Extron electronic MPA 401 manual

Page 14
NOTES:

Controlling multiple amplifiers with one volume controller

Several MPA 401 units can be daisy-chained so that one volume controller can simultaneously regulate the volume of all the amplifiers.

NOTES:

•As additional amplifiers are added to the daisy chain, the sensitivity of the volume potentiometer will change. The maximum volume level (fully clockwise) will not be affected. However the effectiveness of the minimum volume level (fully counterclockwise) in reducing the volume to inaudible levels decreases as more amplifiers are added to the daisy chain.

•When more than two MPAs are attached to the chain, sound may begin to be heard even if the levels have been set to their lowest. The muting of the output however can be remedied with a contact closure button attached between the Vol/Mute and Ground pin of the first MPA in the chain.

To regulate multiple amplifiers with a single volume controller, follow these instructions:

1.Attach all three pins of the volume controller to the corresponding pins on the first MPA 401 unit only (ground to ground; Vol/Mute to Vol/Mute; and 10 V to 10 V).

2.Use jumper wires to connect the Vol/Mute pins of the first amplifier and each successive amplifier.

3.Use jumper wires to connect the ground pins of the first amplifier and each successive amplifier.

Extron

Extron

VCM 100 AAP

MPA 401

 

daisy chain

VOL/MUTE

10V

REMOTE

10V Manual background 50mA

V

C

G

REMOTE

10V Manual background 50mA

V

C

G

REMOTE

10V Manual background 50mA

V

C

G

OR

 

VOL/MUTE

10V

50mA

 

VOL/MUTE

10V

50mA

 

VOL/MUTE

10V

50mA

Figure 5. Regulating Multiple Amplifiers with a Single Volume Controller

NOTE: The 10V pin of the volume controller connects to the first MPA 401 only. There are no jumper wires linking it to subsequent amplifiers.

MPA 401-70V and MPA 401-100V • Rear Panel and Cabling

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Contents User Guide MPA 401 SeriesMini Power Amplifiers AudioChinese Simplified（简体中文） Safety InstructionsSafety Instructions English Instructions de sécurité FrançaisFCC Class B Notice Notifications Specifications AvailabilityConventions Used in this Guide Introduction ContentsSetup and Operation Rear Panel and CablingMPA 401-70Vand MPA 401-100V Contents MPA 401-70Vand MPA 401-100VFeatures Important Safety InstructionsImportant Safety Instructions IntroductionMPA 401-70Vand MPA 401-100VDescription Figure 1. Typical Application for the MPAMPA 401-70Vand MPA 401-100VFeatures MPA 401-70Vand MPA 401-100V IntroductionRear Panel and Cabling Rear Panel Power Input Audio InputsRemote Input Connector Speaker Connections Rear PanelPower Input Audio Inputs Wiring for remote control Remote Input PortPage Speaker Connections Front Panel Features Setting Input Level Setup and OperationFront Panel Features Setting Bass and Treble Remote Control OptionsSetting Input Level Setting Bass and TrebleExtron MPA Remote Control OptionsMPA 401-70Vand MPA 401-100V Setup and Operation Extron SI 3CT LPAmplifier Enters Standby Mode Too Early TroubleshootingAmplifier Fails to Exit Standby Mode Promptly Reference Material Plenum PlacementTabletop Placement MountingRack Mounting Procedure Under-desk, Through-desk,and Projector MountingExtron Warranty
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