Audio System: Components

The head unit for the audio system is available in four versions

LOW

- with radio and cassette player: HU-101.

MID

- with radio, cassette player and CD changer control: HU-401, HU-411.

HIGH

- with radio, cassette player, CD player: HU-601, HU-611, HU-631.

PREMIUM

- with radio, integrated 4 disc CD changer and Dolby Pro Logic: HU-801.

- with radio, CD-player, MD-player and Dolby Pro Logic: HU-831.

Common functions

Electronic volume control.

Automatic loudness and mono/stereo connection.

Telephone mute (not HU-101).

ASC - automatic volume setting depending on vehicle speed (not HU-101).

Factory setting on internal equalizer (not HU-101).

Manual preset of 20 FM stations.

Manual preset of 10 AM stations (not HU 101).

Autostore - automatic preset of 10 FM stations (not HU-101).

Autostore - automatic preset of 10 AM stations (not HU-101).

AF - automatic search for alternative frequencies.

Factory setting of frequency steps and frequency bands when searching stations (global parameters from Central Electronic Module (CEM)).

Full logic cassette player with auto-reverse, fast forward/rewind, Pinch-off, Dolby B, automatic tape type setting and music search (not HU-801/831).

Keypad in the steering wheel

All head units (not HU-101) have the steering wheel key pad as an option. The keypads are available in two versions; only audio keys or audio and telephone keys (telephone must be combined with the audio system).

Loudspeakers

The audio systems with separate amplifiers are equipped with loudspeaker elements with higher power tolerances. The treble loudspeakers contain high passive crossover filters (even the treble in coaxial loudspeakers).

3x4" coaxial loudspeaker in the dashboard if RTI is installed and 6" if RTI is not installed.
treble and 6.5" bass speakers in the front doors (integrated splitting filter).
coaxial loudspeakers in the rear doors (integrated crossover filters).
coaxial loudspeakers in the parcel shelf (integrated crossover filters).

Wiring

The loudspeaker wiring (not center loudspeaker) and wiring for the antenna amplifier for the main antenna are pre-routed.

Cars with audio system HU-4XX and upwards are equipped with wiring for the center loudspeaker, sub-antenna and positive supply to the separate amplifier.

All loudspeaker wiring is twinned to avoid interference.

Antennae

The P23 has two radio antennae, one main antenna (windshield antenna in the rear windshield) and a sub-antenna (not HU-101). The sub-antenna is mounted in the rear bumper on the right-hand side and has an antenna amplifier mounted in the cargo compartment under the right tail lamp.

On cars with RTI the sub-antenna is also used for traffic information for RTI.
On cars with HU-101 head unit the sub antenna is not installed. (HU-101 cannot be combined with RTI.)

On cars without RTI and with a HU-4XX head unit both antennae are connected to the radio.

NOTE:

When installing the RTI as an after market component the sub-antenna amplifier must be replaced.

HU-4XX and upwards have Diversity function (twin antenna system).
The diversity function reduces the risk of multi wave interference (Multipath). Because of reflection the radio antenna can receive the same signal at different times, the signal that has traveled furthest arrives late. If the signals are in direct opposition at the point where the antenna is located they blank out each other and the radio does not receive any signal. Because the car has two antennae (main antenna and sub antenna) the radio uses the antenna which is least affected by multipath.

External amplifier

The external amplifier is located under the right front seat.

The amplifier is an option for HU-601/611/631 and is standard for HU-801/831.

The amplifier has a power handling capacity of 4x50W.

CD player for 10 CDs

The CD changer is available as an option and is installed on the bracket in the cargo compartment (HU-4XX and upwards).