If you are intending to send audio from your cinema 30 to the iFi so that you can listen to the content produced through the cinema 30, you will need to use the RCA from the cinema 30 to the can 3. There’s no way to get a balanced signal from the cinema 30 to the can 3 because this cinema 30 has no balanced output. You cannot connect from RCA output to balanced input.
To get a safe, pristine signal from the Marantz to the iFi, you should utilize the RCA Inputs located right on the back of the iFi Zen Can 3.Use a standard RCA-to-RCA stereo cable.
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Plug one end into the Zone 2 (or Zone 3) Pre Out on the back of the Marantz. Both outputs function perfectly for sending an independent or mirrored 2-channel stereo mix to an external headphone amp.
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Plug the other end into the RCA inputs on the back of the iFi.
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Press the input selector button on the front of the iFi until the RCA input LED lights up.
Do You Lose Balanced Performance?
Not at all. You do not need a balanced input signal to get the benefits of a balanced headphone output.
The iFi Zen Can 3 features an internal circuit topology that takes the single-ended RCA input and converts it into a balanced architecture before it reaches the internal amplifier stages. As long as you plug your headphones into the 4.4mm balanced headphone jack on the front panel, you will still get the maximum power, voltage, and fidelity the amplifier has to offer.
Audio Routing
In the Marantz AVR settings under Zone Setup, configure the selected zone volume to “Fixed” rather than “Variable.” This passes a clean, full-strength line-level signal to the iFi Zen Can 3, allowing you to control the listening volume entirely via the iFi volume knob.
However, in order for you to down mix a multi channel signal, such as an HDMI signal from a Blu-ray player to stereo out of the zone 2, you can do the following:
The Marantz Menu Fix (Configure Once)
You can set the receiver to automatically downmix the incoming HDMI audio specifically for your Zone output:
1. Open the Marantz Setup Menu on your screen.
2. Go to General > ZONE2 Setup (or ZONE3 depending on which one you plugged the iFi into).
3. Find the setting called HDMI Audio and change it from Through to PCM.
What this does: When this is set to PCM, the Marantz will grab the multi-channel HDMI audio from the Blu-ray player, downmix it to a high-quality 2-channel stereo signal inside the receiver, and send it directly out to your iFi amplifier.
One Catch: When you set “HDMI Audio” to “PCM” in the Zone settings, if you happen to have the Main Zone speakers turned on at the same time and playing the exact same Blu-ray, your main home theater speakers will also drop down to 2-channel stereo. But since your plan is to turn the speaker feed off anyway when using your headphones, this setting is the perfect solution for your setup.