Servus, currently have the following setup in my A3 8l power amplifier : Audio system R105.4 Sub: Audio system R12 Evo in the BR front system: Audio system R130 The sub has a double swinger coil with 2x300w at 4 ohm. The whole runs if I remember right on 2 ohm with me. Now I wanted to ask it more worth to get to the 4 channel to get a monoblock (Audio system M850.1 e.g.) Or rather a more potent 4 channel (Audio system X170.4) Or is it enough already a gladen RC 1200 C1 ? n the R12 already presses well but some performance he could already contract, and further sub upgrades are planned Would I be happy about an answer Mfg