8051 User Manual (Issue 2) - AMS Neve

Issue 2 Page 68051 5.1 Compressor User GuideSidechain LinkThe sidechain link buttons route audio from each channel's sidechain audio path into one or both ofthe sidechain timing circuits. If a single channel's SC LINK A or B button is pressed, that channel willbehave as a mono compressor.If another channel is then linked to the same sidechain, the timing circuit responds to whicheverchannel is larger at any moment (taking into account the setting of the SC trim controls). Theresulting control voltage is then applied equally to both channels, i.e. they behave as a stereo linkedcompressor.Sidechain FilterInserts a high-pass filter in the channel's sidechain path, preventing unwanted compression due toLFE content. The response is 12dB/octave, shelves at -20dB (this is required to maintain thesidechain's phase margin) and has a selectable -3dB frequency of 80, 100, or 120Hz.

Issue 2 Page 78051 5.1 Compressor User GuideControl LinkWhile the SC link buttons control the audio inputs toeach sidechain, the CV link buttons choose wherethe D.C. control voltage generated by eachsidechain is routed. The CV link buttons alsodetermine which gain makeup control affects eachchannel, in the same way that the SC link buttonsassign the threshold controls.For the output of a sidechain to be correct, it must befed back to the channels it is derived from. Pressingan SC link button will therefore illuminate thecorresponding CV link button and lock it on.80Hz80Hz1000151/201510012015120NeveIN/OUT0155/60151534SC TRIMS dBIN/OUTEXTACTRLEXTBCTRL15151122FILTER TO CHANNEL3BYPASS1 2 3 4 5 6MSIDECHAIN LINK1 2 3 4 5 6A A A A A A1 2 3 4 5 6B B B B B BMST3CONTROL LINK1 2 3 4 5 6A A A A A A1 2 3 4 5 6B B B B B B4SIDECHAIN FILTER45566Most compressors apply gain reduction based entirely on the signal level at their inputs. A leveldetector examines the input and drives an output VCA that is assumed to have a complimentaryresponse (a 'feed-forward' system). The 8051 uses a feedback topology, monitoring the output ofeach gain cell and continually adjusting the control voltage returned to give the required gainreduction.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 theremaining unlit CV link buttons. These channels then follow the same dynamic envelope as the SCLinked channels, but without their audio content affecting the compression.A channel may also have control voltage linked from both sidechains. In this case the sidechainproviding the most gain reduction at any moment controls the channel, and the greater of the twogain makeup settings will be applied.The CV Link buttons are disabled unless either a channel or the key has been routed to theassociated sidechain, or when in external mode.

Issue 2 Page 88051 5.1 Compressor User GuideSC Trims and ThresholdThresholds for each channel are determined bysidechain path gain which is applied in two stages.The two main threshold controls are first assigned toeach channel with the SC Link buttons, providing abase threshold level for each of the sidechains. TheSC Trim controls then allow threshold adjustmenton individual channels of ±15dB, irrespective ofhow they are linked. The trims are grouped as twostereo pairs (channels ½ and 5/6) and two monos(channels 3 and 4).Once above the sidechain's threshold level, the linkbutton for the largest signal on that sidechain (afterthe threshold gain has been applied) illuminatesred. Any signal that is above threshold and within2dB of the dominant signal will also illuminate.80Hz80Hz1000151/201510012015120NeveIN/OUT0155/60151534SC TRIMS dBIN/OUTEXTACTRLEXTBCTRL15151122FILTER TO CHANNEL3BYPASS1 2 3 4 5 6MSIDECHAIN LINK1 2 3 4 5 6A A A A A A1 2 3 4 5 6B B B B B BMST3CONTROL LINK1 2 3 4 5 6A A A A A A1 2 3 4 5 6B B B B B B4SIDECHAIN FILTER45566

