Hello, I have been upgrading my Audi A5 with a better sound system for quite some time now. It’s already advanced: Audiotechnik Fischer 82DSP => 8 channels (not flashable) with 55 watt RMS power Door bodies and door panels are insulated with aluminium butyl and insulation paste Currently the original Audi B&O speakers After the whole insulation action I found that the B&O bass driver is buzzing in itself with stronger basses… no longer the door panels themselves. Now I stand in front of the Entschei I could imagine a 20cm system 1) The Focal IS200 system for approx.140 EURIS200 2) The Hertz SV200 with the Hertz DT24 for approx.200 EUR. (with an Eton crossover)SV200DT24 3) Other suggestions => Price definition the 150 EUR class. Is the extra charge on the Hertz system? M.E. the Hertz has a higher RMS load capacity (200 watts instead of 100 watts) and a higher efficiency. The RMS Bel the efficiency is not so relevant for the “weak” power amplifier. The Focal IS200 has very good resonances in the forum… I haven’t heard anything about the Hertz yet. What do you think?