User's manual 2 azur 851D Your music + our passion ENGLISH Upsampling DAC/Digital Pre-Amp
Contents Important safety instructions Important safety instructions......................................................................2 For your own safety please read the following important safety instructions carefully before attempting to connect this unit to the mains power supply. They will also enable you to get the best performance from and prolong the life of the unit: Limited warranty...........................................................................................
851D Ventilation IMPORTANT – The unit will become hot when in use. Do not stack multiple units on top of each other. Do not place in an enclosed area such as a bookcase or in a cabinet without sufficient ventilation. The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of un-insulated 'dangerous voltage' within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
Limited warranty Cambridge Audio warrants this product to be free from defects in materials and workmanship (subject to the terms set forth below). Cambridge Audio will repair or replace (at Cambridge Audio's option) this product or any defective parts in this product. Warranty periods may vary from country to country. If in doubt consult your dealer and ensure that you retain proof of purchase.
azur 851D 8 10 ENGLISH Rear panel connections 11 6 1 2 3 4 5 7 12 13 9 1 Power On/Off Switches the unit on and off. This product has APD (Auto Power Down) enabled as default. After inactivity of 30 minutes, the product will automatically switch to Standby. See later section for further details. 2 AC power socket Once you have completed all connections to the DAC, plug the AC power cable into an appropriate mains socket then switch on. Your unit is now ready for use.
Rear panel connections cont. 12 Unbalanced Audio Output 13 Balanced Audio Output The 851D features balanced outputs on two XLR sockets. Balanced outputs provide slightly better audio performance and can reject cableborne noise and interference when used with equipment with balanced inputs. A conventional RCA phono stereo output for connection to the line-level inputs of an amplifier. Use a high quality stereo RCA phono interconnect cable intended for analogue audio signals.
azur 851D The 851D is supplied with a Cambridge Audio System remote control that operates both this upsampling DAC/digital pre-amp and Cambridge Audio 851 series and Stream Magic products. Insert the supplied AAA batteries to activate. 1 The functions relevant to the 851D are as follows: 1. Standby/On The following functions are available via USB and Bluetooth playback. Note: These functions will depend on the audio software installed on the host personal computer or paired devices.
Source connections Important: Do not turn on any of the units until all connections have been made. When designing our products we include features that allow you to connect your system in various ways. The inclusion of these features means that you can flexibly configure your system depending on your requirements. PC–USB connection The diagram below shows the USB audio input connection from a personal computer using a type A-B USB lead to your 851D and an 851A amplifier using Source 1 (Balanced).
851D Pre-Amp mode connection with power syncing Control Bus connection The diagrams below shows the 851D in Pre-Amp mode, connected to an 851W power amplifier through the Balanced Audio Out and also with power syncing connection, through Control Bus or Trigger Out. See later section of the manual. Control Bus is the recommended method when using the 851D and other Cambridge Audio equipment with Control Bus In/Out.
Operating instructions The 851D has a custom-made display on the front of the unit that shows the current status and allows you to access the system settings menu. Here you can adjust the listening settings to your personal preference. The system menu is easy to navigate and control, simply by using the input select buttons to turn a feature on (solid circle) or off (no circle) and the volume control knob to increase/decrease settings.
851D Pre-amp mode Front IR The 851D can optionally be used as a digital pre-amp and connected directly to a suitable power-amp. Used in conjunction with Custom Installation (C.I.) systems or IR repeater systems. It may be desirable to disable the front panel IR by setting Front IR to off, go to Settings menu and press the Front IR button to turn off (the solid circle should not show). To ensure that the Pre-Amp mode is selected, press the Menu button then select the Pre-Amp item.
Bluetooth Filters The 851D is supplied with a BT100 Bluetooth adaptor. This allows the 851D to receive wireless Bluetooth audio from suitable phones/tablets and laptops. The 851D DSP has three different Filter functions: Linear Phase, Minimum Phase and Steep. All three filters are highly sophisticated audiophile topologies, optimised specifically for audio playback. In our opinion, these filters offer excellent sound quality but differ subtly in optimisation, hence we’ve made all three available to you.
Minimum phase filter 851D Impulse response Frequency response 20 Amplitude 0 -20 Magnitude (dB) -40 0 -60 -80 -100 0 -120 20 40 60 80 100 120 140 160 180 Time (samples) -140 Note: All filters exhibit the same ultimate roll-off of approximately 140dB. -160 The following table shows the filter stop band attenuation for 44.1kHz material: -180 -200 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Linear Phase Minimum Phase Steep Roll-off at 20kHz -0.1dB -0.
Custom installation (C.I.) use Troubleshooting The 851D features a Control Bus input/output that allow un-modulated remote control commands (positive logic, TTL level) to be received electrically by the unit and looped to another unit if desired. These control commands are typically generated by custom installation (multiroom) systems or remote IR receiver systems. The Control Bus sockets are colour-coded orange.
azur 851D All measurements are for 24-bit signals via the digital inputs so as not to be source material limited unless stated. Dimensions - H x W x D 115 x 430 x 360 mm (4.5 x 16.9 x 14.7”) D/A converters Dual Analog Devices Max power consumption 40W AD1955 24-bit DACs Idle consumption 8W approx Digital filter Analog Devices Black Fin Standby power consumption <0.5W ADSP-BF532 32-bit DSP performing 2nd Generation ATF2 up-sampling to 24-bit 384kHz Weight 7.5kg (16.
Cambridge Audio is a brand of Audio Partnership Plc Registered Office: Gallery Court, Hankey Place London SE1 4BB, United Kingdom Registered in England No. 2953313 © 2013 Cambridge Audio Ltd AP32805/1 www.cambridge-audio.
