I just found a great deal on four Ciare 12.64 NdW1 drivers. They want a 100 liter box for four drivers tuned to 52 Hz. The problem is to fit four 12" drivers into such a small box. How shallow can the depth of a box be made without it affecting the sound? Any thumb rules for this? If I only know how Schroeder design his compact cabs I´d go with something like that. Check the specs and tell me if I should back off and not buy them, please! http://www.visaton-bausaetze.de/pa/index.htm?/pa/ciare_3.htm Scroll down to the right driver!