See the images above for examples of optical and coaxial connections. External devices always output ADAT as an optical signal, however some external devices output S/PDIF in optical format while other devices output S/PDIF in coaxial format. All Apollo models (except Apollo 16) feature optical ADAT input, however some Apollo models feature coaxial S/PDIF input while other models feature optical S/PDIF input. We commonly get questions about using different digital input types with different Apollo models. Combo jacks accept all standard XLR and 1/4" TRS connectors. These combo jacks combine an XLR and 1/4" TRS connection into a single jack to save space. These combo jacks may look a little bit different than your standard XLR or 1/4" TRS connections however they function just the same - when connecting via XLR set the corresponding input channel to MIC, and when connecting via 1/4" TRS set the corresponding input channel to LINE. Most Apollo models (except Apollo FireWire and Apollo 16) use combo jacks for their XLR and 1/4" TRS connections. The image below shows a Console input channel in Hi-Z mode:Ĭonsole input channel set to Hi-Z (for 1/4" TS input via front panel) While a 1/4" TS cable is plugged into a Hi-Z input, the corresponding XLR and 1/4" TRS connections for that input channel cannot be used. When you plug in a 1/4" TS cable to an Apollo Hi-Z input, that input channel automatically switches to Hi-Z and cannot be switched to MIC or LINE until the 1/4" TS cable is removed from the Hi-Z jack. On all Apollo models (except Apollo 16) the Hi-Z input(s) on the front of the device are intended for use with 1/4" TS connections. The image below shows two Console input channels set to LINE in order to accept signal from the 1/4" TRS connections:Ĭonsole input channels set to LINE (for 1/4" TRS input)ġ/4" TS is generally only used for Hi-Z connections such as electric guitar or bass. 1/4" TS connections should be avoided for line level signals. If you have your input set to LINE but are connecting via XLR, or if you have your input set to MIC but are connecting via 1/4" TRS, that would cause no input to show on the Apollo.ġ/4" TRS should be used for all line level signals when possible. When a particular input on an Apollo interface is set to LINE the Apollo takes signal from the 1/4" TRS connection corresponding to that channel. When connecting via 1/4" TRS you will always need to set the corresponding Apollo input to "LINE". The image below shows two Console input channels set to MIC in order to accept signal from the XLR connections:Ĭonsole input channels set to MIC (for XLR input) If you have your input set to MIC but are connecting via 1/4" TRS, or if you have your input set to LINE but are connecting via XLR, that would cause no input to show on the Apollo. When a particular input on an Apollo interface is set to MIC the Apollo takes signal from the XLR connection corresponding to that channel. When connecting via XLR you will always need to set the corresponding Apollo input to "MIC". See below for an explanation of the physical input connections on Apollo interfaces and how to configure the Apollo for each input type. Not getting any signal into your Apollo interface? If you don't see any signal registering on the front panel input meters of your Apollo, the problem may be related to how you're connecting your input device and how you have the Apollo's corresponding input configured.
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