I’ve been looking for the box installation dimensions in my TTR for a long time – so far unfortunately unsuccessful :- ( currently own a Helix 500Q MKII power amplifier and would like to feed it with the suitable boxes. Prerequisite: only original installation spaces should be used (except final stage of course ;-)). The question now arises which boxes fit into the doors, into the rear installation places and which sub can I screw between the seats? For the front places I don’t want me hr than 200,-€, for rear max. 100,-€ and for the sub around 150,-€. I currently prefer Canton QS2.16 (or Rainbow or Focal?) for front. Back: a coax from the same company as before 🙂 Sub: I don’t know! Hope of you can help me! Thank you very much!