I have to wire:

3x (Medium Range speaker 6 Ohm + tweeter 8 Ohm with capacitor 4.6uF parallel.

Amplifier has writing 4-16 Ohm. Maximum turned on 1/4 of maximum, not much bass

The speaker should be all the same loud or if possible 1 a little bit reduced.

How can I wire that? All parallel, all serial (what happens with the capacitors as they would be also partially serial?)?

Please help!

Three x 6 ohm (nominal impedance) speakers in parrallel will give a combined nominal impedance of 2 ohms.

Better off making a system with 2 woofers wired in parrallel and a tweeter. The capacitor should be in series with the tweeter. A 4.7uF capacitor represents a crossover point of around 4.2kHz.

Real system impedance should nominally be 3 Ohms using this arrangement which should not be a problem for the amplifier.