AMS NEVE 8051 User's Manual
Contents
1. Rack Mounting and Cooling The rack units should be installed in a 19 cabinet with access to the front and rear No specific air conditioning is required for the racks provided that there is a free flow of air through the rack from front to back and that the ambient air is maintained below 30 degrees centigrade Therefore the racks may be stacked Power Requirements 8051 Units Rated Voltage 100 250V AC Rated Frequency 47 63 Hz Rated Current 25A at 250V Primary Protection Fuse Operating Voltage 250 110V Fuse Rating and Type T1 6A T1 6A A S Ceramic Location Rear Panel IEC Mains Connector Mains Supply The power supply unit is a universal input type therefore no mains operating voltage setting is required The CH chassis and OV are linked externally See the rear panel layout for AM4851 amp AM5292 Issue 2 Page 2 8051 5 1 Compressor User Guide Rear Panel Connectors a Mating connectors are not supplied with these units CONTROL KEYINPUT INPUT6 INPUTS INPUT4 INPUT3 INPUT2 INPUT J y e f N J gt NM NN OUTPUT 4 OUTPUT3 OUTPUT 2 ore Ce O q J FUSE 1 6A A S CERAMIC C e INPUT VOLTAGE 100 250V AC INPUT FREQUENCY 47 63Hz hp CONTROL VOLTAGE I O 15 Pin D Type KEY INPUT XLR Socket INPUT 1 6 XLR Socket OUTPUT 1 6 XLR Plug These connectors apply to both the Standard and Mastering Compressor AM4851 amp AM522. VBDC Filename j Ow ow mun te m VUNI VA SIDECHAIN A TIMING CONTROL SIDECHAIN A TIMING CONTROL TamtSecu0 Aue scompararon JXTUENAL I NPUT EOM ANOTHER UN 1 XTUPNAL PUT TOV ANOTHER Vw Y gt fxtctrowe BE BALANCE AWD BAIN REDUCTION 8051 Multichannel Compressor O S Functional Block Diagram 7 N EV E Paae 17 Issue 2
3. 34 BYPASS C c FIBHIBSIC epee Sr SIDECHAIN LINK SC TRIMS dB 7 SIDECHAIN FILTER N E Essent _ CONTROL LINK Spade gt 882 8 GE e 20 l6 4 THRESHOLD dBu t THRESHOLD dBu o 146 4 12 sfQ 16 E EON NS 20 soa MAKE UP aoa MAKE UP 21 61 GAIN dB s 3 GAIN dB PE LIES pou ATTACK m ES RECOVERY RECOVERY GAIN REDUCTION GAIN REDUCTION THRESHOLD dBu 2 TRACK MIXER i TT E m m m E B i a S S O E E User Guide As this unit is designed for fixed 5 1 compressor applications in an 88R S console the EXT A CTRL and EXT B CTRL controls are not selectable blank buttons Issue 2 Paae 14 8051 5 1 Compressor I O Wiring AM5052 amp AM5265 56 Way Free Plug Varicon Issue 2 Signal Signal Name Pin Number Hi Lo Scn 1 Left Input C J D 2 3 Centre Input P V K 3 2 Right Input U Z d 4 A Input Y c f 5 5 LS Input s m j 6 6 RS Input x t n 7 1 Left Output CC y JJ 8 3 Centre Output MM HH NN 9 2 Right Output B F A 10 4 S Output L R 11 5 LS Output S W a 12 6 RS Output X b e 13 Key Input r h 14 v p k 15 z U DD 16 LL EE KK User Guide Page 15 8051 5 1 Compressor User Guide 1 0 The key input and LFE filter inputs are electronically balanced with an input impedance of 1 Okohms All other inputs are transformer balanced with 3 6kohms input impedances Al
4. HH Output ast A Output slow TIME IL Input onde nt Output fast ite n Output slow TIME il Gain Reduction Meters User Guide GAIN REDUCTION 19 V 0 aM a NN os k ATTACK E w e GANGS isa E 12 RECOVERY GAIN REDUCTION 4 n P aw UP a NUN Z di E N MAKE UP 2p N 8 GAINGB 16 e 12 RECOVERY This is the time between a signal 6dB above the threshold level being applied and the output signal falling to within 2dB of its final level With slower attack settings compression is more dependant on the average signal level while with faster settings it is more dependant on the peaks Setting of 2ms 4ms 6ms 8ms and 16ms are available If a signal 6dB above the threshold has been applied for long enough that the output has reached its steady state level recovery is the time taken for it to get to within 2dB of its final level if the input is dropped by 6dB Recovery compliments the attack control by filtering the control voltage longer recovery times prevent pumping effects where gain reduction follows the program material too closely Settings of 100ms 200ms 400ms 800ms 1 5s and 3s are available Gain reduction meters are provided post the A B Bias control and pre the CV Link routing buttons to show the level of attenuation being applied The meters have 20dB f s d Issue 2 Page 11 8051 5 1 Compressor User Guide Key Input A Key Input is provided to allow adjustable control
