SONOS SUB (GEN 2) Failed

Main Logic/Amplifier PCBA

The Gen 2 Sub utilizes an integrated logic and amplifier board that manages the 5GHz ad-hoc radio link to the Arc soundbar. A failure in the wireless NIC section of this board allows the device to power on and be discovered via BLE, but prevents the high-bandwidth audio bonding required for output. This results in the 'Failed' status during the final handshake phase of setup.

Sonos Arc

The Arc acts as the DHCP master and wireless coordinator for the dedicated 5GHz surround/sub network; if the Arc's internal radio module is compromised or the 'Enable Wi-Fi' setting is toggled off, it cannot initialize the link to the Sub. Forensic evidence suggests many pairing failures originate from the master controller's inability to broadcast the 5GHz SSID for the Sub to join.

Dual-Band Wireless Router

Network layer conflicts, such as IP address exhaustion or IGMP snooping settings on the local router, can block the initial handshake tokens between the Sonos App and the hardware. If the router fails to correctly route the UPnP discovery packets, the Sub will appear 'offline' or 'failed' despite having functional hardware.