Installed Sound Products

Characteristics

	Stereo-4-Way digital loudspeaker controller designed for use with 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 setups are done automatically by loading the individual parameter setup which is delivered for each PA loudspeaker together with the Pro C 28
	All setups 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 switched 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 (RS-232 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 RS-232 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

Wide Range of Applications

1. Operation with specific parameter setups for PA systems

	Parameter setups for operation of loudspeakers, subwoofers and power amplifiers Or any loudspeaker / amplifier combination, also for amplifiers of other manufacturers Simple and comfortable adjustment for SPL and delay of subwoofers Variety of equalizations using FIR filter technology
	Room and position equalization of system with integrated PEQ using IIR digital technology.
	Optional room equalization using FIR filter setups

2. One way full range operation

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

Connections
Analog inputs	2 x XLR, electronically balanced or transformer balanced (switchable)
Impedance	10 kOhm
Max. input level	24 dBu
CMRR	> 80 dB @ 15 kHz
Crosstalk	> 80 dB
Analog outputs	8 x XLR, balanced
Impedance	< 70 Ohm
Output rang steps	16, 12, 6 dBu
Resolution, type	24 Bit DA, DS
Digital inputs	AES/EBU, XLR (110 Ohm transformer balanced, AES 3id, S/P-DIF BNC (75 Ohm)
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 us
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 data
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)
Accessorie	RC 55