5. to sidechains A and B the lower value of the two controls is used The threshold controls have a range of 20dBu to 16dBu adjustable in 2dB steps Each channel s threshold may be modified by up to 1 5dB irrespective of its linking by using the SC Trim controls A red LED indicator is provided in each sidechain link button This indicates that a channel is above threshold and either is the dominant signal or within 2dB of the dominant signal on that sidechain Gain Makeup is used to restore the average level or loudness of a compressed signal Linking control voltage to a channel with the CV Link buttons assigns either the A or B Gain Makeup control to that channel If control voltage from both sidechains is linked the larger of the two values is used this is because the sidechain with the greater gain reduction will be controlling the channel The gain applied is adjustable from 10 to 20dB in 2dB steps Ratio controls the amount of gain reduction applied as the input level increases At 2 1 for example a change of 10dB at the input produces a change of 5dB at the output Values available are 1 5 1 2 1 3 1 4 1 6 1 and max approximately 8 1 The 8051 has a soft knee characteristic and its ratio gradually increases as the compression becomes heavier at all settings The numbers given should therefore be considered average values Page 10 8051 5 1 Compressor Attack Recovery E THRESHOLD dBu Input sen
6. 8051 5 1 Compressor AMS NEVE 805 5 1 Compressor User Guide 2005 AMS Neve Ltd own the copyright of all information and drawings contained in this manual which are not to be copied or reproduced by any means or disclosed in part or whole to any third party without written permission As part of our policy of continual product improvement we reserve the right to alter specifications without notice but with due regard to all current legislation Disclaimer The information in this manual has been carefully checked and is believed to be accurate at the time of publication However no responsibility is taken by us for inaccuracies errors or omissions nor any liability assumed for any loss or damage resulting either directly or indirectly from use of the information contained within it Issue 2 527 357 Issue 2 HEAD OFFICE AMS NEVE LTD BILLINGTON ROAD BURNLEY LANCS BBI I SUB ENGLAND TELEPHONE 44 0 1282 457011 FAX 44 0 1282 417282 LONDON OFFICE TELEPHONE 44 0 20 7916 2828 FAX 44 0 20 7916 2827 NORTH AMERICAN OFFICES AMS NEVE INC NEW YORK TEL 1 212 965 1400 FAX 1 212 965 9306 AMS NEVE INC HOLLYWOOD TEL 1 818 753 8789 FAX 1 818 623 4839 e mail info ams neve com http www ams neve com User Guide 8051 5 1 Compressor User Guide Contents Introduction 1 Dimensions 2 Rack Mounting and Cooling 2 Power Requirements 2 Mains Supply 2 Rear Panel Con
7. 92 For I O wiring on 88R S console mounted compressors AM5052 amp AM5265 see page 15 Issue 2 Page 3 8051 5 1 Compressor Compressor Controls f FILTER TO CHANNEL a am o S bi 2 3 4 5 6 Mi a VN ATTACK E x mat D ZN BYPASS X ET LTIS ZN set 12 8 GAIN dB 151 7 SIDECHAIN LINK 1727 37 47 57 6 16 12 THRESHOLD dBu C7 SIDECHAIN FILTER n S oe angad No CONTROL LINK e m sp o4 21 MAKE UP 8 GAINdB 151 p E 16 THRESHOLD dBu LFE Filter Filter to Channel A 12dB octave low pass filter can be assigned to any one channel This filter is applied directly to the input before the relay bypass point and its 3dB frequency is selectable from 80 100 or 120Hz Issue 2 User Guide GAIN REDUCTION MULTI CHANNEL COMPRESSOR 777777 FILTER TO CHANNEL s 858000 MM BYPASS e 0000 77 SIDECHAIN LINK Pricer DAA ae 5 sc Trims aB 4 7 SIDECHAIN FILTER cn nO JEJE we s i Page 4 8051 5 1 Compressor User Guide Bypass All channels have relay bypass Bypass is from the output of the LFE filter to the input of the Output Level Control T mm BYPASS me rj DID PIS 51 2 15 sie 15 777 SIDECHAIN LINK mm O 7 FILTER TO CHANNEL BABE BA M TRIMS a 777 SIDECHAIN FILTER mmm m Znnnpan 0 77 CONTROL LINK EM 1 FUE 37 47 57 6 Neve EM GAIN REDUCTION Audio Out B
