Room and positioning equalization using the IIR EQ section and creating a room specific FIR filter setup for maximum system performance.
       Simple connection between Pro C 28 and K + H monitors via a multicore cable with dedicated multiple pin XLR terminals
       System enhancement with one or more additional subwoofers (i.e. K + H model O 900)
       Subwoofers will be considered in the parameter setup so that amplitude and phase equalization is extended to the lowest frequencies

One way full range operation :
     High end digital EQ with multiple delay options and sophisticated limiter concepts in a single unit
       Equalization of other studio monitors and sound reinforcement systems
       Possibility to use the IIR EQ section and / or the integrated FIR filters to realize filters with a linear phase response


Klein + Hummel Pro C 28 Digital FIR Controller Features :

Cutting-edge audio technology :
     Low distortion electronic or transformer balanced analog inputs
     2 stacked Delta-Sigma A/D converters per channel providing more than 130 dB dynamic range
     48-bit digital signal processing
     High-quality Delta-Sigma D/A converters
     Moderate low pass filtering after DA conversion guarantees a °∞musical°± sound stage
     Comprehensive power supply with double voltage regulation for each channel
     Numerous connection options for analog and digital signals
     High-quality input channel can be switched to analog

Comfortable operation :
     Attractive Blue Vacuum Fluorescent Display (VFD) shows all settings
     Simple 3-level shallow menu structure accessible from the front panel
     Optional Klein + Hummel RC 55 remote control
     PC compatible RS-232 port
     Connection of several units for synchronized operation using internal MIDI port (in, out, thru)
     Internal memory can store over 70 different parameter setups
     Switch between parameter setups during use
     All settings can be stored inside the hardware memory
     Switching between setups possible using remote control

 General Description

Characteristics
     Stereo-4-Way digital loudspeaker controller designed for use with studio- and PA-loudspeaker systems
     Special digital FIR filtering for a completely independent equalization of system amplitude and phase (FIR = Finite Impulse Response)
     "Linear phase" equalization resulting in a constant group delay over the entire frequency range of the system
     Additional IIR digital filter section providing user-defined equalization with real-time control of changed parameters:
     Parametric EQ with 10 full parametric bands of equalization independently for each channel
     Room-EQ with IIR filters
     Four separate digital limiters included in every single output channel:
     Peak/RMS limiter to avoid distortion and loudspeaker damage by restricting the peak power of the power amplifier
     Thermo/excursion limiter to avoid speaker damage caused by overheating of voice coil
     Compact 19" 2U rackmount unit
     All important set-ups are done automatically by loading the individual parameter setup which is delivered for each studio monitor together with the Pro C 28
     All settups in the different menus of the controller can be stored in a system setup
     The possibility to optimize the system performance in a given installation by creating individual, room-specific FIR filter setups which can match every desired room equalization

State-of-the-art audio technology and performance
     Electronically balanced symmetric analogue input stage with lowest noise figures and distortion
     2 stacked AD converters (D/S) on each channel ("Gain Ranging" technique) to provide an input dynamic range of more than 130 dB
     Digital signal processing with 48 BIT precision
     Latest generation DA converters (D/S)
     Smooth LP filtering after DA conversion to guarantee a very musical and clear sound
     High performance power supply to provide double voltage regulation for each functional block
     Wide connection facilities for analogue and digital signals
     Highest quality input transformer can be switched into the analogue input circuit

Extensive limiter concept
Every output channel (4 outputs left channel and 4 outputs right channel) features the following limiter structures which work independently from each other:
     Digital peak and RMS limiter in "look-ahead"-technology with digital modelling of the power amplifiers¢• load-performance
     Short attack time constant for safe prevention of power amplifier clipping
     "Controlled Overshoot" allows to use full peak power of the amplifier
     RMS limiter restricts the maximum continuous power to the power amp¢•s max. value
     Digital thermo and excursion limiter with modelling of voice-coil temperature and cone excursion
     Long attack time constants which is adapted to voice coil heating process of each driver
     Prevention of thermal driver damage
     Prevention excessive cone excursion
     All limiter settings are included in the parameter setup and will be loaded automatically at system setup

Comfortable Operation
     Easy stand-alone operation via front panel controls
     Alternative operation via remote control RC 55 (optional)
     Optional operation via IBM-compatible PC (RS232 port integrated)
     Connection of several units via internal MIDI port (IN, OUT, THROUGH)
     New parameter setups transfer into the PRO C 28 by connecting a PC to the RS232 port
     Internal memory of storing up to 70 different parameter setups
     Switching between different parameter setups can be done in real time during normal operation
     Every setup (even the selected parameter setup) can be stored within a general system setup
Remote control providing direct access selection of up to four different system setups