Issue 2 Page 98051 5.1 Compressor User GuideEXT ControlThe EXT buttons provide an insert point in the control voltage signal, after the bias control but beforerouting back to the channels.During normal operation the control voltages generated by the sidechain are internally connectedto the CV Link switched for routing back to the channels. In EXT mode the control voltage is takenfrom the rear connector instead of the sidechain outputs, allowing the unit to be slaved from asecond 8051 or 33609.There is no EXT Control with 88R(S) console mounted compressors (AM5052 & AM5265).PinFunction1 0V Reference9 CV send, sidechain A12 Remote power-on5 CV send, sidechain B13 CV return, sidechain B14 CV return, sidechain A15 24V ReferenceShort to pin 12 to pin 1 to take the unit out of standby mode remotely.CONTROLVOLTAGE I/OKEY INPUTPUSHINPUT 6PUSHINPUT 5PUSHINPUT 4PUSHINPUT 3PUSHINPUT 2PUSHINPUT 1PUSHWARNINGDISCONNECT MAINS LEADTO ISOLATE UNIT.NO USER SERVICEABLEPARTS INSIDEHAZARDOUS VOLTAGES INSIDEREFER TO MANUALSCHASSIS INTERNAL0VPLEASE SEEMANUALOUTPUT 6OUTPUT 5OUTPUT 4OUTPUT 3OUTPUT 2OUTPUT 1FUSE 1.6A A/S CERAMICINPUT VOLTAGE 100-250V ACINPUT FREQUENCY 47-63Hz

Issue 2 Page 128051 5.1 Compressor User GuideKey InputA Key Input is provided to allow adjustable control from an externalsource. Like the sidechains the key input has a threshold levelcontrol ranging from -20 to +16 to set the intended level at whichcompression control is required.It can be used in several ways: Injecting tone to provide a remotely variable base-level ofcompression on one or both sidechains. 'Ducking' from an audio source such as dialogue.ABKEY I/PSIDECHAINSELIN/OUTPOWERAB100HzA/B0BIAS121684-20 +16THRESHOLD dBuOUTPUT LEVEL dB080514812DISCRETEMULTI-CHANNELCOMPRESSOR When connected in parallel with one of the inputs, it allowsthat input to be routed onto both sidechains with differentcompression thresholds.-5.50Key FilterThe key input is provided with a selectable 12dB/octave high-pass LFE filter, fixed at 100Hz.Bias ControlThe bias control is used to balance the control voltages from the two sidechains by applying up to6dB 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 controlallows ratio values between the standard settings to be selected with continuously variable control.Output LevelThis control provides a variable active pad across all six outputs, from 0dB to -5.5dB in 0.25dBsteps. The pad is outside of the relay bypass loop and so always controls all six channels together inorder to maximise the unit's output level without clipping.PowerThe power switch is illuminated dim red when the mains is present to indicate that the unit is instandby mode. While in standby all switches are disabled, switch settings are retained and the unitconsumes minimal power.Pressing the power switch brings the unit out of standby (power switch illuminates green). Pressingand holding returns it to standby mode.The unit can be brought out of standby remotely by connecting pins 1 and 12 on the rear panelD-Type connector.

Mastering Compressor Controls (AM5292)The 8051 Mastering Compressor is slightly different to the standard 8051 in 2 ways: It has 21 position detented pots for the Trim and Bias controls to aid total mechanicalrecall of the unit. It has -1dB switches fitted to the Threshold and Gain Make-Up controls to allow for moreaccurate settings, for example, in a mastering application the entire range of the switchescan be turned from 2dB steps into 1dB steps by the selection of the -1dB switches.8051 5.1 Compressor User GuideIssue 2 Page 13111IN/OUTIN/OUTEXTACTRLEXTBCTRL222333444555666AABBAABBAABBAABBAABBABB1 2 3 4 5 61 2 3 4 5 61 2 3 4 5 61 2 3 4 5 6A100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETEOUTPUT LEVEL dBFILTER TO CHANNELCONTROL LINKSIDECHAIN LINKSIDECHAIN FILTERBYPASSSC TRIMS dB100100120120808031/245/600001010101010101010Neve100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE0-5.5ABA/BBIAS0POWERKEY I/PAB100Hz8dB401216208dB40121620100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETETHRESHOLD dBuTHRESHOLD dBuTHRESHOLD dBuMAKE-UPGAIN dBMAKE-UPGAIN dBRATIORATIOATTACKATTACKRECOVERYRECOVERYGAIN REDUCTIONGAIN REDUCTIONAB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE100100120120808000001010101010101010Neve 0-5.508dB401216208dB40121620AB-10-10+20+202ms2ms4ms4ms6ms6ms8ms8ms16ms16ms-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sDISCRETE-20-20-20+16+16+161.5:11.5:12:12:18888888888121212121212121216161616164444444444000003:13:14:14:16:16:1maxmax.1s.1s.2s.2s.4s.4s.8s.8s1.5s1.5s3s3sSIDECHAINSELIN/OUT8051MMULTI-CHANNELCOMPRESSORDISCRETEMSTHzHzM-1dB-1dB-1dB-1dB21 PositionDetented Pots-1dB Switches

