QBD76HD manual - Chord Electronics
Contents
1. Chord Electronics Limited QBD76HD DIGITAL ANALOGUE CONVERTER OPERATING INSTRUCTIONS DE s x De kb Lei a we Un UU BR BR D ke Contents Title page Table of Contents Input Output connection diagram for the QBD76 Mains connection instructions Cleaning and care instructions Initial Start up Audio Outputs Digital Input Selection Using HD USB digital audio Sample rate setup De emphasis coding Setting the RAM buffer Product Specification Chord Quarter Back DAC 76 connection diagram a RAM buffer selector Display Output phase selector Digital input selector USB HD connector Standard Connect to supplied cable Definition Word Clock output USB input Plastic fibre optical inputs AES balanced XLR inputs 75ohm SP DIF2 BNC Coax inputs Right Unbalanced output Left Unbalanced output Left Balanced output Right Balanced output Chord Quarter Back DAC 76HD Operating Instructions Mains connection instructions Please ensure that the IEC mains lead is correctly terminated UK Europe Function USA Canada Brown Live Black Blue Neutral White Green Yellow Earth Green WARNING THE QBD76HD MUST BE EARTHED AT ALL TIMES VIA ITS OWN MAINS LEAD FAILURE TO DO THIS MAY BE HAZARDOUS Plug the supplied lead into the AC inlet and then switch on Cleaning and care instructions The QBD76HD requires no special care other than common se2. Select the sample rate and bit depth to be used when running in shared mode 2 channel 24 bit 192000 Hz Studio Quality v gt Test Exclusive Mode IN Allow applications to take exclusive control of this device Idi Give exclusive mode applications priority Then click OK all Sound r weg ge Playback Recording Sounds Select a playback device below to modify its settings Digital Output 2 Chord Async USB 44 1kHz 192kHz Speakers Conexant High Definition Audio Working Configure SetDefauit Properties Lo Apply It is also a good idea at this stage to set the Digital Output as the default sound output device Highlight Digital Output as shown then click the Set Default button at the bottom of the page Click the OK button to continue Sample rate setup is now complete De emphasis coding The QBD76HD will automatically detect when a pre emphasized recording is being played and will set the correct de emphasis filters in the converter section Setting the RAM buffer There are three settings for the RAM buffer The options are as follows Buffer applied Display No buffering OBUFF Minimum buffering MIN Maximum buffering MAX The receiver chip takes the data from the transport and generates clocks and data in a form that the filter can accept This has two major benefits all digital data extraction and a RAM
3. 1Khz 192Khz input dependant 6V rms Balanced 3V rms unbalanced 75ohm short circuit protected 338 x 60 x 145mm Width x Height x Depth 7Kg 13
4. buffer This RAM buffer sequentially takes all the data retimes it and sends it out The RAM buffer allows the jitter free local clock operation without needing to send back a clock signal to the data source There is however a word clock output located by the power connector on the rear of the QBD76HD N B When using the QBD76HD with the buffer set to anything apart from OBUFF there is a time delay from pressing Play to hearing music Whenever switching between the different buffer settings there is a delay another delay before the music resumes N B It is important to set the volume on the pre amp amplifier to minimum when switching between digital inputs or setting the Ram buffer on the QBD76HD a12 Product Specification HARMONIC DISTORTION SIGNAL TO NOISE RATIO CHANNEL SEPARATION DYNAMIC RANGE DIGITAL INPUTS ANALOGUE OUTPUTS RAM BUFFER SWITCH PHASE SWITCH SAMPLE FREQUENCIES OUTPUT MAX OUTPUT IMPEDANCE DIMENSIONS IN MM WEIGHT lt 103dB gt 120dB gt 125dB 1KHz 122dB 2 x 75Q SP DIF BNC Coax 44 1KHz 192KHz 2 x AES Balanced XLR 44 1 KHz 96KHz 176KHz 192KHz dual cable 2 x Plastic fibre optic TOSlink 44KHz 96KHz 176KHz 192KHz dual cable 1 x USB B type 44 1KHz 48KHz 1 x 4 pin high speed to USB A type 44KHz 192KHz 2 x RCA Phono 2 x Balanced XLR switches between No buffering Minimum buffering and Maximum buffering 2 Settings Positive or Negative output phase 44
5. foobar2000 org components view foo_out_ks It is a zip folder which contains the DLL Extract it from the zip and copy to the Components folder Then restart FooBar go to the File Preferences Playback Output window and set Parameters 5 2 Winamp and MediaMonkey These two players are actually the same player with different skins so they can share the same plug ins A freeware plug in for Kernel Streaming by Steve Monks is available on the Internet http www stevemonks com ksplugin that can be used to enable Kernel Streaming operation with these players Download the zip file extract the dll file and copy it into the Plugins folder inside Winamp main folder With QBD76HD connected right click on Winamp and select Display Select Plug ins The Preferences window of Winamp will open Go to Plug in Output and select Kernel Streaming Output Then click on Configure button Choose QBD76HD Kernel Streaming in the output device list Configuring the player for WASAPI an example FooBar To use FooBar with WASAPI under Windows 7 it is necessary to download the DLL for WASAPI from the FooBar2000 website and install it in the Components sub folder inside FooBar2000 main folder in your hard disk The DLL can be found at http www foobar2000 org components view foo_out_wasapi It is a zip folder which contains the DLL Extract it from the zip and copy to the Components folder Then restart FooBar go to the File Preferences Playback Output
