USER'S MANUAL - Dynaudio Professional
Contents
1. Mains Power Supply Power Consumption Warranty Parts and labor 5 5 x 2 5 x 6 9 140 x 64 x 176 mm 1 8 Ib 0 82 kg Acrylic and anodized aluminum front panel Plated and coated chassis Rubber coated side plates 1 LED per stereo channel activated at 60 dBFs 12 LEDs per channel 12 VDC 84W 1 Year Due to continuous development these specifications are subject to change without notice 21 tc electronic2. 18 dB attenuation in the analog and digital speaker signal paths This function extends the dynamic range and lowers distortion for the analog outputs 9 CUT POWER OFF Button Pressing this button mutes the speaker outputs but not the phones Hold CUT for more than three seconds to power off the unit 12 10 PHONES Knob The PHONES knob controls the headphone output unless BMC 2 is in Ref mode When Ref mode is pressed speaker and headphone outputs operate at calibrated level rather than the level set by the Speaker and Phones pot 11 STEREO MONOI SIDE Toggle Button Pressing this button toggles between Stereo Mono and Side monitoring From a signal flow point of view both operations happen after the speaker gain control E The unit always powers up in Stereo mode ZA regardless of the mode selected when it was shut off Monitoring the side component only is especially interesting when comparing a data reduced format such as MP3 or AAC to a linear signal or to a data reduced signal at a different bit rate 12 VALID LED When the VALID LED is lit the big volume Rotary Control is in the signal path When it is not lit you are listening at REF level see 6 REF Button for more information 13 METERS The Level Meters show the precise sample peak level of the input selected without any gain changes If Mono or Side monitoring is selected the left LED bar shows the Mono comp
3. converters or by clicks and dropouts due to interface breakdown A steady digital clock is crucial to the sound quality especially when one of the above conversions is performed The clock stability and jitter rejection of BMC 2 is based on technology from TC System 6000 providing a performance strikingly better than equipment many times the price of BMC 2 The excellent jitter rejection of BMC 2 is also capable of cleaning up a less than perfect digital signal from an external source thereby tidying up your entire studio timing and optimizing performance 14 BMC 2 Design Philosophy In the design of BMC 2 it has been important to provide constant control of your speakers regardless of the state of your computer or other signal sources Another criterion was not to touch the signal unless necessary Consequently BMC 2 features a synchronous design with bit transparent handling impressive jitter rejection and a sample rate generator with a memory lock function that is invoked should the clocking input fail The XLR outputs have been optimized for both balanced and unbalanced operation When buying or soldering XLR to TRS adapters please follow the wiring diagram on the following page to take advantage of hum and noise suppression even in unbalanced mode One important feature of the BMC 2 is that it can avoid noise when switching between different sample rates But thanks to the sample rate memory lock BMC 2 can even h
4. BMC 2 JET CLOCK DAC 8 MONITOR CONTROL A A USER S MANUAL INTRODUCTION Table of Contents Introduction SETUP EXAMPLES Setup Example OPERATION Overview Rear Panel Overview Top Operation TC Electronic Sindalsvej 34 DK 8240 Risskov info tcelectronic com English Version TABLE OF CONTENTS APPENDIX 2 and Jitter Rejection 14 BMC 2 Design 15 Wiring 16 Calibrated Listening 18 Technical Specifications 19 Manual revision 1 0 SW V 1 0 3 Prod No E60516011 INTRODUCTION BMC 2 is a dedicated Digital to Analog Converter and high quality hands on Monitor Control that s an ideal solution for you whatever your audio production or monitoring setup be it digital or analog We at TC Electronic realize that predictable speaker and headphone control is an important part of your production process and with BMC 2 such luxury is always available to you regardless of the state of the computer at the heart of your system This handy self contained desktop unit can be operated without a Mac or PC offering you instant and practical control of sound levels As well as controlling the listening level BMC 2 allows you to switch between three digital input sources S PDIF AES3 TOS and ADAT and conf
