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If you are using a low pass at 50hz with an 8" woofer, the range your sub is actually playing is going to be extremely small. I'd wager it's rolling off somewhere in the mid 30's, and then it's going to already be down by 50hz as well, so unless you are listening to something centered around 40hz, you won't get much.
As for the cone movement, you need to make sure your plate amp has a high pass filter to protect the small driver from overexcursion below 30hz. If your plate amp has one built in, it's probably centered around 20hz, a bit too low.
Ultimately, the manufacturer had taken the limits of the sub into account and built the proper filters into their plate amp. You went with a different plate amp and now you'll have to essentially guess where to center your filters at. If it were me, I'd set the low pass to 150hz and the high pass to 30hz.
As for the cone movement, you need to make sure your plate amp has a high pass filter to protect the small driver from overexcursion below 30hz. If your plate amp has one built in, it's probably centered around 20hz, a bit too low.
Ultimately, the manufacturer had taken the limits of the sub into account and built the proper filters into their plate amp. You went with a different plate amp and now you'll have to essentially guess where to center your filters at. If it were me, I'd set the low pass to 150hz and the high pass to 30hz.