6. window and set parameters Sample rate setup for OBD76 HD Windows Vista Example Once the driver software has been installed and the QBD76 HD connected to a Windows based computer then the digital audio sample rate needs to be set as follows Stage 1 Configuring audio devices Connect the QBD76 HD to the computer with the supplied USB cable Run the Windows Control panel and select Hardware and Sound EEA GO gt Control Panel Hardware and Sound Sf Search Control Pane D Control Panel Home J Devices and Printers E Md Add a device Add a printer Mouse P Device Manager Network and Internet A AutoPlay et Sound Change default settings for media or devices Play CDs or other media automatically Programs CN Sound HERE Adjust system volume Change system sounds Manage audio devices DE P Power Options se and Change power saving settings Change what the power buttons do SEULE Require a password when the computer wakes Change when the computer sleeps Clock Language and Region Choose a power plan Ease of Access a amp Display Make text and other items larger or smaller Adjust screen resolution Connect to an external display How to correct monitor flicker refresh rate d es VIA HD Audio Deck The select Manage Audio Devices Select a playback device below to modify its settings Digital Output 2 Chord Async USB 44 1kHz 192kHz Work
7. ed XLR input AES and two Plastic Fibre Optic Opt and a USB B type connector USB1 and USB HD 192KHz USB2 using the supplied cable Each of these inputs can be selected by using the selector switch on the top panel of the unit The switch is located directly above the display see connection diagram The sequence of input selection is as follows Function Display USB HD 192KHz USB2 750hm SP DIF2 BNC COAX AES balanced XLR AES Plastic Fibre Optic OPT USB B type connector USB1 On powering the unit there should be a coloured glow from the central located glass window the display will then scroll the word chord then display the source that is selected then the phase mode positive or negative then the level of RAM buffer selected OBUF if RAM buffer is not in use and then will remain displaying the input selected Once digital lock has been achieved the word LOCK will be displayed briefly then the frequency that the lock has been achieved at either 44K 48K 88K 96K 176K or 192K to represent 44 1 Khz 48Khz 88 2Khz 96Khz 176 4Khz or 192Khz Using USB HD Digital Audio Connection to the host computer Connect the QBD76HD to the host computer by inserting the supplied USB lead into any available USB 2 0 socket To support 192KHz the USB socket on the computer must be USB 2 0 or above Once connected insert the other end of the supplied cable into the QBD76HD making sure that the red dots are aligned and pointing upwards I
8. fa driver hasn t been installed on your computer an automatic driver installation wizard may appear Note If you want to avoid the automatic driver installation please connect the QBD76HD to the computer after manually installing the driver Driver installation The drivers for QBD76HD are available on the supplied CD Windows drivers are contained in zip files Mac drivers are contained in dmg files For Windows XP use chordxp zip for Windows Vista or Windows 7 use chordwin7 zip For the Apple Mac operating systems the dmg files are for OS 10 4 ChordUsb_148104 dmg 10 5 ChordUsb_148105 dmg or the latest Snow Leopard 10 6 ChordUsb_148106 dmg If you have lost the CD please download drivers at www chordelectronics co uk on the QBD76HD product page Installing the driver on a Windows PC Create a temporary folder on the hard disk of your computer this can be on your desktop Double click on the zip file contained on the CD to open it Select and drag all files in the temporary folder this will automatically unzip all the files Automatic installation Connect QBD76HD to the PC Following the negotiation process the driver installation wizard is automatically launched Click on the button to proceed Choose automatic installation as recommended and proceed to next step Indicate the folder where you have previously unzipped the driver and proceed to installation Click on Continue The installation will proceed to the end You ma