8. YPASS TXF GAIN OUTPUT MAKEUP LEVEL LFE INPUT FILTER Y SIDECHAIN tomos be If a channel routed to a sidechain is bypassed its connection to the sidechain is maintained This means that other channels controlled by that sidechain are unaffected and allows a channel to control others without being compressed itself as though it were another key input Two bypass modes are available single or master In single mode each switch bypasses its respective channel In master mode all channels are controlled together from the channel 1 bypass button Master mode is toggled by pressing and holding the channel 1 bypass switch and is indicated by the MST LED to the left of channel 1 being lit If individual channels are placed in Bypass mode the Master Bypass function then becomes a Group Bypass control for the remaining channels In Master Mode individual channels can be deselected from the master group and will remain in local bypass indicated by permanently lit bypass buttons fy The elements outside the bypass loop are designed to be audibly transparent Typical distortion in bypass is 0 000896 at 1kHz typical 20Hz 20kHz band noise is lt 90dBu Issue 2 Paae 5 8051 5 1 Compressor User Guide Sidechain Link The sidechain link buttons route audio from each channel s sidechain audio path into one or both of the sidechain timing circuits If a single channel s SC LINK A or B button is pressed that channel will
9. all switches are disabled switch settings are retained and the unit consumes minimal power Pressing the power switch brings the unit out of standby power switch illuminates green Pressing and holding returns it to standby mode f The unit can be brought out of standby remotely by connecting pins 1 and 12 on the rear panel D Type connector Issue 2 Paae 12 8051 5 1 Compressor User Guide Mastering Compressor Controls AM5292 The 8051 Mastering Compressor is slightly different to the standard 8051 in 2 ways Q It has 21 position detented pots for the Trim and Bias controls to aid total mechanical recall of the unit Q It has 1dB switches fitted to the Threshold and Gain Make Up controls to allow for more accurate settings for example in a mastering application the entire range of the switches can be turned from 2dB steps into 1dB steps by the selection of the 1dB switches 21 Position Detented Pots 1dB Switches e m e ane 1 f FILTER TO CHANNEL o GAIN REDUCTION 2S 12 ams ae 1 me Mo Li dB os N 4 Py 4 0 ip 420 1 4l E EN Ls ya E 61 ANAL MN d N ih MAKE UP T di Wu SA 8 G NdB 151 7 SIDECHAIN LINK 16 Y d EE E 16 6 THRESHOLD dBu RECOVERY MULTI CHANNEL COMPRESSOR 7 SIDECHAIN FILTER VAUAPADAUAD HS 1 41 AA E EE THRESHOLD dBu RECOVERY Issue 2 Paae 13 8051 5 1 Compressor 8051 Compressor 88R S Console mounted AM5052 77 FILTER TO CHANNEL
10. behave as a mono compressor If another channel is then linked to the same sidechain the timing circuit responds to whichever channel is larger at any moment taking into account the setting of the SC trim controls The resulting control voltage is then applied equally to both channels i e they behave as a stereo linked compressor o 0 CV LINK 1A O O CV LINK 1B Audio In Audio to O P level trim SIDECHAIN A TIMING CONTROLS lt O O SC LINK 1A SIDECHAIN SIDECHAIN CHANNEL FILTER ASSIGNED T HOLD T HOLD TRIM SIDECHAIN B El TIMING CONTROLS lt O O SC LINK 18 Sidechain Filter Issue 2 Inserts a high pass filter in the channel s sidechain path preventing unwanted compression due to LFE content The response is 12dB octave shelves at 20dB this is required to maintain the sidechain s phase margin and has a selectable 3dB frequency of 80 100 or 120Hz Paae 6 8051 5 1 Compressor User Guide Control Link Issue 2 While the SC link buttons control the audio inputs to CR UIT each sidechain the CV link buttons choose where uiisi isie the D C control voltage generated by each ee Eee sidechain is routed The CV link buttons also T du 2 3 4 5 6 determine which gain makeup control affects each AAAAAR channel in the same way that the SC link buttons C IE i fees i BJ B B al B assign the threshold controls
