A 70hz wavelength is 5meters long, so having the sub on the same plane as the speakers shouldn't make this a problem? 80hz is supposed to be omni directional, I take it you sit closer then 5m?
Using a lower crossover and volume is typical to get a lesser sub to intergrate, my old sub was better crossed over below 60hz, my midbass is clean at 150hz in the same position.( same plane as speakers)
I need to cross my nearfield over at 40hz as there is still a lot of energy from higher up as the filter in the lfe out of my av amp seems shallow.
You might find you need to use a similarly low crossover when you move your sub to the back of the room.
I'm sure the pi 3s will be great up front!
If Your not aware you can gauge motor strength by the bl spec of your drivers.
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