9. ing Speakers d Conexant High Definition Audio Working Configure Set Default Properties C E Here you have a list of the connected audio devices The QBD76 HD is identified as a digital output device with the Chord Async USB 44 1kHz 192kHz driver installed Shown at the top of the list here Right click the digital output and select properties to show the following screen Digital Output Properties General Supported Formats Levels Advanced Digital Output D Gaal Controller Information 2 Chord Async USB 44 1kHz 192kHz chrdi 24 192 USB Interface Jack Information No Jack Information Available Device usage Use this device enable Zz ox zen Select the Advanced tab at the top of the window 10 r Digital Output Properties General Supported Formats Levels Advanced Default Format Select the sample rate and bit depth to be used when running in shared mode 2 channel 16 bit 44100 Hz CD Quality Exclusive Mode W Allow applications to take exclusive control of this device Give exclusive mode applications priority Restore Defaults Here you can change the default format to the sample frequency you require We recommend 2 channel 24 bit 192000 Hz Studio Quality Click the arrow and select the format e e A Digital Output Properties x Default Format
10. iver Please note that in Windows XP there is no direct sample rate setup in the audio settings panel Sample rate can only be selected in Kernel Streaming mode with an appropriate player Configuring for Direct Sound with Windows XP Connect QBD76HD to your PC Then go to the Control Panel and launch the Sound and Audio Peripherals utility Select the Audio tab In the Predefined Peripheral drop down menu of the Playback area select Chord Async USB 44 1kHz 192kHz Then select the Voice Tab Again select Chord Async USB 44 1kHz 192kHz in the drop down menu of the Playback area Click on OK button Please be advised that even if the QBD76HD peripheral is listed as kernel streaming it will operate in Direct Sound mode when listed here From now on unless QBD76HD is disconnected or settings are changed again QBD76HD is the audio peripheral all audio programs will use when operating in direct sound mode Configuring for Kernel Streaming with Windows XP Kernel Streaming has no standard setting in Windows XP KS must be selected in the specific player you choose to use For example when using FooBar with QBD76HD connected to the PC go to the File Preferences Playback Output tab and select Chord Async USB 44 1kHz 192kHz as output device Other players will require different settings Using QBD76HD in both Kernel Streaming and Direct Sound mode When QBD76HD is selected as an audio peripheral it s
11. k on Restart button to complete the installation process Unistalling the driver Windows PC only Sometimes it is necessary to uninstall the driver to roll back to a previous version Uninstall is a quite simple procedure which depends on the operating system and the way the driver was installed Uninstalling the driver on a Windows based PC after installation with setup32 exe or setup64 exe Go to the control panel and launch the program and features add remove programs utility Look for the Chord Async USB 44 1kHz 192kHz driver item in the list Double click on it to launch uninstalling Manually uninstalling the driver on a Windows based PC Connect QBD76HD to the PC Go to the control panel and launch the System utility then select Hardware tab Open the Device Management window You will find Chord Async USB 44 1kHz 192kHz device listed under Audio Video and Game controllers Right click to access the available actions Select Uninstall Configuring the computer to use QBD76HD Configuring a PC with Windows XP A PC with Windows XP can use QBD76HD in two different ways Direct Sound DS and Kernel Streaming KS Direct Sound is suitable for players which can t operate in Kernel Streaming mode such as Windows Media Player and iTunes or for Internet streaming Kernel Sound can be chosen for better performance with players which can operate in Kernel Streaming mode such as FooBar Winamp Monkey Media JR
12. nse Spray window cleaner clear type may be used if first sprayed onto a soft cloth to remove surface blemishes such as finger marks from the metal casing Never spray directly onto the converter and never use abrasive cleaning use only a lint free soft cloth There are no user serviceable parts in the QBD76HD It should be serviced only by Chord Electronics Limited or their expressly approved service agents NB This unit must be ventilated at all times with at least 5cm space around and above the unit Initial Start up If there is no output from the DAC once everything has been connected and the digital source is playing it may be that the DAC has not set itself Remove the power lead and wait for 30 seconds before powering up This should be enough time for the DAC to configure itself Audio Outputs There is one pair of Left amp Right fully balanced outputs via Neutrik XLR style connectors and one pair of Left amp Right unbalanced outputs via gold plated RCA phono style connectors Each of these will drive down to a 50ohm load This means that the QBD76HD will work with all known pre amplifiers and is able to drive very long audio cables without difficulty Both audio outputs work at the same time this allows the QBD76HD to be connected to two pre amplifiers if needed Digital Input Selection The QBD76HD enables you to use any one of five digital input formats These consist of two 75ohm SP DIF2 BNC COAX and two AES balanc