11. from an external ae source Like the sidechains the key input has a threshold level EQ llis control ranging from 20 to 16 to set the intended level at which 2 compression control is required Qi It can be used in several ways x mis 8051 Q Injecting tone to provide a remotely variable base level of Jie AES EJ compression on one or both sidechains Q Ducking from an audio source such as dialogue Q When connected in parallel with one of the inputs it allows that input to be routed onto both sidechains with different compression thresholds Key Filter The key input is provided with a selectable 1 2dB octave high pass LFE filter fixed at 100Hz Bias Control The bias control is used to balance the control voltages from the two sidechains by applying up to 6dB of cut and boost effectively modifying their ratios If only a single sidechain is in use for example when used as a stereo compressor the bias control allows ratio values between the standard settings to be selected with continuously variable control Output Level This control provides a variable active pad across all six outputs from OdB to 5 5dB in 0 25dB steps The pad is outside of the relay bypass loop and so always controls all six channels together in order to maximise the unit s output level without clipping Power The power switch is illuminated dim red when the mains is present to indicate that the unit is in standby mode While in standby
12. l outputs are electronically balanced post the output transformers with maximum output of 26dBu into 600ohms The unit is calibrated for bridging loads greater than 1Okohms Control Voltage I O is provided for linking multiple units or linking to 33609 compressors Connection is by 15 pin D Type see the section on EXT control for details Audio Performance Equivalent input noise 20kHz band 78dBu THD N for 20dBu input 1kHz Maximum Output Level Interchannel Crosstalk Control Issue 2 LFE Filter Sidechain amp Key Filters Threshold Make up gain Ratio Attack Release Output Level Trim lt 0 03 gt 26dBu into 600 ohms lt 80dB at 15kHz 12dB octave low pass 3dB frequency selectable to 80Hz 100Hz or 120Hz 12dB octave high pass 3dB frequency selectable to 80Hz 100Hz or 120Hz 20dBu to 16dBu master control with 15dB trims on all channels 10dB to 20dB 1 5 1 2 1 3 1 4 1 6 1 MAX 8 1 2ms 4ms 6ms 8ms and 1 6ms 100ms 200ms 400ms 800ms 1 5s and 3s OdB to 5 5dB pad in 0 25dB steps Page 16 User Guide 8051 5 1 Compressor rast noseren 1393 9 omar e wur mip semwa on oo permoro ae G Tounaa ron DSCREIE POWER AMP OOTDUS TIE er T gt O i rapona a COMPAKATOR nerro Awe 4 COMPARAFON GAINCELL DERAANOETS DSCREN POWER AMO OIU TE E fi ps Leors DH ACPETI ROWER aus D SCPTE POWER auo EJ
13. less either a channel or the key has been routed to the associated sidechain or when in external mode Page 7 8051 5 1 Compressor SC Trims and Threshold Issue 2 Thresholds for each channel are determined by sidechain path gain which is applied in two stages The two main threshold controls are first assigned to each channel with the SC Link buttons providing a base threshold level for each of the sidechains The SC Trim controls then allow threshold adjustment on individual channels of 15dB irrespective of how they are linked The trims are grouped as two stereo pairs channels 5 and 5 6 and two monos channels 3 and 4 Once above the sidechain s threshold level the link button for the largest signal on that sidechain after the threshold gain has been applied illuminates red Any signal that is above threshold and within 2dB of the dominant signal will also illuminate o La ESTY User Guide Communes FILTER TO CHANNEL E EJESESESESES a BYPASS BH e 0 PLETI 7 SIDECHAIN LINK BA al al al al Zl 1513 2 16 5 671 BAA Be SC TRIMS GB 777 SIDECHAIN FILTER mm mb e 7 CONTROL LINK mmm CM m Paae 8 8051 5 1 Compressor User Guide EXT Control Issue 2 The EXT buttons provide an insert point in the control voltage signal after the bias control but before routing back to the channels During normal operation the control voltages generated by the sidechain are in
