Hi matthewpiano :wave:
Sorry haven't heard the speaker box 5 but I do use the following project items in my system:
Speed box S with my Debut 3, great upgrade, saves having to move the belt when changing from 33 to 45.
Amp Box DS stereo amp for use as front height channel with my Onyko 818 av amp.
Impressed with the sound of that amp so have recently added two Amp Box DS mono power amps to drive my Monitor Audio BX6's at the front,when I have the funds will get round to upgrading the other channels.
Overall very impressed with the range.
Hope this helps
:bounce: