I would just get smaller conventional passive speakers and a Bluetooth transmitter to your current system. If your aim is not only to save space with smaller speakers but also eliminate the space dedicated to amplification, then get small powered speakers and make sure that they have a digital input for your CD player. I am imagining that small powered speakers exist that contain an internal Bluetooth receiver. If not, make sure that the powered speakers also have an input for the external Bluetooth receiver.
You referenced your lack of knowledge with audio terminology. Technically your current setup isn’t analog since CD players are digital sources. If your source was a turn table, tape player, or non-digital tuner, it would be an analog system.
Regarding Sound Quality (SQ), with small speakers and Bluetooth you will have music to enjoy but from an Audiophile Perspective it’s not going to cut the mustard. I therefore wouldn’t get caught up with worrying about Bluetooth codecs as your system probably wouldn’t be able to allow you to appreciate any differences.
I hope this was helpful and I didn’t intend my comments to be snarky, but rather informative