Thank you for writing in!
You can certainly use the disc changer if you have a dual stereo female RCA to 1/8" stereo male adapter. You would just then connect to the AUX port on the SoundTouch 30. I would not recommend sitting the SoundTouch 30 on the top of the disc changer as it doesn't have the necessary grooves on the bottom to align properly with the disc changer.
Let me know if you have any further questions!
Tony A - Community Support
Thanks for reaching back out!
Since we no longer manufacture a multi-disc changer any longer, you would want to search third party such as Sony or Onkyo for a robust multi-disc changer. The other option you can pursue is possibly a small laptop stand that would create a platform above the disc changer so you can rest the SoundTouch 30 over.