Have you swapped the drivers in the w bins? Also what do you mean by very quiet, if it's just barely any sound, it could be a connection problem. What happens when you attach the driver directly to the amplifier (amplifier, cable, driver), does it sound all right then?
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Cheers for the reply Cubo15! So we haven't swapped the drivers around yet, we are going to and check for the connections between the banana plug and driver terminals. Between all of the guys working hours we haven't got around to it yet! Likewise we will test the drivers in free air. I'll post an update as soon as we know more!