Issue 2 Page 148051 5.1 Compressor User Guide8051 Compressor - 88R(S) Console mounted AM505210080120HzIN/OUT1FILTER TO CHANNEL2 3 4 5601515151/200BYPASS5/601515151534SC TRIMS dBIN/OUT10080120HzMST1M2 3 4 5 615SIDECHAIN LINK1 2 3 4 5 6B B B B B B1 2 3 4 5 6A A A A A ASIDECHAIN FILTER1 2 3 4 5 6CONTROL LINK1 2 3 4 5 6B B B B B B1 2 3 4 5 6A A A A A AA4 0 408 4 84B12 8 12816 12 1612-20 +16 4 -20+1648 8THRESHOLD dBu0 THRESHOLD dBu012 124 416 168 8-10 +20 -10+203:1 4:1 MAKE-UP3:14:12:1 6:1 GAIN dB2:16:1MAKE-UPGAIN dB1.5:1 Max1.5:1MaxRATIO4ms2ms6ms8ms16msRATIO4ms2ms6ms8ms16ms.4s .8s .4s.8s.2s 1.5s ATTACK.2s1.5sATTACK.1s 3s.1s3sRECOVERYRECOVERYGAIN REDUCTIONGAIN REDUCTION481216481216020020dBdBOUTPUT LEVEL dBA B0A/BBIASSIDEKEYIN/OUT CHAINSELI/PA B100Hz408412816125.5 0-20 +16THRESHOLD dBu2 TRACK MIXER0 - 0 - 040 40 40 40 - -- 0 +10ON ON ON ONPOSTINS2T TOMON1-2(L-R)3(C)4(S)5-6(LS-RS)2TOUTPUTAs this unit is designed for fixed 5.1 compressor applications in an 88R(S) console the EXT ACTRL and EXT B CTRL controls are not selectable (blank buttons).

Issue 2 Page 158051 5.1 Compressor User GuideI/O Wiring (AM5052 & AM5265)56 Way Free Plug VariconSignal Signal Name Pin NumberHi Lo Scn1 1 Left Input C J D2 3 Centre Input P V K3 2 Right Input U Z d4 4 S Input Y c f5 5 LS Input s m j6 6 RS Input x t n7 1 Left Output CC y JJ8 3 Centre Output MM HH NN9 2 Right Output B F A10 4 S Output L R E11 5 LS Output S W a12 6 RS Output X b e13 Key Input r l h14 v p k15 z u DD16 LL EE KK

Issue 2 Page 168051 5.1 Compressor User GuideSpecificationsI/OThe key input and LFE filter inputs are electronically balanced with an input impedance of 10kohms.All other inputs are transformer balanced with 3.6kohms input impedances.All outputs are electronically balanced post the output transformers, with maximum output of+26dBu into 600ohms. The unit is calibrated for bridging loads greater than 10kohms.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 PerformanceEquivalent input noise (20kHz band):< -78dBuTHD+N (for 20dBu input @1kHz): < 0.03%Maximum Output Level:Interchannel Crosstalk:> 26dBu into 600 ohms< -80dB at 15kHzControlLFE Filter:Sidechain & Key Filters:Threshold:Make-up gain:12dB/octave low-pass, -3dB frequency selectableto 80Hz, 100Hz or 120Hz.12dB/octave high-pass, -3dB frequency selectable to80Hz, 100Hz or 120Hz.-20dBu to +16dBu master control, with ±15dBtrims on all channels.-10dB to +20dB.Ratio: 1.5:1, 2:1, 3:1, 4:1, 6:1, MAX (~8:1).Attack:2ms, 4ms, 6ms, 8ms and 16ms.Release: 100ms, 200ms, 400ms, 800ms, 1.5s and 3s.Output Level Trim:0dB to -5.5dB pad, in 0.25dB steps.

8051 5.1 Compressor User GuideIssue 2 Page 17