An active speaker doesn't require an external amplifier to power it as it has a suitable and light weight amplifier module in built.
A passive speaker does require an external amplifier to power it.
Which Is Best?
There is no definitive answer as both active and passive loud speakers have their pro’s and con’s depending on the venues requirements. The venue
would need to be surveyed to determine which system will be most effective
A loudspeaker can be mounted in a number or different ways depending on
structural surroundings. They can be mounted on the wall using the correct brackets, suspended from the ceiling using safety cables, they can be suspended from trussing or ground stacked.
Is more better? To a point yes however there are many other factor that should be taken into consideration when evaluating a speakers limits. For example the frequency response, the SPL level, the internal components, the speaker cabinet materials, speaker dimensions and the list goes on... The wattage rating doesn't necessarily mean the speaker is going to be louder than a lower rated speaker, this is because many cheaper speakers are inefficient at turning power into decibels. This is where the SPL (sound pressure level) rating comes in, SPL is measured in decibels and this figure gives a more accurate indication as to how loud the speaker is.
What is an amplifier?
An amplifier is responsible for amplifying an audio signal and powering multiple passive speakers.
This is an amplifier that typically has a lower power rating than a stereo amplifier but has a greater number of controllable outputs. This is ideal for a venue with different zones in which the user would like to control the volume levels of independently.
This typically has more than 2 output channels so a greater number of speakers can be powered from a single unit. This makes it ideal for saving space as you won’t need several amplifiers. It also has most of the same features as a typical stereo amplifier.
Rack mounting is a great way to organise your equipment to save space and provide a more user friendly set-up. Rack mounting comes in many different shapes and forms depending on the equipment and use. For example there are floor standing cabinets, wall mountable cabinets, cases and the list goes on. All cabinets/cases can be fitted with tamper proof locks and face plates.