When Rolls-Royce turned its attention to the Cullinan Series II, acoustic technicians encountered challenges unique to two-box SUV profiles. A limousine like the Phantom isolates its rear passengers from the trunk via an upholstered steel bulkhead. The Cullinan features a spacious open cabin volume where acoustic standing waves can bounce between the windscreen and the rear tailgate glass.
To counter these spatial reflections, the Cullinan Series II relies on an upgraded 18-channel amplifier outputting 1,400 watts. Active digital signal processing divides specific low-frequency duties across two specialized subsystems:
- High-Excursion Transducers in the Floor Structure: Positioned low within the chassis, these drivers couple directly to the aluminum sill audio cavity. By pressurizing the sills rather than the interior air directly, the system generates clean low-frequency reinforcement down into sub-audible octaves. Occupants perceive bass through tactile body conduction as well as hearing it through the air, creating a grounded sensation without acoustic bloat.
- Dynamic Phase Calibration: The amplifier's digital signal processor monitors cabin acoustics in real time. Because the Series II offers versatile seating configurations, ranging from rear bench seats to individual lounge chairs with a fixed center console, the DSP adjusts transducer delay profiles to keep bass waveforms aligned across every seat.
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