Once you've imported your podcast to Omny Studio, you can easily migrate to Omny Studio without losing your existing subscribers. All you need to do is tell iTunes and the other podcast directories and apps to pull from your new RSS feeds. This is done by applying a re-direct from your old feed to your new feed.
If you've uploaded episodes to your old host since your initial import to Omny Studio, please follow this guide to re-sync your feed with Omny before applying a re-direct.
To move from Podbean:
1. Log into your Podbean account
2. On the same browser, go to http://www.podbean.com/podcast-new-feed-url. If you’ve got multiple channels, you may select one from the list.
3. Copy and paste your Omny RSS feed into the “New Feed URL” text box
4. Click "Save".
Podbean will now redirect your feed to Omny Studio.
Note: Although iTunes will normally pick up on changes within a few days, you should leave the old feed in place for a few weeks to ensure all subscribers are moved across.