5. SPDIF ADAT or be activated once the REF button is pressed TOS button in the Input Select section INPUT SELECT The factory default setting for REF preset gain is 18 dB SPDIF E You can calibrate both sets of speakers ADAT ZA independently but headphones calibration occurs every time a new REF level is set TOS 7 ALT Button After selecting the desired input press and hold ALT stands for Alternative Monitors The ALT function ALT allows you to cross fade analog speaker outputs and At first the format previously assigned to ALT is lit ALT outputs the default ALT output is SPDIF AES3 After approximately five seconds the newly assigned format will blink Do not release the ALT Per default the ALT function is assigned to the button until the LED is lit steadily again SPDIF AES3 out However you can choose to assign The new output set is now assigned to the ALT it to or TOS instead using the method described function below II OPERATION To calibrate levels for the ALT speakers Press the ALT button With REF disengaged LED unlit set the desired level using the Rotary knob and the headphone level control Press and hold the REF button for approximately five seconds until the meters flash Once the meters are lit steady again the new level has been set Please refer to section 6 REF for additional information on calibration 8 DIM Button The DIM button toggles an
6. andle an input clock that is coming and going APPENDIX BMC 2 continues to run at the last measured clock rate when your Airport Express or other feeding device may think it s time to sleep We try to treat your speakers as gentle as possible so if you remove power from BMC 2 ungracefully by pulling the power instead of switching it off all you hear is a minor anomaly There is one thing beyond our control however If you attach digital speakers and switch between sources at different sample rates it depends on these speakers whether noise occurs during switching or not It is down to how the speaker handles a change of sample rate while it is active 15 APPENDIX WIRING DIAGRAMS In setups where the BMC 2 balanced outputs are connected to unbalanced equipment it is possible to suppress noise by using a cable wired as illustrated below PIN 2 EM w m PIN 3 E ESS Im i PIN 1 Wiring for connecting the BMC 2 s balanced XLR outputs to unbalanced equipment with 1 4 input jacks 16 APPENDIX WIRING DIAGRAMS When you are feeding an AES3 signal to the SPDIF AES3 input of the BMC 2 or when you are feeding another device s AES3 input from the SPDIF AESS output of the BMC 2 we recommend placing a small circuit between the units to ensure optimal cable length and signal integrity These circuits are not supplied by TC Electronic please contact a qualified technician for assistance BMC 2 Out
7. avoiding accidental squashing of the mix in a misguided search for extra loudness Furthermore Calibration makes the spectral balance of 10 a mix more predictable because we aim at different spectral targets when reproduction level changes Calibration is typically performed using pink noise at a defined level e g 20 dBFS RMS With an SPL meter reading slow C weighted set the level at your listening position to a certain SPL per speaker Typical values would be between 70 and 85 dB SPL depending on the application The REF button removes the Rotary Control 1 from the speaker signal path and assigns a preset gain SPL calibrated speakers to the analog speakers and the speakers assigned to ALT When you press REF the meters momentarily show the preset gain assigned to speakers L and headphones R before resuming normal operation To calibrate analog speakers and headphones With REF disengaged LED unlit set the desired level using the Rotary knob and the headphone level control OPERATION Press and hold the REF button for five seconds Assigning ALT to a digital output of your choice until the meters blink Do not release the REF First disengage ALT ALT is disengaged when the button until the meters are lit steadily again ALT button s LED is not lit Now select the digital output format you would like If you prefer you can also program the DIM function to to assign ALT to by pressing the
8. chnology TCAT DICE JR gt 3 dB 10 Hz gt 100 dB 600 Hz 1 ns peak BW 700 Hz to 100 kHz lt 42 ps RMS BW 100 Hz to 40 kHz 0 596 of Sample Period 0 15 0 3 ms DC to 23 9 kHz 0 01 dB 48 kHz XLR balanced with ground sensing 100 Ohm 13 dBu 5 dBu DIM activated Off to 12 dB lt 93 dB 0 002 1 kHz 1 dBFS 0 dB gain 7 118 dB 121 dB a weighted 20 Hz to 20 kHz 0 0 2 dB 20 Hz to 20 kHz 98 dB 20 Hz to 20 kHz DAC D to A Conversion D to A Delay Headphones Output Connectors Impedance Max Output Level Digital gain THD Dynamic Range Freq Response Power 40 Ohm Load Power 600 Ohm Load EMC Complies with Safety Certified to Environment Operating Temperature Storage Temperature Humidity 24 bit 128 x Oversampling Bitstream 0 40 ms 0 20 ms 48 kHz 96 kHz 1 4 Phone Jack Stereo 80 Ohm 20 dBu no load Off to 12 dB lt 85 dB 0 006 1 kHz 1 dBFS 0 dB gain 300 Ohm 7 102 dB 20 Hz to 20 kHz 0 0 2 dB 20 Hz to 20 kHz 200 mW 93 mW EN 55103 1 and EN 55103 2 FCC part 15 Class B CISPR 22 Class B IEC 60065 EN 60065 UL60065 and CSA E60065 CSA FILE LR108093 32 F to 122 F 0 C to 50 C 22 F to 167 F 30 C to 70 C Max 90 non condensing TECHNICAL SPECIFICATIONS General Dimensions W x H x D Weight Finish Signal in Meter all digital inputs Stereo PPM Bridge Stereo MONO SIDE
