DCN28 User Manual
Contents
1. Ground Sound Audio Products Digital Crossovers Amplifiers Power Supplies DCN28 Stereo Digital Pre Amplifier Digital Crossover User Manual Ground Sound ees True Performance Audio Product for High End Listening www groundsound com 1 Product of Denmark Ground Sound DCN28 Manual Warranty DCN28 is warranted against defects in components and workmanship for a period of two years from the date of purchase During the warranty period Ground Sound will at it s discretion either repair or replace the product which prove to be defective provided that the product is returned shipping prepaid to an authorised Ground Sound dealer or to the Ground Sound address Defects caused by unauthorised modifications misuse negligence nature or accident or any use of this product that is not in accordance with the instructions provided by Ground Sound are not covered by this warranty This warranty is exclusive and no other warranty is expressed or implied Ground Sound is not liable for consequential damages from the use of DCN28 and the supplied software XOverWizard II advanced Safety To prevent the risk fire or shock hazard do not expose the unit to rain or excessive moisture To avoid electrical shock do not open the unit as there are no user serviceable parts inside To prevent damage to the unit do not expose the unit to excessive heat To prevent damage to the unit ensure that the AC mains outlet voltage is2. 8Q Output Power 4Q Minimum Load Impedance Note Bass Amplifier Model Class Type Output Power 8Q Output Power 4Q Minimum Load Impedance Note Sub Woofer Amplifier Model Class Type Output Power 8Q Output Power 4Q Minimum Load Impedance Note Other notes about drawing of my system www groundsound com Product of Denmark 15 Ground Sound DCN28 Manual Initial setup After all connections have been done it s recommended to make a simple test setup in the XOverWizard II software and upload it to DCN28 to see if all drivers amplifiers and DCN28 do as supposed to Example If your system is 3 way stereo fully active you probably have 3 stereo power amplifiers connected with one amplifier to a pair of dome tweeters one to a pair of 6 5 mid ranges and finally one to a pair of 10 basses Then make and upload a setup with crossings at 2 5kHz and 150Hz Check at low volume that the tweeter in each side really plays the high frequencies that the mid plays the band pass range and finally the bass plays the lowest frequencies Also check that each range is in phase by listening from a center position and that the sound seems as it s coming from between the loudspeakers with adequate bass level Now that you know that everything is working correctly you can proceed to make the real setup with measurements etc in the XOverWizard software Hint When you have measured the system and made the real set
3. Info displays input and preset on DCN28 lt Mute On Off X over speaker symbol ENTER 0 wu PHILIPS Optional remotes You can find DCN28 IR codes for Logitech Harmony universal remotes in their on line data base www groundsound com 6 Product of Denmark Ground Sound DCN28 Manual Back Panel Clip Clip LEDs will flash in the event that the analogue input is overloaded and you have to lower the output of the analogue source to avoid digital clip The sensitivity is optimized for normal outputs of 2Vrms and therefore there is normally no need to do anything Input 1 amp Input 2 The analogue input connectors are true balanced Neutrik XLR and according to standard pinl GND pin2 non inverted and pin3 inverted If a singled ended source with RCA is used you have to use an adapter or an adapter cable which shorts pin3 to pinl GND Optional a resistor of 100Q can be used instead of the short See Ground Sound web FAQ for more info http www groundsound com faq php TOS 1 amp TOS 2 Digital optical input with standard TOS link connector Maximum sample rate for optical sources is 96kHz AES EBU Digital balanced input with XLR connector The input is transformer coupled and loaded with 110Q S PDIF Digital S PDIF input with RCA connector The input is transformer coupled and loaded with 75Q Audio USB Direct digital audio streaming from PC MAC Non driver installation is needed Max 48kHz 16 bit Program
