WBS MLC8A User manual
MLC8A
MULTICHANNELLEVELCONTROL
byWardBeckSystems
Rev:Oct.012014
Unpacking:
Please inspect the unit carefully to ensure that damage had not occurred during
shipping.
Report any damage immediately to the factory, note if there is any obvious damage to
thepackaging.
The unit is supplied with a full complement of Phoenix™3pin pluggable connectors
installed in their mating sockets. DB multipin type connectors and BNC connectors are
notsupplied.
Astandard3pindisconnectIECpowercableisincluded.
Installation:
TheMLC8Amountsinastandard19inchrackandoccupiesonerackunitofspace.
Connections to the unit are made on the rear panel. Please note that the 25pin DB
male connector labelled AUX is used to connect the analog outputs. The 9pin DB
female connector labelled SERIAL COMM is an RS422 control port for connection to an
external controlling device such as the MLC8R remote panel. Please refer to the rear
panel layout diagram and the detailed connector diagram for connectors AUX and
SERIALCOMM.
The MLC8A is factory calibrated to operate at the nominal level of 20dBFS = 0. Other
operating nominal levels (such as 18, 14, 12 dBFS) may be set provided it is specified
atthetimeoforder.
USINGTHEMLC8A
The MLC8A is designed to display the levels of multiple audio signals in a surround
sound environment (5.1 + 2) and to provide acoustic mixing of these signals with overall
globallevelcontrol.
All connections to the unit are made on the rear panel and all displays and operating
controlsarelocatedonthefrontpanel.
Eight bargraph displays on the lefthand side show the level of the incoming signal. The
factory setting for the bargraph meters is 20dBFS = 0. The bargraphs display the
incominglevelofthe5.1+2signals.
The MLC8A accepts, 75 Ohm, unbalanced, or 110 Ohm, balanced AES audio signals.
The operator must switch the input selector between the balanced and unbalanced AES
signals. The cluster of four LED illuminated push buttons labelled (PRESET) 1, 2,
(MODE) 5.1 and ST in conjunction with the pushpush control in the MASTER level
control are used to make the input source selection. To make the selection,
simultaneously depress PRESET 1, 2 and the MASTER knob until both PRESET 1 and
2 LEDs illuminate and release the buttons. Either the 5.1 or ST button will be
illuminated. 5.1 represents 75 Ohms while ST represents 110 Ohms. Operating these
buttons will toggle between the 75 and 110 Ohm AES sources connected to the
MLC8A.
NOTE: The selection function will time out and the buttons will revert back to their
normalfunction.
The eight rotary level controls labelled L, R, C, LFE, LS, RS, L and Rare used to adjust
the level of the individual signals being fed to the output of the MLC8A. These rotary
controls are equipped with concentric array of LED indicators that show the
proportionate value of the signal. Each rotary control incorporates a pushpush switch
that instantly mutes that signal. When muted the concentric LEDs extinguish except for
the highest level LED which flashes to indicate the mute condition. The MASTER level
control adjusts overall level of the proportional mix set by the eight individual level
controls. The MASTER level control also incorporates a pushpush switch. Activating
thisswitchmutesalleightchannels.
It is possible to store two proportionate mixes in the MLC8A. Once the desired mix is set
push and hold a PRESET button until the concentric level indicator LEDs flicker,
(approximately five seconds) and the mix will be stored under that button. To recall a
setuppresstheappropriatePRESETtheconcentriclevelindicatorLEDsflicker.
The 5.1 and ST MODE buttons allow toggling between full 5.1 and stereo only
monitoring. When the ST MODE button is pushed inputs one through six (AES 1, 2 and
3) are disconnected the seventh and eighth channels (AES4) are switched to the inputs
1 and 2 controls. This allows the operator to listen to the ST L and ST R on the L and R
monitorspeakers.IntheSTmodetheC,LFE,LSandRScontrolsaredisabled.
MLC8RRemotePanel
The MLC8R Remote Panel permits secondary control of the MLC8A from a remote
location. Controls and displays on the MLC8R mimic those on the main unit and status
changescanbeeffectedfromeitherlocation.
The MLC8R mounts in a standard 19 inch rack and occupies one rack unit of space.
The unit is equipped with a single DB 9(M) connector for interfacing to the main MLC8A
unit.
MLC8ACONNECTORLAYOUTS
MLC8ACONNECTORASSIGNMENT
MLC8AINTERCONNECTCABLE
SPECIFICATIONS
ANALOGOUTPUT
FrequencyResponse
1.5dBufrom20Hzto20kHz
Impedance
60ΩBalanced
MaxOutput
23.5dBu
Noise
Lessthan70dBu
THD
Lessthan0.05%
ConnectorType
DB25male
AES/EBUINPUTS
Impedance
75Ωunbalanced&110Ωtransformerbalanced
Level
0.2to7Vpp
MaxInput
0dbfs
Standard
AES31D1995
Type
BNCFemale&3PinTerminalBlock
AES/EBUOUTPUTS
Impedance
75ΩUnbalanced&110Ωtransformerbalanced
Level
2.5Vppterminated
Output
0dbfs
Noise
Lessthan100dbfs
Standard
AES31D1995
THD
Lessthan0.001%
Type
BNCFemale&3pinTerminalBlock
MONITOROUTPUT
FrequencyResponse
1.5dBufrom20Hzto20kHz
Impedance
60Ωbalanced
MaxOutput
23.5dBu
Noise
lessthan70dbfs
THD
Lessthan0.05%
ConnectorType
3pinTerminalBlock
POWER
Input
90230VAC,5060Hz
WardBeckSystemsLtd.reservestherighttochangeperformancespecificationswithoutpriornotice.
WARRANTY
All WardBeck Systems Ltd. products are warranted against defective materials and
workmanshipforaperiodofoneyearfromthedateofshipment.
WardBeck Systems Ltd. will repair or replace, at its option and without charge, all said products
or parts thereof which upon factory inspection prove to be defective during the warranty period,
providedthat:
1. Theoriginalserialnumbersareintactandhavenotbeentamperedwith.
2. The purchaser shall return any equipment or parts thereof to WardBeck Systems Ltd.
only after obtaining prior authorization and shipping instructions from the factory.
(WardBeck Systems Ltd. reserves the right to inspect or repair equipment on the
purchaser’spremises).
3. The purchaser assumes the obligation for all expenses in connection with the shipping
andreturnofsuchgoods,onceauthorizationhasbeenobtained.
Thiswarrantydoesnotcoveritemsnormallyconsideredexpendable,suchasfusesandlamps.
This warranty does not cover damages caused by misuse, accident, neglect, unauthorized
alteration, repair by unauthorized personnel, or damage caused by an act of God, war, or civil
insurrection.
In no event shall WardBeck Systems Ltd. be liable for consequential damages. WardBeck
SystemsLtd.shallhavetherightstofinaldeterminationastotheapplicationofthiswarranty.
WardBeck Systems Ltd. reserves the right, at any time and without notice, to make changes in
its equipment, components, specifications or designs, as may be warranted by progress in
stateofthearttechnology.
WardBeck Systems Ltd. reserves the right to make design changes, additions to, and
improvements in its products, without obligation to install such revisions in products previously
manufactured.
The warranty set forth herein is in lieu of all other warranties expressed or implied, including the
warrantiesofmerchantabilityandfitness.
WARDBECKSYSTEMSLTD.
945MiddlefieldRoad,Unit9,Toronto,OntarioM1V5E1
V4163355999F4163355202TollFree8007712556
Website:www.wardbeck.com
EMail:sales@wardbeck.com
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