The monster cases are available even with 6u and 9u. the reason for these additional cases is that the 12u monster cases are a bit difficult to handle by one person only. at least for the double version a-100pmd12 two persons are necessary.
On top of this it is necessary to have available smaller versions of the monster cases when they are mounted together (because of stability and appearance - with a 6u case as upper element the construction looks not that "intimidating").
The 6u monster case a-100pms6 are equipped with two power supplies (a-100psu2) and four bus boards, the 9u version a-100pms9 with two power supplies (a-100psu2) and six bus boards
Single version of the 9u/168hp a-100 monster case with 9u/168hp (a-100pms9):
outside dimensions (with front cover, closed state): ~ 90 (length) x 48 (height) x 23 (depth) cm
weight of the case (incl. bus boards, power supplies, with front cover, without modules): ~ 14 kg
outside dimensions of the single case (without front cover): ~ 90 (length) x 48 (height) x 18 (depth) cm
9 u x 168 hp
max. module current: 2.4a (two power supplies 1.2a each, one power supply is assigned to three bus boards)
Inside usable depth for a-100 modules: approx. 70 mm in the power supply area (bottom right), resp. approx. 100 mm in the remaining area (measured from inner side of the front panel until end of the pc board of the module).
position of the mains inlet: center of the rear panel