14. nectors 3 Compressor Controls 4 LFE Filter Filter to Channel 4 Bypass 5 Sidechain Link 6 Sidechain Filter 6 Control Link 7 SC Trims and Threshold 8 EXT Control 9 Threshold 10 Gain Makeup 10 Ratio 10 Attack 11 Recovery 11 Gain Reduction Meters 11 Key Input 12 Key Filter 12 Bias Control 12 Output Level 12 Power 12 Mastering Compressor Controls AM5292 13 8051 Compressor 88R S Console mounted 14 I O Wiring AM5052 amp AM5265 15 Specifications 16 8051 Block Diagram 17 Issue 2 Paae ii 8051 5 1 Compressor User Guide Issue 2 Te 8051 is an analogue compressor that provides six transformer balanced audio paths complemented by two sidechains and a key input Input and output to the sidechains is assignable to and from the six channels Assignable LFE filters on the input and sidechains along with the key input provide integrated bass management Flexible sidechain routing trimming and filtering make this a powerful and responsive tool for surround mixing The 8051 uses the same feedback topology as the 33609 compressor and includes the same transformers diode bridge gain control and discrete power amplifiers in the audio path 8051 MULTI CH COMPRESSOR 8051 5 1 Compressor Page 1 8051 5 1 Compressor User Guide Units U Depth Height Approx Weight mm inches mm inches kg Ibs 8051 Compressor AM4851 and AM5292 3 500 20 135 5 25 10 5 23 not including mains plug
15. prey Emm For the output of a sidechain to be correct it must be al E fed back to the channels it is derived from Pressing an SC link button will therefore illuminate the p corresponding CV link button and lock it on Most compressors apply gain reduction based entirely on the signal level at their inputs A level detector examines the input and drives an output VCA that is assumed to have a complimentary response a feed forward system The 8051 uses a feedback topology monitoring the output of each gain cell and continually adjusting the control voltage returned to give the required gain reduction This means that the control voltage linking has to follow sidechain linking to maintain a closed loop Once this feedback is in place the sidechain output can be linked to other channels using the remaining unlit CV link buttons These channels then follow the same dynamic envelope as the SC Linked channels but without their audio content affecting the compression A channel may also have control voltage linked from both sidechains In this case the sidechain providing the most gain reduction at any moment controls the channel and the greater of the two gain makeup settings will be applied o CV LINK 1A Audio to O P level trim SIDECHAIN A 9 TIMING CONTROLS lt SC LINK 1A SIDECHAIN AUDIO PATH CV LINK 2A Audio In Audio to O P TXF level trim The CV Link buttons are disabled un
16. ternally connected to the CV Link switched for routing back to the channels In EXT mode the control voltage is taken from the rear connector instead of the sidechain outputs allowing the unit to be slaved from a second 8051 or 33609 There is no EXT Control with 88R S console mounted compressors AM5052 amp AM5265 To CV Link switches SIDECHAIN A S TIMING CONTROLS _ g 8 g 3 S SIDECHAIN B d TIMING CONTROLS Pin Function 1 OV Reference 9 CV send sidechain A 12 Remote power on 5 CV send sidechain B 13 CV return sidechain B 14 CV return sidechain A 15 24V Reference Shor to pin 12 to pin 1 to take the unit out of standby mode remotely CONTROL eng KEY INPUT INPUT 6 INPUT 5 INPUT 4 INPUT 3 INPUT 2 muon sup Ssss INPUT VOLTAGE 100 250V AC INPUT FREQUENCY 47 6342 Page 9 8051 5 1 Compressor Threshold User Guide GAIN REDUCTION Ya i d 20 4s 8s EN A i 23 6 1 23 SN LJ AKE UI Z9 Nur N e UANG 181 E 12 CP RECOVERY MAKE UP 8 GAINdB 151 12 EJ THRESHOLD dBu RECOVERY Threshold Level H 3 E of t LEVEL OUT LEVEL IN Gain Makeup Ratio Issue 2 Gain Makeup LEVEL OUT LEVEL IN LEVEL OUT LEVEL IN Threshold is the level above which compression begins Each channel linked to a sidechain using the SC Link buttons takes that sidechain s threshold If a channel is linked
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