XMIC 04_100605
Contents
1. Dood Fig PCB YG Bim eee Jj l E pooma lt r 0 Limiter DC Filter Businterface NEXUS Busses 19 LI LI oop 5 XMIC 47 Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS TECHNICAL SPECIFICATIONS XMICo4 SPECIFICATIONS Inputs Channel configuration Subsonic filter Limiter Input level Phantom power Dielectric strength Frequency response Input impedance Input impedance CMR Gain THD amp N Dynamic range Idle channel noise Equivalent input noise level Crosstalk attenuation HF resistance A D conversion Latency Power supply Operating conditions Storage conditions Physical properties Table XMICO4 Specifications 472 Unless otherwise indicated all specifications are based on the following conditions All measurements comply with the IRT standards IRT Pflichtenheft 3 2 issued in July 1982 and IRT Pflichtenheft 3 5 issued in October 1990 and AES standards AES 17 issued in 1998 Ref rate 1 KHz Sample rate 48 KHz Full scale level 0 dBFS 24 dBu 8 channels per board balanced floating transformer isolation XLR 3 female gold plated contacts XLR 3 1 4 combo socket available on request or RJ45 port EN 50173 com pliant pinout for S STP CAT5 line or 25 pole D Su2. Fig Principle of true transformer isolation without a problematic input transformer Exceptional Dynamics The intrinsic noise of the XMIC input stage is 133 6 dBu A which is less than the noise pro duced by a 200 ohm resistance This value was determined at a source impedance of 0 ohm to en sure that the converter quality and not the con nected source is measured Complex measuring setups are required for determining those ex tremely low voltages to make sure that measuring errors due to external influence are largely ruled out Any stray pickup or even cable noise would affect the measurement Therefore the source im pedance must be located immediately on the shielded XLR input jack As the total noise level of the input stage and the converter is below that produced by an Ohmic resistance the noise floor produced by the micro phone impedance about 128 dBu depending on the actually used microphone predominates the overall signal Moreover the noise floor produced by the condenser microphone amplifier is not yet considered Thus the dynamic range achievable using the XMIC mostly depends on the intrinsic noise of the microphone used The maximum input level that board can handle without clipping is 24 dBu Such line signals can be directly applied to the XMIC a pad function as it is needed by other microphone amplifiers con verters is not required here The key specifications indicate a dynamic range of
3. 157 6 dB for the XMIC converter In theo The World of 24 Bit Digital Signals Depending on the standard used digital audio signals are transmitted with a word length of 24 bits AES EBU MADI or less In theory the 24 bit resolution provides for a dynamic range of about 144 dB As the XMIC s converter dynamics is much bet ter than that of the downstream digital medium the board provides a gain function The maximum adjustable gain is 70 dB The above theoretical approach of recording the unprocessed signal with full 32 bit resolution ry this range could be represented by a 28 bit res olution however the higher resolution of the XMIC converter also utilizes the noise produced by the input stage and the connected microphone for generating natural dither thus reducing the inev itable quantization noise to below the microphone noise That is the intrinsic microphone input stage noise masks the quantization noise within the useful signal RESULTING CONVERTER FEATURES e The dynamic range of the converter exceeds the respective values of any conventional microphones The 32 bit resolution covers the entire utilizable signal from the noise floor to the microphone clipping limit e Even very low levels are digitized with high resolu tion e Featuring a maximum input voltage of 24 dBu dB gain the converter can virtually not be overdriven by typical studio units Thus the XMIC can also be used as
4. 2010 06 05 Stage Tec ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS 5 MICROPHONE INPUT BOARD USER MANUAL 2 RNC HICH ODERT bint era I 2 2 1 N J a Stage Tec s newly designed NEXUS 8 channel microphone A D converter now digitizes analog input signals with a resolution of up to 32 bits It processes input levels of up to 24 dBu without clipping offering an outstanding dynamic range of 158 dB A This A D converter does not limit the microphone dynamics since the digital 32 bit sig nal includes the entire dynamic range of the mi crophone making gain adjustments or analog pre amplification of the microphone signal unneces sary If subsequent processing is performed at a lower resolution the control program allows for setting a digital gain of up to 70 dB The aim of providing optimum audio quality has been achieved thanks to Stage Tec s patented Stage Tec TrueMatch Technology The exceptional XMIC specifications could be achieved thanks to the TrueMatch principle a pat ented converter technology of the latest genera tion First class analog circuit design and state of the art DSP technology form the basis of these new reference converters Unlike conventional dy nami
