I just installed my shiva driver into a 142.5 L tube tuned to 18.1 with the adire 4" flared port but the thing is making a terrible noise at about 102 db. My room is 25' x 16' x 8' It is not the klanking sound people have described when a driver bottoms out but more of a very distorted sound when it plays low at about 102 db . The scene I used to test the new speaker was from ID-4 in the opening where the ships are passing the moon and the plack comes on screen. Very low rumble. The performance is not any better than the old speaker I had in the tube The amp is from a sound dynamics sub and is rated at 150 watts at 8 ohms 300 watts max. I wired the shiva voice coils in parallel I think? I wired the positive to positive and negative to negative on the speaker and then ran the amp wires to one of the coils. Is this correct? I think it is the amp clipping but I don't know for sure with the shiva driver. What do you think?