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Audio systems: E87, E90, E91, E92
The audio systems are divided into 3 groups: .
- Stereo system
- HiFi system
- Top-HiFi system
The audio systems differ in the number of loudspeakers, the acoustic pressure that can be generated and by
enhanced system linearity.
The bass loudspeakers are located under the front seats.
The Top-HiFi system has an integrated 7-channel graphic equaliser and Surround Sound (Logic7).
Stereo system
4 channels
6 loudspeakers
•
2 mid-range loudspeakers, front 100 mm
•
2 mid-range loudspeakers, rear, 100 mm
•
2 bass loudspeakers, 160 mm
Bandwidth: 50 Hz to 14,000 Hz
Max. acoustic pressure 98 dB
Amplifier power: depends on radio,
radio: 4 x 15 W (4
M-ASK: 4 x 40 W (2
CCC: 4 x 25 W (2
Ω
)
Ω
)
Ω
)
With the stereo system, the loudspeakers are actuated directly by the audio output stages in the radio or navigation
system, without additional amplifiers. The stereo loudspeaker system is fitted as standard, provided a radio or
navigation system is fitted.
The mid-range loudspeakers in the front doors and the bass loudspeakers are controlled on each side by a
common audio output stage in the radio or navigation system. The loudspeaker wire is split in the vehicle's A-pillar.
From here, the signal is fed separately to the loudspeakers. In order to protect the radio's audio output stages from
overloading through the loudspeakers, which are connected in parallel, a capacitor is connected in series to the
front mid-range loudspeakers.
The capacitor acts as resistance to the alternating current, and changes its value according to the frequency. The
lower the frequency, the greater the resistance. This means that the total resistance (impedance) of the bass
loudspeakers, capacitor and mid-range loudspeakers is in an uncritical range for the audio output stage.
The audio output stages of the "Business" (M-ASK) and "Professional" (CCC) navigation systems can control two
loudspeakers connected in parallel. The capacitor for adjusting resistance is therefore not necessary.
HiFi-System (option 676)
6 channels
10 loudspeakers
•
2 treble loudspeakers, front 26 mm
•
2 mid-range loudspeakers, front 100 mm
•
2 bass loudspeakers, 217 mm
•
2 mid-range loudspeakers, rear, 100 mm
•
2 treble loudspeakers, rear 26 mm
Bandwidth: 40 Hz to 20.000 Hz
Max. acoustic pressure: 104 dB
Amplifier power:
2 x 40 W (2
4 x 25 W (2
SBT Audio systems: E87, E90, E91, E92 BMW AG - TIS 04.03.2008 14:22
Issue status (08/2007) Valid only until next DVD is issued Copyright Page - 1 -
Ω
) Bass
Ω
)
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The analogue 6-channel HiFi amplifier can be operated with every radio or navigation system offered. The HiFi
amplifier is located in the rear left of the luggage compartment behind the luggage compartment trim. The audio
signals are transferred to the HiFi amplifier in analogue form. The HiFi amplifier amplifies the signals and sends
them to the loudspeakers. In total, 10 loudspeakers can be controlled via 6 audio channels.
The treble loudspeakers and mid-range loudspeakers are connected in parallel. They are each supplied by the four
amplifier output stages via a common wire. At the mid-range loudspeaker there is a diplexer (high pass) that
decouples the signal for the treble loudspeaker. The diplexer takes the form of a capacitor. With a higher frequency
the alternating current resistance (impedance) is lower and the capacitor is therefore more conductive. Thus, only
higher frequency signals reach the tweeter loudspeakers. Low frequency signals, which could damage the treble
loudspeakers, are suppressed.
Top-HiFi System (option 677) on E87
Top-HiFi System (option 677) on E90
6 channels (7 channels simulated - Logic7)
10 loudspeakers
•
2 treble loudspeakers, front 26 mm
2 mid-range loudspeakers, front 100 mm
•
•
2 bass loudspeakers, 217 mm
•
2 mid-range loudspeakers, rear, 100 mm
•
2 treble loudspeakers, rear 26 mm
Bandwidth: 30 Hz to 20.000 Hz
Max. acoustic pressure: 104 dB
Amplifier power:
Ω
2 x70 W (4
6x40 W 40 (2
) Bass
Ω
)
9 channels, 13 loudspeakers
•
1 mid-range loudspeaker, middle, 100 mm
•
2 treble loudspeakers, front 26 mm
Top-HiFi system (option 677) on E91
•
2 mid-range loudspeakers, front 100 mm
•
2 bass loudspeakers, 217 mm
•
2 mid-range loudspeakers, rear door, 100 mm
•
2 mid-range loudspeakers, rear shelf, 100 mm
•
2 treble loudspeakers, rear shelf, 26 mm
Bandwidth: 30 Hz to 20.000 Hz
Max. acoustic pressure: 110 dB
Amplifier power:
Ω
2 x 70 W (4
7 x 40 W (2
) Bass
)
Ω
SBT Audio systems: E87, E90, E91, E92 BMW AG - TIS 04.03.2008 14:22
Issue status (08/2007) Valid only until next DVD is issued Copyright Page - 2 -
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Top-HiFi system (option 677) on E92
9 channels, 13 loudspeakers
•
1 mid-range loudspeaker, middle, 100 mm
•
2 treble loudspeakers, front 26 mm
•
2 mid-range loudspeakers, front 100 mm
•
2 bass loudspeakers, 217 mm
•
2 mid-range loudspeakers, rear door, 100 mm
•
2 treble loudspeakers, rear door, 26 mm
•
2 mid-range loudspeakers (electro-dynamic planar
loudspeakers) at rear in headlining
Bandwidth: 30 Hz to 20.000 Hz
Max. acoustic pressure: 110 dB
Amplifier power:
2 x 70 W (4
7 x 40 W (2
Ω
) Bass
Ω
)
9 channels, 13 loudspeakers
•
1 mid-range loudspeaker, middle, 100 mm
•
2 treble loudspeakers, front 26 mm
•
2 mid-range loudspeakers, front 100 mm
•
2 bass loudspeakers, 217 mm
•
2 mid-range loudspeakers, rear door, 100 mm
•
2 treble loudspeakers, rear door, 26 mm
•
2 mid-range loudspeakers, rear shelf, 100 mm
Bandwidth: 30 Hz to 20.000 Hz
Max. acoustic pressure: 110 dB
Amplifier power:
2 x 70 W (4
7 x 40 W (2
Ω
) Bass
Ω
)
The digital TOP-HiFi amplifier is a bus participant in the MOST network. The Top-HiFi amplifier can only be used
with a MOST-compatible radio or navigation system. The audio signals are transmitted in digital form from the radio
or navigation system to the Top-HiFi amplifier via the fibre optic cable (MOST bus). The Top-HiFi amplifier converts
the digital signals into analogue signals and amplifies them before forwarding them to the loudspeakers.
The Top-HiFi amplifier is equipped with Logic7 (Surround Sound).
At least 7 audio channels are needed for Surround Sound. The BMW 1-Series has only 6 audio channels. Because
there is no medium-range loudspeaker in the instrument panel, the Top-HiFi amplifier simulates the Surround
Sound. This is done by distributing audio signals to the front door loudspeakers. Sound manipulation is carried out
before the signals are converted to analogue signals in the amplifier's digital sound processor (DSP).
The Top-HiFi amplifier has the same installation location as the HiFi amplifier.
SBT Audio systems: E87, E90, E91, E92 BMW AG - TIS 04.03.2008 14:22
Issue status (08/2007) Valid only until next DVD is issued Copyright Page - 3 -
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