Hi alan716
The Sonos Bridge never controlled your Play 3 speakers. The bridge only created the SonosNet to replace your home Wi-Fi signal. The SonosNet can be created by a Sonos speaker wired to your router including the Play 3.
However, if placement is an issue (meaning it would be inconvenient to wire the Play 3) you can purchase the Sonos Boost module ($99-USD) to replace the bridge.
Regarding this comment of yours...I recently purchased a Sonos Amplifier to connect with my stereo receiver and in-ceiling speakers.
- If you were trying to integrate a receiver with say a TT that is connected to it you would not need a Sonos Amp. A Sonos Port would be the go to product.
- If you are trying to drive in ceiling speakers then you would need a Sonos Amp.
If I have missed something please clarify. Cheers!