Class-beating acoustic comfort 

Laminated side windows for on-board silence
Laminated side windows filter out wind noise and exterior noise to provide high-level acoustic comfort. They also contribute to the security of the Citroën C6, which has gained a five-star rating from Thatcham.
The laminated side windows with reinforced acoustic insulation are made up of two sheets of glass, assembled using plastic films of excellent acoustic properties. This system absorbs sound vibrations over a wide range of frequencies, offering an excellent level of performance in terms of sound insulation.
Made of glass and plastic, these windows are virtually impenetrable. This prevents injury in the event of breakage, as well as providing a barrier to stop people or objects from being thrown out of the car in the event of an accident. It also offers efficient protection against vandalism and break-ins. 

Insulation: a key factor in acoustic comfort
Alongside the laminated side windows, other features also contribute to interior soundproofing, such as the dash cowl, active engine mounts, and the hydro-elastic mounts of the rear cross-members.
Outstanding acoustics and vibration control create a peaceful atmosphere in the cabin, for the pleasure and comfort of both driver and passengers.
For this reason, each car undergoes testing on a track simulating various extreme conditions (cobbled areas, bumps, etc.) to make sure that all the functions (acoustic comfort, suspension comfort, etc.) are up to standard. 

Excellent thermal comfort
High-performance air conditioning
The pleasure of driving and travelling is indissociable from the exceptional thermal comfort enjoyed by all passengers. The C6 features fully automatic air conditioning.
This two-zone system provides individual comfort for occupants at the front. The driver and front passenger can modulate the temperature and air flow independently.
At the rear, a relay blower lets passengers adjust the air flow and create a uniform temperature more rapidly. 

Soft diffusion
The C6 is fitted with a soft diffusion system.
This system is designed to create a uniform blanket of air around the passengers, providing exceptional thermal comfort with no draughts. This ensures a less aggressive air flow, with the air being diffused through the front air vents and rear blower.