13. possible to use it in both Kernel Streaming mode and Direct Sound mode When using it in KS mode it is necessary that no other application accesses QBD76HD in DS mode If this happens Windows XP s Kernel Mixer takes control of QBD76HD s driver and from then on no KS application can access QBD76HD unless the PC is restarted or QBD76HD connection to the PC is cycled Configuring a PC with Windows Vista or Windows 7 A PC with Windows Vista or Windows 7 can use QBD76HD in three different ways Direct Sound DS Kernel Streaming KS and WASAPI DS is suitable for players which can t operate in Kernel Streaming mode nor with WASAPI or for Internet streaming KS can be chosen for better performance with players which can operate in Kernel Streaming mode such as FooBar Winamp Monkey Media JRiver WASAPI Windows Audio Standard API is a standard interface for audio players which allows to get the same performance of KS with applications which can t operate in KS mode at the cost of higher CPU load Configuring for Direct Sound with Windows Vista or Windows 7 Open control Panel and select Hardware and Sounds Under Audio click on Manage Audio Devices Set Chord Async USB 44 1kHz 192kHz as default device Then click on OK Configuring for Kernel Streaming with Windows Vista or Windows 7 As for Windows XP Kernel Streaming has no standard setting in Windows Vista and Windows 7 KS must be selected in the specific player you choose
14. to use For example when using FooBar with QBD76HD connected to the PC go to the File Preferences Playback Output tab and select Kernal Streaming Chord Async USB 44 1kHz 192kHz as output device Other players will require different settings Configuring for WASAPI with Windows Vista or Windows 7 Similar to Kernel Streaming WASAPI cannot be directly accessed WASAPI must be selected in the specific player you choose to use For example when using FooBar with QBD76HD connected to the PC go to the File Preferences Playback Output tab and select WASAPI Chord Async USB 44 1kHz 192kHz as output device Other players will require different settings Configuring Mac OS X Open the System Environment Settings from the Start menu Open the Sound options from the System Environment settings Select the Output tab and confirm the Chord Async USB 44 1kHz 192kHz USB audio codec appearance as the default output device Sample Rate Setup Open the Audio MIDI Settings options Application Utility Set Audio MIDI Select the Audio Output tab in the Set Audio MIDI Select the desired sample frequency from the options given Configuring the player for Kernel Streaming some examples FooBar To use FooBar in KS mode it is necessary to download the DLL for Kernel Streaming from the FooBar2000 website and install it in the Components sub folder inside FooBar2000 main folder in your hard disk The DLL can be found at http www
15. y get warning messages indicating that the driver is not digitally signed just click yes to continue installation Click on Finish to complete the driver installation Note the wizard appearance and the guided installation procedure may slightly vary from XP to Vista to Windows 7 Manual installation Sometimes it is necessary or advisable to install the driver manually The installation package offers two installation utilities setup32 exe and setup64 exe The former is for 32 bit operating systems while the latter is for 64 bit operating systems Without connecting QBD76HD to the PC double click on either setup64 exe or setup32 exe depending on your operating system the driver will automatically be installed on your PC Installing the driver on a Mac Double click on the zip file to open it It contains a single dmg file Extract it from the zip and double click on it to open it It only contains a pkg file Double click on it to start driver installation Click on the Continue button Select Install for all users then click on Continue button You ll be asked to type in the administrator password After doing that the installation process will continue and you ll be asked for a confirmation to continue the process up to the computer restart Click on Continue Installation button The installation will continue until the final window appears showing the successful installation of the driver Clic
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