Marshall's passive speakers are speakers that do not have their own built-in amplification, and therefore require a separate amplifier to power them. Passive speakers are typically used in a variety of sound reinforcement and professional audio applications, such as in live music venues, clubs, and theaters.

On the other hand, Marshall's active speakers are equipped with their own built-in amplification, which means they do not require a separate amplifier to power them. Active speakers are often preferred by musicians and audio professionals because they are more portable and easier to set up than passive speakers, which require additional equipment such as an amplifier and cables. Active speakers are also known for their high performance and clarity, making them ideal for a wide range of audio applications.