What’s the difference between a standalone CD player and an all-in-one audio system?

A standalone CD player is a dedicated device designed solely for playing CDs, offering high-quality audio output. In contrast, an all-in-one audio system combines multiple components such as a CD player, amplifier, radio tuner, and sometimes speakers into a single unit. While convenient, all-in-one systems may sacrifice some audio fidelity for compactness and versatility.