Crest_Audio_Century_Series_LMx_Owners_Manual电路图.pdf

CENTURYSERIES OWNERSMANUAL LMx RadioFans.CN 收音机爱 好者资料库 Congratulations on your purchase of a Century Series console. All of us at Crest Audio in Paramus, New Jersey, USA, support your decision, knowing your console contains the finest combination of design and manufacture in the industry. While your new Century Series console is one of the most feature-packed available, great effort has been put into making it simple to operate. This manual explains the functions of your new console, how they operate and how they relate to each other. If properly cared for, your new console will provide you with trouble-free, sonically accurate mixing clear into the next Century and beyond. Please keep the following contact information on hand: Crest Audio Customer Service Dept. 100 Eisenhower Drive Paramus NJ 07652 USA tel 201.909.8700 fax 201.909.8744 Crest Audio Inc. 100 Eisenhower Dr., Paramus NJ 07652 USA TEL: 201.909.8700 FAX: 201.909.8744 Printed in USA RadioFans.CN 收音机爱 好者资料库 Feature Overview2 A brief description of the LMx design, features and functions. System Connections3 Contains diagrams illustrating conventional system connections. Wiring Conventions5 Contains diagrams indicating how connectors for Crest consoles are wired. Power Supply6 A brief description of the rack-mountable Century Series consoles power supply. Power Connections7 A brief description of Crest console power connections. Console Cooling7 A brief description of the dual-fan cooling setup. Input Module8 Profiles the LMx input module. The module and rear panel are illustrated and described. Group Module10 Profiles the LMx group module. The module and rear panel are illustrated, and described. Stereo 21R/22L Module12 Profiles the LMx console stereo 21R/22L module. The module and rear panel are illustrated, and described. Master Module14 Profiles the LMx console master module. The module and rear panel are illustrated, and described. Meter Bridge16 This section profiles the LMx meter bridge. Each type of meter is illustrated and described. Operation18 Describes special features: Global Level/Pan, Solo system, Monitor outputs, Stereo Input, Channel Input Mic split, Line Inputs, Sub-grouping. Technical InformationAppendix A Includes dimensions, specifications, console access details, user options, console block diagram, and rear panel layout. GlossaryAppendix B The specific details of console operation are described here, alphabetically. SchematicsAppendix C Lists available LMx console and power supply schematics. TABLE OFCONTENTS PAGE1 LMx LMx LMx LMx LMx LMx LMx LMx LMx LMx LMx LMx LMx LMx LMx RadioFans.CN 收音机爱 好者资料库 Feature Overview SSM/PMI High quality devices on balanced microphone/line inputs and on all outputs for uncompro- mised audio quality and reliability. All ICs within the audio path are socket mounted for easy upgrade or service. A signal path completely free of electrolytic capacitors; all internal audio connections are gold plated. Pad switches on XLR inputs allow preamplifiers to accept signals from -62 to +7 dBu on mic and -44 to +10 dBu line. Separate 1/4 insert send and return jacks are provided for patching outboard equipment. Passive microphone splitters with ground lift switches on every microphone input. Switchable 48 Volt phantom power on all microphone inputs; optional transformers available on all microphone inputs and primary outputs. EQ section includes an EQ ON switch with LED and a 100Hz High Pass filter switch. Four sweepable bands (LF-40- 800Hz, LMF-100Hz-2kHz, HMF-400Hz-8kHz, HF-1.5k- 20kHz) are supplied with bell curves, providing full frequency control with generous overlap. The HF and LF bands are selec- table between Peaking and Shelving via internal jumpers. 5-LED display on input modules, logically placed next to the fader, provides accurate monitoring of pre-fader input lev- els. Input channels have level sends for the 22 output buses, with dual concentric controls provided for buses 1-16 and sin- gle controls for buses 18-20 and 21L/22R. These controls may function as either 11 stereo sends with level and pan, 22 dis- crete mono sends, or any desired combination of the two modes. Global mono or stereo configuration for each bus is determined by pushing a single button on the corresponding output module. FET-controlled “soft” Mute switches on each input mod- ule, which cut every selected send and output. Each input may be assigned to any or all of the eight Mute Groups, and assign- ments are clearly indicated by associated status LEDs. Engaging the Safe switch defeats the modules group mute function without changing the console setup. Output EQ - Each of the Group Output modules incorpo- rates a dedicated stereo EQ section with three overlapping swept bands (40Hz - 1kHz, 300Hz - 8kHz, 1kHz - 20kHz ), odd return only active when insert on. Send 1/4, balanced, -2dBu Return 1/4, balanced, -2dBu Not shown: Group Output VU meters (Odd green = compression; red = gating. MASTER LEVEL pot Sets the Stereo feed audio level for groups 1 thru 22. MUTE switch with indicator for the Stereo Input. SIGNAL indicator Bi-color signal level indicator showing audio level pre-fader and pre-dynamics processor. Mono sum of L for 21L balanced pin 2+. Minimum recomm. load impedance 600 Output levelnominal = +4dBumax = +28dBu 21Left (Odd) pre-fader return active only when insert on. STEREO MIC IN R Balanced XLR input, 4 k input impedance, +48V phantom power available. Not shown: Output VU meters 21 off to +10dBu. PINK NOISE switch and indicator Changes the test signal from sine wave to pink noise. ON switch with indicator Controls the output from this section. TB ON switch with indicator. Master switch for talkback and oscillator outputs to the Group modules. This is a smart-switch; Press+hold for momentary use; tap to lock on, tap again to cancel. TB LEVEL pot Adjusts the audio level of talkback and oscillator to the Group modules. EXT TB IN switch with indicator Mixes incoming audio into the talkback route via the level pot. The XLR input is suitable for high level balanced audio lines. Ext TB In is active all the time that EXT is switched on. This path bypasses the local TB ON switch. EXT TB OUT switch with indicator Connects local TB/Osc audio to the rear output connector. Ext TB Out is active only when the master TB is ON. TB/Osc output XLR provides bal- anced audio at about -20VU. MUTE GROUP MASTERS 1 - 8 Eight illuminated mechanically-latched switches, each controlling one of the common mute group buses. To enable a mute group press the switch, which then lights up. Now any channels assigned to that mute group number will mute. (contd) Channels may be un-muted three ways: 1) Cancel the master mute (press the switch again); 2) Deselect the channel from the mute group; 3) press the channel SAFE switch. Mute Groups work on the active bus principle. Channels pre-selected to the bus only mute when the master mute is on (switch lit). While the bus is MASTERLMX STR MIC IN L IN EXT TB OUT LEFT ALT MON RT LEFT MONITOR RT LMX PAGE15 CENTURYSERIES active channels can be added or removed freely and the appro- priate muting is immediate. Operator Monitor Section PHONES control Level pot for control of both stereo headphone output sockets. (One is located on the master module, and another is under- neath the front right end of the console armrest.) Internal high power amps to suit all headphone types. Headphone outputs are solo, or follow the monitor source selectors (Ext source, Fader mix, Sum Mono) and are indepen- dent of all other monitor pots and switches. Note the PHONES ON/OFF switch below. OPTION: Phones follow Monitor fader. Refer to OPTIONS section. ALT MONITOR level pot and switch With bi-color indicator. Control the secondary stereo 1/4 bal- anced operator monitor output. Normally output is a duplicate of MAIN monitor, unaffected by Monitor fader movements. Alt Monitor may be configured several ways, refer to OPERA- TIONS and OPTIONS. MAIN MONITOR output on-off switch with indicator Controls audio output from rear panel balanced XLR connec- tors. Monitor audio source is SOLO with a choice of back- ground-default audio when no SOLO is active. See Monitor Source below. SOLO ACTIVE indicators Identify the location of active SOLO selections. OUTPUT refers to SOLOs on the 22 group mix sections. INPUT refers to all Input Channels, plus Line In sections of Group modules and Stereo Input section of the Stereo module. SOLO CONTROL switches with indicators LAST PRESSED: choice of normal additive solos or auto-can- celling operation (new cancels old). INPUT PRIORITY: choice of either: Normal Operation:equal priority everywhere Input Priority:Input Solo overrides Group CLEAR: cancels all solo selections. Console automatically clears on power-up. SOLO TYPE switch and indicators PFL=pre-fader, stereo paired. AFL = post-fader, stereo paired. ALT SLAVE MODE switch the footpedal provides hands-free downward changes in level. Connect the footpedal included with the console to the 1/4- inch jack below the power connector at the rear. The footpedal is a custom design, having a passive 20k pot connected as a potential divider between tip (cw) ring (wiper) and sleeve (ccw) at the 1/4 jack. Use only the Crest-supplied footpedal. Master Module Rear Panel Monitor Left however, low frequency loud- speakers in particular are vulnerable to the full output levels that phantom power mismanagement can produce. If prob- lems occur turn down the output and check all connections. Temporary damage can occur to any audio transformers in the line when phantom power is disturbed by grounding one phase. While the short persists, the sound is grossly distorted. After removal of the short circuit, sound quality may be affected by residual magnetization of the transformer core, especially noticeable on high levels. If the sound quality does not return to normal replace the transformer and have it demagnetized. GROUP LINE INPUTS