Hi,
Iam one of the struggled guy who cant able to tune the dual sub but my scenario is different one ,due to mismatch in sub power one is taga tsw120 and other one is svs pb1000pro finally after one month of try gave up realizing it wont work for my environment as i dont have space to change the position of sub as its a living room setup and fellow members adviced me personally that it is not possible due to power mismatch as it makes over all bass response muddy,sold taga sub to my frnd. Taga is gud sub and if u have budget and go for dual ones or else get a big sub like polk hts 12 and update the same sub dual after a year .make sure them to fine tune the sub in your environment after setup