I have a 2 - LSR6328P monitors. The 8" lf in one of them is sounding low in volume and distorted. I've swapped out the speaker, the amp and input card with all good components from the other monitor and it still sound the same. And even put what I thought were bad components in the other monitor and they worked fine. What else in between the amp and the speaker? The transformer? Its the only thing I haven't swapped out yet? Has anyone experienced this before?