The audio for the LINE IN sections of the group modules comes from the 1/4 connectors for channel line inputs. The audio is buffered and split internally on each input channel. Channel Line Input 1 is split to Group Line In 1 .etc to Channel Line Input 20 and Group Line In 20. Line Input Mixing The LINE INPUT dual concentric level pot on each output module controls the level of incoming audio to the Odd and Even number mixes in the module. Inputs 1 leave Odd R and Even R unas- signed. Use the On-Off switch to control the Group submix added to the L-R mix. With this switch OFF, the Group submix is turned off; only the sends from channels to 21L and 22R are heard. Appendix A Technical Information LMx LMX APPENDIXA CENTURYSERIES General Specifications - LMx Console The following are the technical specifications for the Century LMx console. Frequency Response (referenced to 1kHz)+0.0, -0.5dB, 20Hz to 20 kHz Total Harmonic Distortion (Mic input to Group output) 20Hz to 20 kHz at +15dBu100 dB Channel Fader Attenuation 85 dB Input/Output Impedances Mic Input4k balanced Line Input10k balanced Outputs120 balanced Input/Output Levels (0VU = +4 dBu, 1.23V RMS) Mic Input Sensitivity+ 4 to -62 dBu Line Input Sensitivity+ 12 to -38 dBu Input Insertion Point Level+ 4 dBu Output Insertion Point Level+ 4 dBu Nominal Output Level4 dBu Maximum Balanced Output Level+28 dBu Configurations The Century LMx Console is available in the following con- figurations: Architects EQ On ; Mute (solid-state soft turn-on); Solo; Mute Scene select 1-8; Mute Scene Safe. There shall be 4-band EQ, each band having +/- 15dB vari- able gain and adjustable filter center-frequency. The ranges shall be: LF 40-800Hz; LM 100Hz-2kHz; HM 400Hz-8kHz; HF 1.5k-20kHz. Five segment channel signal level LED indicators and overload indicator shall be provided. Each channel shall have a total of 22 independent sends to the Group Outputs; eight being dual concentric rotary controls (sends1-2,3-4,.15-16) and six single rotary controls (sends 17-22). Seven Pre switches with indicators shall control the choice of Pre or Post fader audio source. These switches shall be grouped as follows: sends 1-4, 5-8, 9-12, 13-16, 17-18, 19-20, and 21L-22L. Each send level pair may be configured dual mono or stereo operation by a single global Level/Pan switch associated with each output pair. Channel output level shall be con- trolled by a 100mm travel slide fader. The output section shall contain ten Group Modules, each providing two Group Outputs, each output including: mix Insertion send and Return connections; 100mm fader; balanced output with XLR connector; bi-color signal indicator and electro-mechanical VU meter. Each Group shall have switches with indicators for Solo; Mute; Dim; Phase Reverse; Talkback Enable; Insert Solo; Insert On- Off. Each pair of Group Outputs (an individual Group module) shall include: the Global Level-Pan master selector, with indicator; three bands of stereo output EQ with variable frequency and gain; independent EQ In-Out selectors with indicators; high pass filter with variable frequency from 20Hz to 400Hz and independent In-Out selectors for each out- put. For each Group there shall be independent Level controls and On-Off switches from L and R to each Group. Any or all signals on the 20 Group buses shall be assignable to the L-R Stereo mix. These two subgroup modes shall be interlocked to prevent inadver- tent feedback loops. In addition each Group module shall include Level, Pan and On-Off controls from the Master Stereo Input. Each Group shall include Level, Solo and On-Off switches with indicators from the corresponding Channel Line Input. One Stereo Output module shall provide Group Outputs 21L and 22R, each with Insertion Send and Return connections; 100mm fader; balanced output with XLR connector; bi-color signal indica- tor and electro-mechanical VU meter. Each Group shall have switches with indicators for Solo; Mute; Dim; Phase Reverse; Talkback Enable; Insert Solo; Insert On-Off; and there shall be one Global Level-Pan master selector for sends 21L while the outer knob controls the cen- ter frequency adjusted by the inner knob. These center frequen- cies are printed on the chassis around the outer knob. This EQ is active only when the EQ In switch is depressed. Equalizer Controls (Output) Controls the equalization of the output mix signal through three bands, via six controls. The upper knob of each band determines the center frequency (high-1kHz-20kHz, mid- 300Hz-8kHz, low-40Hz-1kHz), while the lower knob adjusts the amount of boost or cut. External Talkback Input In addition to the mic connections on the console surface, an additional Talkback input connection is provided on the rear of the master section. Signal connected to this jack appears on the Talkback bus whenever the External TB Input switch is depressed. External Talkback Output This allows the TB signals from the local mic only to be routed to an external destination such as