Volume Really Low

[fingerblastj]

First let me list all the components:

1. (8) sonos devices, (6) of which are sonos connect amp, (2) sonos connect
2. Basement sonos is connect, connected to onkyo 636 receiver
3. Onkyo 636 connected to tv via hdmi with 7.1 in wall polk audio 8" speakers with 1 polk audio sub
4. Basement connect is connected via rca cable into 1 of the input on receiver
5. Both my iMac & basement connect are hardwired into my network
6. My iMac is running 10.12.2 beta (16C63a)
7. Network is 50 up 50 down

My issue is this:

It took me forever to get this up and running. i noticed that different node versions have different results with airsonos. For example, node 4 with give an error when looking for all sonos devices on the network. Node 10 with have the search not pull up any devices. Node 5 finally allowed me to select any of my sonos devices and works.

Now that i have it up and running, i wanted to test it in the basement where it will be predominantly used since my iMac is set up there as well. However, the volume is extremely low when i play a youtube video. i have the receiver volume way up, the iMac at 100% as well as sonos at 100%.

When i say low, when i have either the tv or sonos playing through those speakers and receiver, have it at 20% is blasting.

i know that many people trying this work around don't have the same configuration as i do which leads me to believe that everyone is having a different experience, as i noticed in every forum I've been reading.

Does anyone else have this issue?

Does anyone know of a fix for the very low volume?

Any help is much appreciated