The device has an integrated 4 x 50 watt MOSFET amplifier designed for connecting four speakers. It offers 3 pairs of RCA preamplifier outputs (4 volts) with adjustable subwoofer crossover and high-pass filter, which enables the connection of additional amplifiers or active components.

For the direct connection of two tweeters and four door speakers (six speakers in total), the car radio itself is only designed for four speakers with power amplifier output. In order to operate all six speakers optimally, it would be necessary to use an external amplifier connected via the cinch preamplifier outputs. This means that two tweeters and four door loudspeakers can be powered via an external amplifier.

To summarise: You can connect four speakers directly to the device. For two tweeters and four door speakers, you need an additional amplifier that is connected to the preamplifier outputs.