The "normal" passive kit has the port sitting in the back on a removable plate together with the input terminals. The Ground Sound Coolback II 600 has replaced the removable plate. The reflex port has been mounted in the bottom and four 25-30mm high feet will make sure that the port will work correct

The initial test of the loudspeakers is performed with an old NAD pre-amp and low price Sony CD player - But the sound was quite OKAY and much better than from any other loudspeaker that he have owned previously. Most astonishing is the bass control and the effect of tweaking with the room modes - in his room 42Hz and 59Hz.