Operation with monitor specific parameter setups
     To upgrade analogue K + H studio monitors (i.e. K + H models O 300 D)
     Room and positioning equalization using the IIR EQ section and creating a room specific FIR filter setup for maximum system performance.
     Simple connection between Pro C 28 and K + H monitors via a multicore cable with dedicated multiple pin XLR terminals
     System enhancement with one or more additional subwoofers (i.e. K + H model O 900)
     Subwoofers will be considered in the parameter setup so that amplitude and phase equalization is extended to the lowest frequencies

One way full range operation
     High end digital EQ with multiple delay options and sophisticated limiter concepts in a single unit
     Equalization of other studio monitors and sound reinforcement systems
     Possibility to use the IIR EQ section and / or the integrated FIR filters to realize filters with a linear phase response
Features

Cutting-edge audio technology
     Low distortion electronic or transformer balanced analog inputs
     2 stacked Delta-Sigma A/D converters per channel providing more than 130 dB dynamic range
     48-bit digital signal processing
     High-quality Delta-Sigma D/A converters
     Moderate low pass filtering after DA conversion guarantees a °∞musical°± sound stage
     Comprehensive power supply with double voltage regulation for each channel
     Numerous connection options for analog and digital signals
     High-quality input channel can be switched to analog

Comfortable operation
     Attractive Blue Vacuum Fluorescent Display (VFD) shows all settings
     Simple 3-level shallow menu structure accessible from the front panel
     Optional Klein + Hummel RC 55 remote control
     PC compatible RS-232 port
     Connection of several units for synchronized operation using internal MIDI port (in, out, thru)
     Internal memory can store over 70 different parameter setups
     Switch between parameter setups during use
     All settings can be stored inside the hardware memory
     Switching between setups possible using remote control


Includes :
     1x Pro C 28
     1x Power cord
     1x Operation manual



Optional Accessories :
 RC 55, CMK 5

Klein + Hummel Pro C 28 Specifications :

Connections :
Analog inputs : 2 x XLR, electronically balanced or transformer balanced (switchable)
Impedance : 10 k•ÿ
Max. input level : 24 dBu
CMRR : > 80 dB @ 15 kHz
Crosstalk : > 80 dB
Analog outputs : 8 x XLR, balanced
Impedance : < 70 •ÿ
Output rang steps : 16, 12, 6 dBu
Resolution, type : 24 Bit DA, DS
Digital inputs : AES/EBU, XLR (110 •ÿ transformer balanced, AES3id, S/P-DIF BNC (75 •ÿ)
Digital outputs (insert) : AES/EBU (XLR, transformer balanced)
Remote control, interface : MIDI, RS232 (D-Sub D 25)
Baud rate : 9600, 31520
Remote control : IR remote RC 55 (optional)

Performance :
THD : 0,0004 % unweighted, 20 Hz - 20 kHz
Noise AD : - 126 dBFS

Signal treatment :    
AD conversion : 24 Bit stacked AD, DS
Sample rate : 44,1 kHz, 48 kHz
DA conversation : 24 Bit, DS
Latency time : Basic latency 5-7 ms, channel-dependent)
Filter latency time : Depends on filter type

Filter section and limiter :    
Factory parameter setups    
Filter algorithm : FIR-filter (Finite Impulse Response)
Max. number of parameter setups : Depends on filter length, typ. 50
Filter types : Linear phase, mixed linear / minimal phase, minimal phase
Number of output ways : 1-4
Equalizations : Individual according to connected speakers, linearized amplitude and phase
Slopes : Freely definable up to approx. 96 dB/oct.
Peak limiter : Look-ahead type with 1,5 ms and "Controlled Overshoot" to use amplifier¢•s max. impulse output power
Thermo limiter : Simulation of voice coil and magnet temperature
Room-specific parameter setups : Same as factory parameter setups, requires individual system alignment by K+H
User-defineable parameter equalizer : IIR filter algorithm (Infinite Impulse Response)
Number of filters/channels : 10 filters, can be configured as fully parametric, High/Low-Shelving 6/12dB/oct, high/lowpass 6/12 dB/oct; peak filter
Room EQ : IIR Filter algorithm (Infinite Impulse Response)
Filtertypes : Low-cut; low; mid; high
Delay : Master delay 0-999 ms, channel delay 0-92 ms

Power supply :
Mains : 120 V AC (90-130 V), 230 V AC (160-250 V) internally switchable
Power consumption : 32 VA

Mechanical :
Height x width x depth :
 88 (2HE) x 483 (19" EIA Standard rack) x 310 mm,
 3.5" (2RU) x 19" (EIA Standard rack) x 12.2"
Weight :
 4,9 kg (10.8 lbs)


Includes :
     1x Pro C 28
     1x Power cord
     1x Operation manual


Optional Accessories :
 RC 55, CMK 5