Large rooms bigger than approximately 20m² (eg. a lounge or kitchen/dining room) will benefit from the better bass response, higher power handing, and wider dispersion of speakers with larger drive units.
The following in-ceiling speakers feature 8" drive units or bigger for maximum performance in larger spaces. The total number of speakers required for a large or open plan space will depend on the area and room layout. A medium sized lounge maybe sufficient with a pair of 8" speakers, whereas an open plan kitchen/dining area would likely require 4 speakers for good coverage and best performance.
PLEASE NOTE: When connecting multiple speakers of this type to a stereo amplifier you must use an even number of speakers. Typically a stereo amplifier can drive 2 or 4 speakers. If the amplifier has sufficient power then it may be able to drive 6 speakers, but to ensure safe load matching, we would always recommend that this is done via a speaker switch.