9. ers Active speakers with Digital In Analog In AwTMOS eur ur RIGHT PRONES POWER DIGITALINOUT wowrgoumzs GY tc electronic T m SPDIF AES3 SETUP EXAMPLE OVERVIEW REAR PANEL Power In Analog Outputs SPDIF I O Use the supplied 12V DC Balanced analog outputs for 24 Bit SPDIF AES3 id input and output on power supply active monitors amplifier or mixer RCA connectors MONITOR OUTPUT DIGITAL IN OUT LEFT SPDIFIN OUT TOS IN OUT ADAT IN PHONES C SPDIF OUT DESIGNED AND pata DC 0 7A E NIS AES3 id 75 Ohm TRONIC Phones TOS amp ADAT 1 4 jack connection for headphones Lightpipe inputs and outputs on standard TOSLINK connectors TOS Channels 1 2 ADAT Channels 1 4 INPUTS SPDIF ADAT 3 4 TOS a 1 2 LOCK SIG INPUT SELECT EM SPDIF eam ADAT SEL STEREO MONO SIDE OVERVIEW TOP OPERATION 1 Rotary Control The Rotary Knob is always active unless Ref Level or Cut is enabled The Valid LED and the dot in the knob itself are lit when it is active The markings on the panel around the knob follow half hour readings on a clock According to these markings the control has the following defined gain distribution Min Off 1st step 72 dB eee 9 o clock 42 dB P from here each half hour V W division equals 4 dB UE 12 o clock 18 dB from he
10. irm if those inputs are synchronous or not BMC 2 drives one set of analog speakers one set of digital speakers and a set of headphones Calibrated listening is available with both sets of speakers and the headphone output But it s not all about DAC and Level Control BMC 2 also puts user definable reference levels at your fingertips You simply hit the front panel mounted REF button and BMC 2 4 will attenuate the output to a user defined sound pressure level so reference level monitoring is always just a single button press away BMC 2 precision re clocks all inputs and features high performance jitter rejection based on patented JET technology that was originally developed for our flagship System 6000 You get all the benefits of optical interfacing without the problems asymmetries are corrected and jitter is completely removed from the equation The analog outputs offer wide dynamic range on XLR connectors Peak level metering and Integrity Check or iCheck is also available on the selected input iCheck reveals if the signal is spatially compromised e g because of data reduction such as MP3 or AAC encoded at too low a bit rate BMC 2 is a self contained desktop unit that works right out of the box with no need for a computer for setup It interfaces directly with all new Macs and most PCs used for audio production just attach the supplied 12V DC power adapter tc electronic METERING Active speak
11. on shows how material with a low dynamic range ends up loud when level control is based on peak level measuring as it used to be Now with loudness detection principles moving into consumer electronics iTunes Dolby etc and broadcast the loudness advantage of squeezed is disappearing leaving only distortion and a wimpy sound Calibrated monitoring with BMC 2 on the other hand ensures consistent listening conditions enabling you to always deliver reliable results in the studio no matter what the target format and audience 19 TECHNICAL SPECIFICATIONS Digital Inputs and Outputs Connector S PDIF AES3 id compatible Formats S PDIF and TOSLINK Connector ADAT or TOSLINK Format ADATG Digital IO Engine Clock and Jitter Internal Sample Rate fallback External Sample Rates Jitter Rejection Engine Jitter Rejection Filter 4th order DIO Interface Jitter DA Conversion Jitter Output Phase all digital outputs Processing Delay DIO 96 48 kHz Frequency Response DIO Line Output Channel 1 2 Connectors Impedance Max Output Level Digital Gain THD Dynamic Range incl DIM Freq Response Crosstalk 20 RCA Phono BNC adapter included 75 Ohm 1 Vpp terminated S PDIF 24 bit IEC 958 Pro status bits Optical Pipe Ch 1 to 4 48 kHz Ch 1 to 4 SMUX 96 kHz TCAT DICE JR handling all IO formats 48 kHz 43 to 97 kHz jitter rejection at all rates JET te
