29INSTALLATIONSelect one or all of these systems:1. Connect an external amplifier to the Zone 2 Audio Outputs.See Figure 42.Figure 42 – Zone 2 Audio OutputsIt is recommended that you place the amplifier in the same roomas the AVR 3550HD so that a shorter length of interconnect cableis used with a long run of speaker wire to the remote room. A longrun of interconnect cable would be subject to signal degradation.Depending on your amplifier, distribute the audio signal to a singlepair of speakers, or to several pairs placed in different rooms.The Zone 2 Audio Outputs offer the benefit of 7.1-channel in themain room simultaneously with multizone operation. However, thebenefit is achieved with the expense of an additional component,i.e., the amplifier.2. Connect the remote room’s speakers directly to the SurroundBack/Zone 2 Speaker Outputs. See Figure 43.Figure 43 – Surround Back/Zone 2 Speaker OutputsReassign the Surround Back amplifier channels to power the speakers(see page 48). However, your main system will be limited to 5.1 chan-nels, affecting playback of programs recorded in 6.1 or 7.1 channels.3. Connect an external amplifier to the Surround Back/Zone 2 PreampOutputs. See Figure 44.Figure 44 – Surround Back/Zone 2 Preamp OutputsThis method requires an additional amplifier, but may increase thenumber of remote rooms when used with methods 1 and 2.4. Connect an A-BUS hub or other A-BUS components to the A-BUSPort. See Figure 45.Figure 45 – A-BUS PortUse Category 5/5e cable as described in the instructions for yourA-BUS components. The A-BUS system carries the audio signal tothe remote components, while receiving IR control codes. A hub maydistrubute audio to many remote rooms. To control source devicesexclusively from the remote A-BUS module, connect the AVR’s A-BUSIR Output to a compatible IR input on the source. This frees up theAVR’s other IR outputs for special applications. IR commands receivedfrom the A-BUS system are also distributed to the AVR’s other IRoutputs. Visit the Web site at www.harmankardon.com for informationon available Harman Kardon hubs, the ABH 4 and ABH 4000, andamplified in-wall modules, the AB 1 and AB 2.For methods 1, 2 and 3, connect an IR control device to the Zone 2 IRInput for remote-room control of the multizone system, source devicesand volume in the remote zone. An A-BUS system does not require aseparate IR control connection.NOTE: Only analog audio sources are available to the multizonesystem.Step Eleven – Turn On the AVR 3550HDTwo steps are required the first time you turn on the AVR 3550HD.1. Flip the rear-panel Main Power Switch to the “ On” position. The PowerIndicator on the front panel will turn amber, indicating that the AVRis in Standby mode and is ready to be turned on. See Figure 46.Normally, you may leave the Main Power Switch on, even when thereceiver is not being used.Figure 46 – Power Switches2. There are several ways to turn on the AVR from Standby mode.a) Press the Standby/On Switch on the front panel. See Figure 46.b) Using the remote, press the AVR Power On Button or any of theSource Selectors. See Figure 47.AVR 3550HDAVR 3550HD