5. Pin 8 Gh 4b Pin 13 Shield Pin 12 Ch 1b Pin 11 Ch 2b Pin 10 Shield Pin 9 Ch 3b Pin 8 4b Pin 7 ehleld Pin 6 Ch 5b f Pin 5 Ch 6b Pin 4 shield Pin 3 7b Pin 2 Ch 8b Ch 1a Pin 25 Ch 2 Pin 24 Shield Pin 23 Ch Pin 22 Ch 4a Pin 21 Shield Pin 20 Ch Pin 19 Ch Pin 18 Line a Tip Shield 17 Line b Ring Ch 7a 16 GAB Sleeve Ch 8a Pin 15 Shield Pin 14 Line a Pin 2 Line b Pin 3 GND 1 Pin 1 Ch Pin 2 Ch 5b Pin 3 Ch Pin 4 Gh 7b 5 Ch 7a Pin 6 6b Pin 7 Gh Pin 8 Ch 8b Fig XMIC pinout USER MANUAL XMIC 473
6. a fully adequate line input unit e Gain and signal processing settings are made on the digital domain after the A D conversion therefore not affecting the signal quality Because of their floating point arithmetic capabilities Stage Tec consoles can fully utilize the dynamic range so gain settings are made only with regard to the target medium and putting off the gain setting to the post pro cessing stage is hard to implement in practice due to the prevailing use of 24 bit formats In order to avoid this limitation highly dynamic signals might be recorded to separate tracks the unamplified converter signal goes to one track while another one Is fed from a split output of the same convert er configured with a fixed gain setting Depending on the signal level the alternative track can still be used for processing fortississimo or pianississimo signals NEXUS DIGITAL AUDIO ROUTING AND INTERCONNECT SYSTEM 2010 06 05 Stage ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN 2010 06 05 Stage ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN XMIC Split Out System Channel 1 USER MANUAL Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS Target Formats 16 bit target system Due to the provided gain function the converter can also be used for re cording to low resolution media For example when recording to a 16 bit machine the gain must be s
7. amic range 158 dB A 24 dBu typ THD amp N lt 0 003 24 dBu e Negligible converter inaccuracies e Optimized aliasing rejection e True galvanic isolation using transformers e Ultra low latency exceptional pulse fidelity e Auto mute function when connecting disconnec ting the microphone Ultra Low THD TrueMatch A D converters fea ture ultra low THD over a wide level range This wide range makes the use of TrueMatch convert ers uncritical Homogenous Noise Spectrum TrueMatch A D converters provide a homogenous noise spectrum over the entire conversion range The intrinsic noise is practically not perceptible even at very low input levels Significantly Better Aliasing Suppression Com pared to conventional techniques the TrueMatch technology provides significantly better aliasing suppression Crystal clear and transparent record ing is now ensured even at the usually slightly crit ical sample rate of 44 1 kHz XMIC 467 Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS Transformer lIsolated Input Stage Like all analog system inputs the XMIC inputs are transformer isolated and balanced offering true galvanic isolation The XMIC technology is in susceptible to magnetic fields and provides low ADC Board Businterface THD amp N at high output levels low frequencies in addition the input capacitance is very low and the board achieves optimum balancing NEXUS Busses
8. ards Stage Tec TrueMatch Delta Sigma converter Resolution 32 bit 218 times oversampling Sample rate 44 1 kHz 48 kHz 96 kHz system specific 395 us 48 KHz sample rate Voltage 4 75 5 25 V Current 1200 mA Temperature range 0150 C Humidity 90 max non condensing Temperature range 35 70 Humidity 90 max non condensing Appearance Board for 19 module frame 3 U 340 mm Front panel 4 8 HP 20 02 or 40 2 mm x 128 5 mm version specific Slot requirements 1 Weight 0 32 kg NEXUS DIGITAL AUDIO ROUTING AND INTERCONNECT SYSTEM 2010 06 05 Stage Tec ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN 2010 06 05 Stage Tec ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS PINOUT Various board versions with different port con used RJ45 ports have an EN50173 compliant wir figurations are available With standard ports XLR ing for information on special purpose solutions 1 4 the pinout complies with the respective such as D Sub ports etc refer to the figure be specifications so prefabricated cabling can be low XLR 3 1 4 Jack D Sub 25 Pin female 8 Ch Version female Rj45 Pinout to EN 50173 Pin 1 Ta Pin 2 Gh 16 Pin 3 2a Pin 4 Ch 3b Pin 5 Ch Pin 6 Ch 2b Pin 7 da
