When you own a car from a brand that is often used as a superlative term, it would be expected that the quality of musical entertainment within would also be superior. This was clear in the brief for Bespoke Audio for the Rolls-Royce Phantom: to integrate studio quality audio into a motorcar.
Indeed, the men and women who created Bespoke Audio for the brand’s flagship benchmarked the system against a recording studio’s playback room rather than systems created for automotive applications. However, configuring an audio system for a car is significantly more challenging than creating an audio system for a static, purpose-built facility because external disruptions such as road surfaces, wind buffeting and ambient noise corrupt audio quality dramatically. Therefore the team at Rolls-Royce built the environment the audio system was destined for in tandem with the audio system itself.
The Architecture of Luxury
Only the Architecture of Luxury, the marque’s proprietary spaceframe, could allow the brand to meet its brief. Aluminium was selected as it has a higher acoustic impedance than steel, reducing external noise entering the cabin. Further optimising the material’s acoustic properties is the construction technique; engineers eschewed traditional methods, instead introducing extrusions and complex internal structures to both improve the rigidity of the motor car and minimise flat, resonant surfaces.
The largest ever cast aluminium joints in a body-in-white and double-skinned bulkhead and floor sections better insulate sound; measures that both isolate external noise and optimise the performance of sound inside the cabin.
The designers also gave the acoustic performance of the bass speaker special consideration at the architectural stage. Exceptional low frequency performance is engineered into the very fabric of Phantom as it incorporates a resonance chamber into the body’s sill section; the frequency response of the Bespoke Audio speaker component defined the chamber’s size and shape. In essence, the car itself is a subwoofer.
World’s most silent automotive soundstage
In addition, the Phantom is equipped with 6 mm thick acoustically dampened glass, which combines double-glazing with infrared and UV protection and high-strength laminated safety glass. 130 kgs of dense, high-absorption sound insulation is installed throughout the car – in the headliner, doors and boot cavity – to drastically reduce reverberation.
Rolls-Royce also worked closely with its tyre partner to invent ‘Silent-Seal’ tyres, which feature a specific foam layer placed inside the rubber carcass that reduces overall tyre noise by 9 decibels compared with a standard alternative. When a Rolls-Royce acoustic test engineer first reviewed results road and vibration tests, the sound levels were so low that he asked to check that the measuring instruments were calibrated correctly. They were and Rolls-Royce lays claim to the Phantom being the most silent car in the world.
State-of-the-art optimisation technology
A powerful amplifier controls 18 channels (one for each speaker), providing a 1,300-watt output. State-of-the-art optimisation technology and high precision magnesium-ceramic compound speaker cones enable near-infinitesimal changes in sound with an outstanding frequency response.
Two active microphones in the cabin also enable an adaptive function, detecting the absence or over emphasis of frequencies before triggering the amplifier to adjust the loudness of certain frequency ranges to counteract it. The Bespoke Audio system makes the most of the highest quality, uncompressed dynamic rate music providing an exceptional listening experience.
But to finely tune the Bespoke Audio system required the most sensitive of ‘instruments’ – the human ear. This helps to judge the more intangible, subjective elements of audio, such as timbre, pace and responsiveness.
Thousands of kilometres are driven to ensure Rolls-Royce Motor Cars’ systems are the very best, listening to a wide range of music – from house to heavy metal, and trap to techno. Only when the engineers can truly ‘visualise’ musicians playing around them do they sign off the sonic delivery. These factors contribute to a uniquely Rolls-Royce standard of sound for customers, many of whom are themselves musicians and will settle for nothing less than perfection.
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