12. onent while the right LED bar shows the Side component Both speakers however reproduce either Mono or Side depending on the setting As BMC 2 handles digital input signals only and subse quently cannot be above 0 dBFS the O L indicators cannot be triggered by the input signal If they do light up it is due to an internal overload OPERATION Internal overload can occur when a high input level is present and the Rotary Control Knob or the Headphones control is set above 0 dB 43 o clock position at the same time If the O L indicators are lit reduce the Rotary volume control or the Headphones control accordingly External Metering ZA When using an external loudness or level meter in connection with BMC 2 it is essential that the big ROTARY CONTROL knob is not present in the signal chain Therefore external metering should be done using a digital output which is not assigned to ALT see 7 ALT button The outputs not used for ALT bit transparently pass the signal from the selected input as it is required for an external meter APPENDIX BMC 2 Clock amp Jitter Rejection A digital audio signal relies on only two components level and time We all know about levels bits but timing is equally important to avoid noise and distortion Jitter is unwanted variation of a digital audio signal s timing It is typically recognized by compromised dynamic range of AD DA and sample rate
13. put to AES3 Input 62 Ohm BMC2 Signal ee Hot AES3 id M ET essi ous ee 75 Ohm BNC Ground O Cold e o Shield Note Place this circuit close to the 53 input on the target device AES3 Output to BMC 2 Input 56 Ohm Hot o W Signal AES3 OUTPUT 56 Oh 2 AES3 id m 1100hmXLR Cold w 200 input 75 Ohm BNC Shield o Ground Note Place this circuit close to the BMC 2 input 17 APPENDIX CALIBRATED LISTENING Correctly calibrated REF level is essential for mixing Audio for different audiences requires different ranges in dynamics please refer to the left hand illustration below Without calibrated listening in the studio you won t be able to judge the dynamic range of a program track reliably Dynamic Range Tolenrance o ofatypical audio consumer 24 4 Headroom Preferred Average Noise Floor 12 6 18 o dB 24 E E 239 oO 12 36 18 42 E o e i 274 iS on E 54 E Headroom peak E Wl Preferred Average Noise Floor 36 22 60 Peak Level Normalization as 66 Narrow Dynamic Range Loud 42 18 APPENDIX CALIBRATED LISTENING Some engineers apply squeeze box tactics because of the popular wisdom that this will produce the loudest result The red line in the right hand illustrati
14. re each half hour division equals 3 dB di 3 o clock 0 dB che Max 12 Every pot has a slightly different transfer function so the above numbers are guidelines only A more precise way of knowing the gain is to check the LED dot on the knob which briefly blinks at each 6 dB increment This blinking occurs when the gain is within 0 2 dB of a 6 dB increment To ensure a bit transparent 0 dB setting at 3 e o clock the control snaps to 0 0 dB in a slightly larger area around the 0 dB point Unless the ALT button is enabled the Rotary Knob controls the analog L R monitor outputs With ALT selected the analog outputs are muted and the Rotary Knob sets the output level of the digital output assigned to ALT see also section 7 ALT Per default ALT uses the SPDIF AES3 output 2 INPUT SELECT Buttons The INPUT selectors determine which input source is fed to the speakers phones coax S PDIF TOS and ADAT outputs of the BMC 2 When switching between synchronous input sources BMC 2 performs the operation as a cross fade without muting In case the input sources are not synchronous or even at different sample rates a small period of muting can be expected during switching Note that input sample rates may well be identical without being synchronous BMC 2 constantly monitors and indicates if inputs are synchronous to the one currently selected When the LOCK LEDs are lit steadily
15. this indicates that the input signals are synchronous When the LOCK LEDs blink this means inputs are not synchronous Any selected input format is passed bit transparently to all digital outputs with the exception of the output that is assigned to ALT OPERATION 3 INPUT STATUS LEDs The LEDs in the left column indicate that a signal is recognized The LEDs in the right column indicate that an audio signal is present on that particular input INPUTS SPDIF ADAT TOS INPUT SELE Signal present ENPUT SELE Signal recognized 4 ADAT SEL Button This button has two functions Selecting ADAT Channel Pairs Press the ADAT button briefly to switch between ADAT channel pairs 1 2 and 3 4 Channel pairs 5 6 and 7 8 are not available OPERATION Selecting ADAT Sample Rate As ADAT double sample rate format is not detected automatically you must select this manually if required Press and hold the ADAT button for approximately 3 seconds to select double sample rate 88 2 or 96 kHz When double sample rate is selected the yellow x2 LED is lit CLOCK ACR 441 48 x2 ADAT SEL 5 CLOCK STATUS LEDs The CLOCK STATUS LEDs indicate the sample rate of the currently selected input When the yellow x2 LED double sample rate is lit the 44 1 LED represents 88 2 kHz and the 48 LED represents 96 kHz 6 REF Button Calibrated level listening makes it easy to move from studio to studio
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