9. b port e Adjustable digital gain e 48 V phantom power Subsonic filter Phase inversion e Limiter fixed settings requires XCPU08 and Matrix5 software or later Switchable between 20 40 60 80 Hz 18 dB oct Threshold 0 06 dBFS Attack Time 0 samples Hold Time 10 ms Release Time Loe Ratio limit 24 dBu balanced max unbalanced input signal up to 24 dBu with phantom power disabled 11 mA max fused can be enabled disabled lt 200 V common mode signal with disabled phantom power 20 20 000 Hz lt 0 05 dB lt 0 1 dB typ 20 Hz 3 dB typ 18 dB oct slope below in compliance with IRT specifications 12 5 kilohm with phantom power disabled 6 4 kilohm with phantom power enabled 125 dB 50 Hz typ 105 dB 1 KHz typ 80 dB 20 KHz typ Up to 70 dB clickfree digital adjustment in 1 dB steps 0 003 24 dBu typ lt 0 004 granted 0 003 50 0 dBu typ lt 0 004 granted gt 144 dB RMS or gt 147 dB A limited by the 24 bit output format 157 6 dB A total range 155 5 dBFS CCIR RMS 0 ohm input impedance typ lt 129 5 dBu A 200 ohm input impedance lt 126 dBu RMS 200 ohm input impedance lt 133 6 dBu A 0 ohm input impedance lt 115 dBqp CCIR1K 200 ohm input impedance gt 140 dB 20 20 000 Hz gt 170 dB 1 KHz typ gt 150 dB 20 KHz typ HF demodulation resistant according to standards IRT Pflichtenheft 3 5 and European stand
10. c enhancement techniques such gain ranging TrueMatch does not switch between a number of conversion curves Typical side effects caused by switchover e g suddenly changing noise levels do not exist with TrueMatch convert ers Minimized Conversion Errors TrueMatch A D converters offer a permanent sample based cor rection resulting in a stable almost perfect con version curve with a minimum of errors over the entire conversion range TrueMatch technology The input stage is incorpo rated on the 32 bit converter while all other signal processes such as subsonic filtering phase inver sion clip limiting and gain settings are performed solely on the digital domain Each of the XMIC converters provides four split outputs with separately adjustable gain and sub sonic filters for different downstream consumers The XMIC s space requirements on the base device are exceptionally low The board which is just 3 U in height contains eight quality convert ers The board itself has a mounting depth of just 4 HP about 20 mm however the XLR standard ports require 16 HP Therefore in addition to the XLR unit versions featuring RJ 45 and D Sub termi nals with a footprint of just 4 HP are available for stationary installations Thus a single 3 U base may accommodate up to 160 of those quality mi crophone inputs XMIC e 8 channels on 3 U x 4 HP e Integrated split amplifier option e 32 bit TrueMatch converters e Dyn
11. ed with no extra processing Gain settings equalization and even the use of a subsonic filter can be postponed to the post recording stage Digital clipping spoiling recordings is now over and done with perfect for live recording live inter views and reports and theaters not to mention OB vans The recommended way of operation is to record the input audio directly to a hi resolution medium while not altering the original level All signal processing including level changes occurs in a non destructive way only after recording However as not all environments support this ap proach the converters include an adjustable gain function This can be set between 0 and 70 dB and is made on the digital domain too fixed settings attack time 0 samples responds at a level of only 0 06 dBFS so audio signals will not be affected at normal working levels v a wn 2S Fig Each of the eight XMIC converters offers four separate outputs with individually adjustable parameters XMIC 469 Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS The splitter function requires the NEXUS Matrix 5 control software or later 470 The XMIC is the first unit incorporating a split ter directly on the board The converted signal is forwarded via four separate outputs to the NEXUS TDM bus and can thus be made available to four different consumers Signal processing is made in divid
