Hello @owain_thomas & @Joe_Strain,
@owain_thomas, to answer your question, the difference between these two settings in terms of Bluesound at the moment would be wether Sample Rate Conversion/Upsampling would be allowed to be applied to the stream. If you select “Renderer only”, Sample Rate Conversion will not be applied to MQA streams.
@Joe_Strain, to answer your question, setting the device to “Decoder and Renderer” will cause Roon to not use it’s built in Core Decoding when playing an MQA stream without DSP enabled. Since the Bluesound does not recognize the un-decoded MQA stream when playing from Roon, you would only be playing at the 1x 44.1/48 kHz rate instead of the decoded MQA 2x rate of 88.2/96 kHz.
-John