BMW Radio and Information Systems Bedienungsanleitung PDF herunterladen (Seite 15)

Communications

Audio systems

The following audio systems are available for the E85:

• HiFi audio system

• Top-HiFi audio system

New features

For the first time at BMW, binding audio standards have been defined for the E85 which will

also be adopted in successor models. In addition to the minimum requirements relating to

the systems, Carver speaker technology is used for the first time worldwide in a motor vehi-

cle (Top-HiFi audio system). This system achieves substantial improvements in the low fre-

quency range.

The audio standards stipulate the following requirements:

• Classification in 2 audio systems: HiFi and Top-HiFi

• Symmetry of sound field: All systems ensure uniform distribution of the sound field in the

vehicle and convey the overall acoustic impression that the source of the music is in

front of the driver and passenger.

• Sound pressure

• Linearity of stereo signal

With the aid of the Carver speaker technology, high sound pressures can be achieved

although there is only a low resonance volume (space behind the speakers) available in the

roadster.

System comparison - sound pressure

The sound pressure in the vehicle is the measure for establishing the total volume up to

which distortion-free sound reproduction is possible.

The higher the sound pressure the greater the volume. When the sound pressure is

increased by approx.10 dB, the volume is subjectively doubled.

1. Top Hi-Fi

2. HiFi

3. Stereo

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BMW Radio and Information Systems Bedienungsanleitung Seite 15