12. et appropriately to utilize the limited 16 bit dy namic range of in theory 96 dB Usually very lit tle or no headroom at all will typically be set dur ing recording to optimally utilize this low resolu tion 16 bit formats make sense only for creating consumer target formats however the conversion should be the last step in the process Creating 16 bit recordings for serious post processing is basically questionable 20 bit target system 20 bit resolution pro vides a dynamic range of 120 dB Gain is less criti Processing on the Digital Domain The combination of extensive dynamics and the converter principle allows for moving all sig nal affecting filtering typical of microphone preamps to the digital domain For example sub sonic filters 20 40 60 or 80 Hz 18 dB oct can be accurately computed and precisely applied since they are not contained in the sensitive ana log part of the signal path they do not cause any audio deterioration Limiter To avoid clipping of amplified signals each splitter output features an extra on board limiter that can also be disabled This ultra fast limiter Perfectly Integrated Splitter Function cal here There is still an effective dynamic range of 100 dB even at a headroom of 20 dB 24 bit target system When using 24 bit resolu tion the resulting dynamic range of 144 dB al ready exceeds the dynamic range of the micro phone The signal fed from the microphone can be record
13. lean OR opera tion Naturally this setting will affect all work places even the audience as well as your speakers The XMIC puts an end to this problem An intelligent circuitry detects whenever the connector is insert ed or removed and mutes the signal for an instant e XAD 8 channel version 24 dBu input level e HXAD 8 stereo converters 4 XLR ports 3 pole female for inputs 1 4 the inputs 5 8 same configuration are AUSF HRUNGEN XMIC located on a separate front panel XMIC RJ 2 RJ45 ports for all channels XMIC DSUB 25 pole D Sub port Optionen Adapter RJ45 XLR ports The RJ45 ADP adapter PCB is available for connecting signal sources requiring XLR The 8 HP front panel of the board includes four XLR ports for inputs 1 to 4 A second front panel offers inputs 5 to 8 and can be installed for example in a reasonably priced base device row without a backplane just below or above the row containing the XMIC With the D Sub and RJ versions designed for stationary installations all inputs are contained on a 4 HP front panel Instead of simple XLR ports XLR 1 4 combo ports are implemented on request Table XMIC Versions and Options TrueMatch RMC The XMIC microphone input board is not only used on the NEXUS routing system but is also im plemented on the 24 channel TrueMatch RMC making the outstanding audio quality available to other applications There is also a line input ver sion of this
14. standalone converter device based on the XAD A D converter board by Stage Tec Exist ing even analog installations can be easily ex tended and upgraded Remastering The TrueMatch RMC converts the analog output signal of a multitrack recording ma chine This high quality digital signal is then stored with a resolution of 24 bits to a modern storage device Music Production The simple converters used in numerous cheap digital mixing consoles are by passed by an upstream TrueMatch RMC Live Recording Thanks to its compact size the TrueMatch RMC can be used on the spot The sensitive analog microphone signals are connect ed via very short lines NEXUS DIGITAL AUDIO ROUTING AND INTERCONNECT SYSTEM 2010 06 05 Stage Tec ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN 2010 06 05 Stage Tec ENTWICKLUNGSGESELLSCHAFT FUR PROFESSIONELLE AUDIOTECHNIK MBH BERLIN Stage Tec PROFESSIONAL DIGITAL AUDIO ROUTING AND MIXING CONSOLE SYSTEMS Block Diagram 48V Channel 1 6k8 Pin2 i Ae Pin3 Pini 48V Channel 8 d Pin2 D Eisi Pin1 XMIC 8 Channel Microphone ADC Fig XMIC schematic diagram JUMPERS AND TERMINALS The PCB does not incorporate any jumpers or terminals relevant to the user Circuit Board USER MANUAL
15. ually for each of those paths Of course the signal can still be made available to other consum ers using the standard crosspoint routing In the past the various consumers of a micro phone source had to agree upon common settings for converter gain and filters For example chang ing the gain at one workplace affected all consum ers Changes were possible only using the internal processing functions of the console or by mutual agreement Now using the XMIC the FOH engi Auto Mute It is sufficiently known that the microphone should not be physically connected to or discon nected from the input jack while the fader is open Nevertheless this happens every day affecting the hearing of your colleagues and sometimes Variant Types Stage Tec offers the following A D converter variants Versions and Options The following XMIC types are available neer can make other gain and filter settings than the monitoring engineer or the operator in the OB van In systems where NEXUS user rights are imple mented the displayed inputs can be restricted so every workplace only accesses its sources Each of the eight converters on an XMIC sup ports the splitter function so the entire board of fers 32 outputs That is NEXUS matrix windows show 32 items The four splitter outputs of the in dividual converters have the A D extensions Note Phantom power can be enabled or dis abled from each workplace Boo
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