Amplifiers and Speakers: Notes
The audio systems in the E90 offers two choices:
- HiFi system -10 speakers w/separate amplifier
- Top-HiFi system (Logic7) - 13 speakers w/Logic7 amplifier
In addition to the higher achievable sound pressure, the audio systems are also distinguished by the improved system fidelity. For the customer, the additional features such as the 7-band graphic equalizer and the spatial sound (Logic7) provide both visible as well as audible added value.
The central basses are located under the front seats. They are coupled to the side sills, thus enlarging the resonance volume necessary for bass reproduction.
The stereo, HiFi and Top-HiFi systems exhibit different performance features in terms of symmetry of the sound field, sound pressure and fidelity of the frequency response.
HIFI AND TOP-HIFI SYSTEMS PERFORMANCE REFERENCE
| HiFi | Top-HiFi | |
|---|---|---|
| Rad2 | Standard audio system | Optional |
| CCC | - | Standard audio system |
| Output | 180 Watts total: 2 x 40W (2ohm) Bass 4 x 25W (2ohm) |
420 Watts total: 2 x 70W (4ohm) Bass 7 x 40W (2ohm) |
| Max Sound Pressure | 104 dB as from 50 Hz | 110 dB as from 40 Hz |
| Bandwidth | 40 Hz to 20 kHz | 30 Hz to 20 kHz |
| Fidelity | +/- 3 dB | +/- 1.5 dB |
| Tweeter Manufacturer | 26mm (medium) Harman/Becker |
26mm (high) Harman/Becker |
| Mid-Rang Speaker Manufacturer | 100 mm (medium) Harman/Becker |
100 mm (high) Harman/Becker |
| Central Base Speaker Manufacturer | 217 mm (medium) Harman/Becker |
217 mm (medium) Harman/Becker |
NOTE:
Even though the diameters of the speakers in the HiFi and Top-HiFi systems are the same, there are differences in the output of the speakers. This is achieved by the use of different materials for the diaphragms, coils, magnets etc.
To distinguish between them, the designations Medium and High are used in the table above.
To distinguish between them, the designations Medium and High are used in the table above.