Help needed with Martin Audio W8/W8S

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   Hello everyone
I've just come across your forums and decided to make a post here before reading through a couple of must-read posts because I'm not sure if we're having a specific problem or a general one.

Many years ago our band got a deal where we bought 2x Martin Audio W8 and 2x Martin Audio W8S after someone demonstrating them in a venue. We've been on and off playing, and now as we're starting up again, our expert has moved far away and basically I'm left in charge figuring out how to get everything up and running.

I'm eager to learn, but this is very overwhelming and the first thing I've noticed is that the sound it's producing once we connected everything is not loud at all, so somewhere something is wrong and I do believe it might be a user setting than it being damaged. Currently our monitors (4x Martin Audio LE-350A with an LAB.GRUPPEN LAB2000c amp) is louder and better sounding than the W8 and W8s.

Here's a full list of our PA system:

Speakers:
2x Martin Audio W8 
2x Martin Audio W8S

Amplifiers for the speakers:
2x Crown CTs 3000 (These seems to be connected running the HF and high-mid in the W8)
1x LAB.GRUPPEN LAB4000 (This one seems to be running the low-mid in the W8)
1x LAB.GRUPPEN FP7000 (This one seems to be running the W8S)

System controllers:
2x Tannoy TDX1 Digital System Controller

Monitors:
4x Martin Audio LE-350A

Amp for monitors:
1x LAB.GRUPPEN LAB2000c

Mixer:
Soundcraft Si Expression 3

Question about the speakers:
There is a switch on the rear panels which says active/passive, is this for a crossover filter inside the cabinets that is in use if the switch is set to passive?

Also there are a total of 4 inputs on the panel for the speakers, where the cables we have can only be put into two of the inputs, and only one of the input gives sound. Why does one produce sound, but not the other?

My temporary conclusion:
Since the monitors produces more sound than the W8 and W8S, the problem might be the digital system controllers not being set up correctly?

Where do I start?