How to implement both 2D and 3D spatial audio effect in one room?

Greetings,

I'm using Photon Voice and have implemented 3D spatial audio effect by setting "Audio Source -> Spatial Blend" of Speaker to 1. Now I want to have one player in the room who can hear every other user's voice without moving close to them. But how can I implement this feature while not influencing 3D spatial effect?

I'm using Unity 2019.4.11 & Photon Voice 2.22.2
The setting of Photon Voice is the same as suggested in the tutorial: https://doc.photonengine.com/en-us/voice/current/getting-started/voice-for-pun#suggested_workflow

Thanks in advance!