4. _ch 1 144 24dB norm rev Hz Q dB Hz Q aB 1 2 order dB 1 2 order Output Processing Block 2 maximum 20 biquads Gain Phase Delay LowPass PEQ Notch 144 24dB normirev 0 60ms Hz Q dB Hz Q Output Processing Block 3 maximum 20 biquads Gain Phase LowPass PEQ Notch 144 244B norm rev Hz Q dB Hz Q Output Processing Block 4 maximum 20 biquads Gain Phase Delay LowPass PEQ Notch 144 244B norm rev 0 60ms Hz Q dB Hz Q Output Processing Block 5 maximum 20 biquads Gain Phase LowPass 144 24dB norm rey Output Processing Block 6 maximum 20 biquads Gain Phase LowPass PEQ Notch 144 24aB norm rev Hz Q dB Hz Q Output Processing Block 7 maximum 20 biquads Gain Phase Delay LowPass PEQ Notch 144 24dB normirev 0 60ms Hz Q dB Hz Q Output Processing Block 8 maximum 20 biquads Gain Phase LowPass PEQ Notch 144 24aB normirev Hz Q dB Hz Q This is an overview of how the processing is setup in the DSP of DCN28 You will be more familiar with the possibilities of the DSP when you begin using the XOverWizard setup software DCN28 signal processing LowShelv ch 2 dB 1 2 order LowShelv ch 3 dB 1 2 order Input A Processing maximum 10 biquads Input A PEQ Notch Hz Q dB Hz Q Input B Processing maximum 10 biquads Input B PEQ Notch ighShe LowShelv Hz Q dB Hz Q 2 4B 1 2 order 24bits 96kHz LowShelv Ch 4 dB 1 2 order Notch Hz Q LowShelv ch 5 dB 1 2 orde
5. within the specified range of the purchased unit If the unit is connected to wrong type of AC mains it may result in damage to the unit Always turn DCN28 and associated equipment off before connecting or disconnecting any cable to the equipment as you may unwillingly damage either DCN28 or the associated equipment Equipment connected in the audio system requiring grounding must be grounded to the same ground point as DCN28 Unplug this product during lightning storms or when unused for long periods of time Failure to observe these warnings can result in damage to DCN28 or associated equipment and will not be covered by warranty Caution Damage may be the result to your speaker drivers and other equipment if your audio system is connected incorrectly or if DCN28 is used incorrectly Read this manual in full before configuring the hardware and review driver specifications to ensure correct operating conditions and other relevant information of associated equipment If you are in any doubt please seek assistance from Ground Sound dealer distributor or contact Ground Sound direct active groundsound com Cleaning the front If the front panel needs to be cleaned use a soft cloth if necessary use a very small amount of lukewarm water and a drop of mild non abrasive detergent like dish wash detergent DO NOT USE ANY ketones aromatics esters halogens window cleaning sprays alcohol kitchen scouring compounds solvents acetone
6. 1 26 Revision C 2011 03 02 Revision D 2012 10 17 Revision E 2014 10 18 www groundsound com Minor text edit Start Up Volume in Encoder menu amp new Remote SRT8215 Minor text edit Minor text edit 12 Product of Denmark 15
7. benzene gasoline carbon tetrachloride thinners or ammonia based cleaning solutions on the LED display window it will be damaged www groundsound com 9 Product of Denmark 5S Ground Sound DCN28 Manual Unpack Congratulation with your new true performance Digital Crossover Preamplifier unit and thank you for buying this Ground Sound product Please check visually for shipping damage In the event of any visual damage immediately contact shipping company and sales office at Ground Sound dealer distributor or Ground Sound What s in the package 1 unit DCN28 Digital Crossover Preamplifier 1 USB dongle key with Lanyard for XOverWizard II advanced software 1 unit Philips SRT8215 pre programmed IR remote control 1 USB A male USB B male cable 5m Installation The installation depends upon the final setup and it s highly recommended to plan this carefully after reading the whole manual For convenience a Planning of my system sheet is included in this manual simply print the Planning of my system page and plan the hardware connections before any programming is done page 9 DCN28 comes with a factory setup with full range output from A to output 1 4 and B to output 5 8 Don t test the system full range at too high volumes on unfiltered tweeters you will likely damage the tweeter If you want to test the system before running any measurements it s recommended to make a simple crossover setup in the XOverWiza
8. fore the welcome text comes DCN28 has a standby mode and you can go into standby mode by pressing the encoder button for about 1 second or via the IR remote control To turn on from standby mode you also have to press the encoder button for about 1 second or select an input source via the remote control In standby mode all remotely switched power amplifier are also switched off At power on from standby mode or from OFF the remotely switched power amplifiers are turned on sequentially with a interval of about 1 5 seconds to prevent house fuse from blowing tripping www groundsound com 4 Product of Denmark DCN28 Manual Menu of Encoder Button The encoder button on the front panel controls all functions of the DCN28 by pushing and turning the button The display will show the volume of the output when there are no activities The display will return to volume from other menu displays after 3 seconds without any activity e e bd e Pe seee eoeeeee eeeeeee e eseee e o e e Volume value is shown default e eeeeeoe Input source selection Push V lt 4TumP Analog 1 Analog 2 TOS 1 TOS 2 AES Coax USB opoo ee ose oote P seesee ese eeees ooo eeee eee oe sees 220e0 eee soo eees Seeeee eeee2 Push V lt TurnP gt Preset 1 2 3 4 seesese e sooo Brightness Off Low Normal High Push V lt dTurn gt Off Low Normal High pd oee
