Hi together, I recently installed the Rainbox SLX 265 Deluxe as a front system in my 3 golf. In order to make more use of the speakers, I would like to buy a power amplifier. I am currently thinking of a 4-channel power amplifier, so that I can add a small subwoofer later on. As HU I have a Becker Cascade, where I can set the crossover frequencies for front/rear and sub purposefully. It doesn’t have an LZK. Oh yes, I usually hear Ro ck and Pop. In the beginning I looked at the Helix Dark Blue 4 and the u Dimension JR 4.300 more closely. I’m afraid, however, that the performance will not be enough if I use 2 channels for a small sub, or what do you think? Do you have a final stage proposal for me, which harmonizes with the Rainbow SLX 265 Deluxe and additionally leaves the possibility of a sub-upgrading open? I’m ready to spend 300-400 euros for it. Which sub-harmonies with the above-mentioned system? I Does it also make sense to use the crossover function from my radio, or should it be better set at the power amplifier? Are there also power amplifiers with LZK in the above price category? Thank you for your help!! Julian