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Nexus Unite U74, User Manual

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Unite U74 Audio Amplifier User Guide 

Unite_U74_UG_01_120421.docx 

Page 13 of 19  

 

Stereo BTL 

In this configuration Left and Right source signals are routed as mono BTL signals and 

single 8Ω speaker 

are used for each pair. 

The zone configuration for this is: 

 

 

 

The negative (-) speaker terminals 

must

 be left unconnected. 

The speaker wiring for this mode is as follows: 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8Ω

 

Left 

 

8Ω

 

Right 

Summary of Contents for Unite U74

Page 1: ...Unite U74 Audio Amplifier User Guide Unite Audio Nexus Audio Video Pty Ltd 15 19 Villas Road Dandenong South Victoria Australia 3175 ...

Page 2: ...tents Introduction 3 Installation 3 Equipment 3 Amplifier Front Panel Features 3 Amplifier Rear Panel Features 4 Web Interface 5 Amplifier Configuration 6 Settings 9 Amplifier Use 14 Rear Panel Layout 17 Specifications 18 Document Revision Details dd mm yy Inits Rev A Initial Release 12 04 21 DJA ...

Page 3: ...nputs 1 and 2 and stereo Inputs 3 4 and 5 analog signal Inputs and stereo Speaker outputs An S PDIF digital audio signal may also be connected to Input 6 Equipment Model U74 Amplifier Loudspeakers Signal sources Internet connection Web browser Chrome Firefox Edge Vivaldi etc Interconnect cables Amplifier Front Panel Features The U74 amplifier can be controlled from the front panel There are four m...

Page 4: ...s includes Power internet hardware controls signal Source inputs and Zone speaker outputs Basic Connections Make sure the amplifier mains switch is in the Off O position before making any connections Connect mains power to the mains input socket Connect Source signal sources to the Inputs as required Connect Zone speakers to the Speaker Outputs as required Connect the amplifier to the internet via...

Page 5: ...evels of access User and Manager Manager access is required for Configuration and Control while User only allows Zone volume control Login Record the IP address of the amplifier as shown on the front panel display Option1 Enter the following address into your Web browser most browsers http unite local Option2 If the browser does not connect using option1 method then enter the IP address into your ...

Page 6: ...nfigured via web browser prior to use in a new installation Manager credentials are required for this process The parameters that need to be set include the following Sources Input gain setting Sources 1 and 2 Volume settings Volume Limit Volume and Balance Equalisation settings High HighMid Mid LowMid and Low Unite Bass The amplifier also can also have its Zone type configured and Zones and Sourc...

Page 7: ...anged to suit a particular installation The defaults are Zone1 Zone2 Zone4 Zone6 for 6 Zone variants The ON icon next to the Zone name MUST be ON Blue for the Zone to be enabled and active If the Zone is not enabled the ON icon will be greyed out as shown below To select a particular Source for a given Zone select it directly from the SOURCE selection boxes Note that the Source names can be change...

Page 8: ... 19 In the example shown above Source 1 has been selected For the selected Source the Amplitude settings need to be configured This includes the Volume that is also able to be set via the front panel controls In a similar manner the Equalisation for the Zone may be configured ...

Page 9: ...figuration of the amplifier This setting is only required if the amplifier zones and speaker setup is changed during installation The Connected Device will show the MAC of the target device This can be verified from the front display panel with the last 4 digits of the ID field Click the Read button to show the amplifier s current Zone Configuration ...

Page 10: ...s Output Configurations The U74 amplifier can be configured in a variety of mono or stereo Single Ended or mono or stereo Bridge Tied Load formats It is also possible to mix zone modes Mono In basic mono configuration each speaker output is an independent mono signal and each connects to a separate speaker The zone configuration for this mode is Volume and Tone controls are independent for all 8 z...

Page 11: ...120421 docx Page 11 of 19 Stereo In this configuration Left and Right source signals are treated as a stereo pair and separate Left and Right speakers are used The zone configuration for this is The speaker wiring for this mode is 4Ω Left 1 3 Right 2 4 4Ω ...

Page 12: ... of 19 Mono BTL In this configuration Left and Right source signals are downmixed to mono and a single 8Ω speaker is used The zone configuration for this is The negative speaker terminals must be left unconnected The speaker wiring for this mode is as follows 8Ω Left Right ...

Page 13: ... BTL In this configuration Left and Right source signals are routed as mono BTL signals and single 8Ω speaker are used for each pair The zone configuration for this is The negative speaker terminals must be left unconnected The speaker wiring for this mode is as follows 8Ω Left 8Ω Right ...

Page 14: ... and source controls are available The User cannot change other settings These settings need to be configured by a Manager Front Panel Status and Control The U74 has a 2 5 inch full colour status display and four rotary push controls for user control over basic operation This includes setting Volume of Zone Source for Zone Set Power Controls Off Each press of a control knob will change which of th...

Page 15: ...is the default screen and control following power up Each front panel control has direct control over its respective zone Rotate the controls clockwise to increase the Zone s volume counterclockwise to decrease Zone Source Push any control once to advance from the Set Volume mode to Set Source mode Rotate the controls to select the active Source for each Zone ...

Page 16: ...unction to disable Zones muting them and powering them down Each Zone can be individually powered down Rotate the Zone s control clockwise to activate counterclockwise to power down Control Off This function disables all controls to prevent accidental adjustment Press any control again to re activate ...

Page 17: ...19 Rear Panel Layout The diagram below shows the rear panel layout of the U74 amplifier Mono Mic or Line Inputs 1 and 2 Stereo Line Inputs 3 to 5 Digital Input 6 Speaker Outputs 1 to 4 Mute and PTT inputs 1 and 2 USB Input LAN Power Switch Fuse IEC Mains Input Socket ID Switch ...

Page 18: ...ndby Power 115Vac 4 2W 230Vac 7 8W Fuse Rating T3AL Time Lag 115Vac 5A 230Vac 3A Ambient Temperature 0 to 50C Maximum Humidity 85 Non Condensing Maximum Altitude 2 000m Cooling Fan forced thermostatic control USB 5Vdc 0 5A Output power 0 1 THD N 20Hz f 20kHz single Zone RL 8Ω BTL 160W RL 4Ω SE 80W Zones 4 x Stereo or BTL Mono Sources 2 x Mic Line XLR or plug 3 x Stereo RCA 1 x S PDIF RCA 1 x USB D...

Page 19: ...te_U74_UG_01_120421 docx Page 19 of 19 36 72 x 48 96 W x H Active Display Area Status Indication 3 x Status LEDs Power boot status Network connection status Alert status Control 4 x rotary push encoders Mic input Phantom Power 12 24 or 48Vdc ...

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