These specs are typical of a Class A/B amp. 100x2@4 0hms (total of 8 ohms seen by amp), 200x2@20hms (total of 4 ohms seen by amp), 400x1@4ohms (total of 4 ohms seen by amp)

I'm betting your subs are SVC 4ohms (single voice coil 4 ohms each sub) and in that case you can only wire them in stereo for 100W to each sub or in series for a final load of 8 ohms which when connected to your amp bridged will still cause it to produce 100W to each sub (200W total, same as wiring in stereo.

So either way with those subs you can only make that amp put out half it's max power.