It's going pretty much as it should.
I think those amps are 100 w/ch each, yes?
Even if both amps were fully additive in the bi-amped configuration and equal to 200 w/ch, it would be only a 3dB increase in volume. 3dB is generally the point at which people just start to notice a difference in the loudness. This is the best case scenario.
If much louder is what you want, you'll have to come up with much more powerful amps. It will take roughly 10 times the power you have now to make the system sound twice as loud.
I think those amps are 100 w/ch each, yes?
Even if both amps were fully additive in the bi-amped configuration and equal to 200 w/ch, it would be only a 3dB increase in volume. 3dB is generally the point at which people just start to notice a difference in the loudness. This is the best case scenario.
If much louder is what you want, you'll have to come up with much more powerful amps. It will take roughly 10 times the power you have now to make the system sound twice as loud.