9. lution up to 24 bits THD Noise less than 0 003 Dynamic Range 140 dB typical Transformer coupled coaxial input RCA connector Coaxial input load impedance 75Q Transformer coupled AES EBU inputs Neutrik gold XLR 3 pol female connector AES EBU input load impedance 110Q Optical TOS link input Standard type Toshiba connector Soundcard input Supports sample rate 32kHz 44 1kHz and 48kHz Supports 16 bits data word Standard driver No driver installation is needed Fully isolated from the rest of the units electronics with Analog Device coupler USB B male connector DSP internal IIR processing 76 bit internal resolution 96kHz sample rate Configured with 2 input processing blocks of 10 biquads each Configured with 8 output processing blocks of 20 biquads each Latency input output approximately Ims USB programming interface Requires FTDI driver www ftdi com Fully isolated from PC USB B male connector Power amplifier triggers 4 pcs 12V DC trigger outputs max 100mA 2 5mm DC plug tip ring Mains 230 VAC 8 30 Watts maximum 3 pin IEC type C14 2 internal fuses 315mAT amp 100mAF 5 x 20 mm Dimensions and Weight 100x 430 x 290 mm Netto weight 5kg Total shipping weight 7kg www groundsound com 11 Product of Denmark E Ground Sound DCN28 Manual Remarks and Revision history Ground Sound reserves the rights to make alterations without prior notice Revision A 2010 07 07 Revision B 2011 0
10. ming USB Connection for programming of setups Driver is required see previous chapter how All tree LEDs will flash when programming is in progress If there is no valid program stored or it is corrupted the upper LED will be lit constantly Outputs 1 8 Analogue outputs with male Neutrik XLR connectors and according to standard pin GND pin2 non inverted and pin3 inverted If the connected power amplifier only has singled ended RCA input you will have to use an adapter or better an adapter cable IMPORTANT NOTE make sure that the inverted output pin3 is NOT shorted to GND pin1 You might damage the output buffer in DCN28 For clarification It is not necessary to terminate the inverter pin3 output with any load this is an output and there is no reason to load it when not used neither short it Amp Trig Remote 12Vdc output for switching power amplifiers with trigger input Maximum 100mA per output Connector is 2 5mm DC plug with positive in center and negative on sleeve ordinary thin wire can be used Serial Here is the unit s serial number Be alert and contact Ground Sound if this is removed when buying second hand Mains IEC Mains power inlet 230Vac 50 60Hz Mains ground pin is connected to chassis www groundsound com 7 Product of Denmark amp Ground Sound DCN28 Manual Processing Blocks in DSP Output Processing Block 1 maximum 20 biquads Gain Phase LowPass PEQ Notch HighShely_ LowShelv
11. oooe seesee pd eeee 60000 ooo ooo o e oo ob e E oe see ose see OSeoee e LEETE e eee00e0 e eeceese oeeo kd 4 oeeeeee 3 esesse as L fod addy dus ee ee J 28800 o e e 26000 SESES 2000 20066 2 pd ooooo see 99000 ooe e 4 e e eooo e e s e006 e eee 3 pd OOSRSER e e eee PPOBEED oe eoeeeee sece otoo gesssee e e e Output 3 muted Push V Turn to blink the individual channel Push V to mute enable Turn lt all counter clock no channel blinking to return to menu 000800 e e esre goocese Push V lt Turn to blink the individual channel Push V to blink value and lt dTurn gt to change value 2 eeetese 2 Push V lt dTurn to edit Start Up Volume Push to blink value and l lt Turn to change value Returns to Volume eee SOSSeoe Soee LAL LL eo e www groundsound com 5 Product of Denmark Ground Sound DCN28 Manual Philips SRT 8215 IR Remote LCD Screen lt lt lt lt Standby age Analog 1 Analog 2 TOS 1 TOS 2 ____Home____ AES Coax Devices Activities Page 2 Fa Watch TY USB Sample Rate ax Listen to music Preset 1 Preset 2 Preset 3 Preset 4 Mh waren a movie To change LCD screen page Page 3 ae a A yv Brightness Up PRESTIgO Brightness Down volume Uplowns lt Input source toggle Up Down lt
12. r LowShelv ch 6 4B 1 2 order dB 1 2 order LowShelv Ch 7 dB 1 2 order LowShelv ch 8 4B 1 2 order 4B 1 2 order Hardware Block Diagram Burr Brown ADC gt A E J Digital Audio Receiver amp W W VYYYYYYY Burr Brown ae W W Out 2 W W 4 N 0a gt Burr Brown Out 3 8 channel Digital E o p AORO oo Out 4 Controlled Analogue Attenuator W W W Out 5 W W Out 6 W ode g OxO a aA D aa W Sample Rate Converter AES EBU W W W Burr Brown Out 7 Coax gt DAC gt gt gt USB Audio CH 8 SS eS Out 8 Programming A simplified overview of the internal signal flow through DCN28 www groundsound com 8 Product of Denmark Ground Sound Planning of my active system Channel Tweeter Model Impedance Sensitivity Max Power Frequency Range Note Channel Mid range Model Impedance Sensitivity Max Power Frequency Range Note Channel Bass Model Impedance Sensitivity Max Power Frequency Range Note Channel Sub Woofer Model Impedance Sensitivity Max Power Frequency Range Note DCN28 Manual Tweeter Amplifier Model Class Type Output Power 8Q Output Power 4Q Minimum Load Impedance Note Mid range Amplifier Model Class Type Output Power
