In the past I have been using a wireless lav for interviews recorded directly to my DSLR (Canon 60D). I recently switched to a double audio system using my Zoom H4.
One suggested setup was to channel the wireless lav directly to the Zoom then to split the headphone audio out of the Zoom to both the headphones and the DSLR audio for reference. However, this means the DSLR audio level changes if the headphone volume is adjusted.
If instead I split the audio coming out of the wireless lav to both the Zoom and DSLR audio (Rather than splitting the output of the headphone jack), then the audio levels could be adjusted appropriately and wouldn't change. Will that degrade the audio quality? Is that recommended?