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Reduction in volume by splitting RCA

Audio/Visual Club - Ars Technica OpenForum - arstechnica.com
To distribute the sound from the Roku and Blu-Ray player to the SONOS speakers around the house without a delay between the HT speakers and the wireless SONOS speakers, I use a lip-sync corrector to delay the HT speakers by 100ms. In addition, I added a passive switch to bypass the lip-sync corrector when I do not need to play the sound through the SONOS speakers to avoid the slight delay between sound and video. With the switch in the following position (lip-sync corrector bypassed), I experience a significant reduction in volume vs. connecting the pre-outs of the Denon receiver directly to the Sphinx. There is no such reduction in volume when the switch is in the opposite position (passing through the lip-sync corrector). In my mind, it's counterintuitive that there would be a drop in voltage somewhere in the depicted configuration. Can anyone explain why this is happening?


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