Reserving internet bandwidth for Sonos?

Our downstream ADSL bandwidth is approx 6 mbps, which usually fine for Sonos. Problems only happen when other family members (OK, the kids) are watching YouTube, playing PlayStation, etc, which can cause music drop outs. My ADSL router allows me to reserve a minimum amount of bandwidth for a given IP address, but which IP address should I reserve bandwidth for to enable Sonos to get what it needs? My setup is:

- ADSL router hard wired to Sonos:Bridge
- 2 Play:1 players connected to Sonos:Bridge by Sonosnet Wifi
- 2 Play:3 players connected to Sonos:Bridge by Sonosnet Wifi

Here is the info from About System in the PC controller:

Associated ZP: 192.168.1.52
---------------------------------
PLAY:1: Bedroom
Serial Number: 00-0E-58-CF-90-A4:8
Version: 7.3 (build 36442130)
Hardware Version: 1.8.3.7-2
IP Address: 192.168.1.62
WM: 0
OTP:
---------------------------------
BRIDGE: BRIDGE
Serial Number: 00-0E-58-1F-60-82:5
Version: 7.3 (build 36441270)
Hardware Version: 1.5.0.0-2
IP Address: 192.168.1.53
WM: 0
---------------------------------
PLAY:3: Dining Room
Serial Number: 00-0E-58-FF-39-52:6
Version: 7.3 (build 36442130)
Hardware Version: 1.8.1.2-2
IP Address: 192.168.1.54
WM: 0
OTP:
---------------------------------
PLAY:1: Kitchen
Serial Number: 00-0E-58-CF-90-C2:4
Version: 7.3 (build 36442130)
Hardware Version: 1.8.3.7-2
IP Address: 192.168.1.52
WM: 0
OTP:
---------------------------------
PLAY:3: Sitting Room
Serial Number: 00-0E-58-FD-02-2E:F
Version: 7.3 (build 36442130)
Hardware Version: 1.8.1.2-2
IP Address: 192.168.1.55
WM: 0
OTP:

If I configure the ADSL router to reserve, say, 2 mbps of downstream bandwidth for the Bridge, will that allow any player to get the data it needs? I.e. does the data all get fetched by the bridge and then routed on the LAN to each player? Or does each separate player fetch its own data over the WAN?