13. rd II with the approximately expected crossover points and slopes Important note It s also very important to turn off system sound on the PC laptop or make sure that the system sounds is played on other sound card than the one used for measurements eg laptop internal speakers plays system sounds and USB sound card for measurements If this is ignored you might risk burning a tweeter because of the low frequency content of the system sounds Installation of USB driver The USB interface for programming setups is actually an onboard USB to COM Port RS 232 adaptor and the circuit is made by http www ftdichip com The driver will either be installed automatically by the Windows OS eg Windows 7 or you will have to do it via the installation wizard of the OS If the driver isn t installed automatically when the DCN28 unit is connected to the PC with the supplied cable you will have to download the driver here http www groundsound com CDM 2 04 16 WHOL Certified zip Windows OS or at the manufactures web page It s recommended that you place the driver file on the desktop so it s easy to find and to point out to the installation wizard Remember to unzip the file onto the desktop before starting the installation guide If you have troubles installing the driver then you can find more information at http www groundsound com faq php and if this isn t helping enough contact Ground Sound active groundsound com Note that the Windows OS a
14. up and if you have ended up with very different gains of the output channels Example the tweeter has 10dB mid 6dB and bass is OdB gain you could make this adjustment in the Channel Attenuation on the DCN28 see under Menu of encoder further up You will get the absolute best resolution this way Power Off amp Standby mode At power off or standby mode the input source will be stored and used at power on so you will resume with the same source except when you turn on from stand by via remote Remember to enjoy the music This is why you have invested the time and money in this advanced sound system Note that you will normally play a bit louder than you think you are doing because of the clear and undistorted sound from your new active system Thanks Robert GS www groundsound com 10 Product of Denmark Ground Sound DCN28 Manual DCN28 Specifications Audio Performance 24 bit Resolution 96 kHz Sample Rate Signal to Noise Ratio better than 115 dB THD less than 0 01 Maximum input voltage balanced 2Vrms optional 4Vrms internally configured Input impedance balanced 10kQ Input connectors Neutrik gold XLR 3 pol female pin2 hot pin3 cold pin GND Maximum output voltage balanced 6Vrms Output impedance balanced 200Q Output connectors Neutrik gold XLR 3 pol male pin2 hot pin3 cold pini GND Digital Audio Interface Accepts PCM data format only Supports Sample Rates up to 216kHz Supports Data Reso
15. utomatically assigns a COM port number to the specific FTDI chip If this number is 10 or more you have to reassign this number to a number in the range 1 9 Again see more on the FAQ page Installation of the XOverWizard Il advanced To measure your loudspeaker system and setup the DCN28 you need the XOverWizard I advanced software You can download the XOverWizard II advanced software here http www groundsound com technical php or http www groundsound com download php The software will only run when the supplied USB dongle key is inserted in the PC laptop Note that the software will automatically shut down 3 minutes after the dongle key has been removed so always remember to save measurements and setups before removing the dongle key For information of how to use the XOverWizard II advanced software please look in the help file of the software www groundsound com 3 Product of Denmark Ground Sound DCN28 Manual Front Panel A Ground Sound The front panel on DCN28 is designed so that you have a clear view of selections and values and a simple operation on a daily basis On the front you find the power ON OFF button The easy readable dot matrix display is in center and to the right you find the encoder button which controls the menu selection and changing of values by pushing and turning the button At power ON you will get this welcome sequence The small LED in the display will flash for about 2 seconds be
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