You can restrict admins from listening to recordings in specific campaigns. If you wish to make sure they are not able to listen to a specific campaign, please follow the steps below.
From the Dashboard, click on Account and select Users from the drop-down.
In Show Users Section, click on Action and select Settings.
Click on the Data Access Level Tab and scroll down to Campaign Access Level Section.
In Campaign Access Level
- Select the Campaigns from Cannot Access Campaigns box and select the directional button.
- Make sure that the Campaigns you wanted to include are in Can Access Campaigns.
- If you want to move ALL Campaigns, click on ASSIGN ALL button.
Note: If "No Restrictions" is checked, the user is automatically assigned to all existing and future campaigns and there is no need to add them to the campaigns anymore. 
Scroll Down and click on Apply Changes
When this Manager tries to listen to recordings, he will only see the list of recordings in the campaign he's assigned to.