Position of Tweeter in A7

Hi,

I have JBL 2405 and has been using it on top of the 511 for convenience. But lately, when I lowered it to on top of the cabs, the sound seems to improved, particularly the highs, snare drum brushes, cymbals had more definition. Currently I had them placed on the inner side of the 511s, at the rear so that I could align the voice coil of the 2405 and 802 to prevent phase problems.

Just wondering if there's any advice on the optimal position of a tweeter in the A7 and what are phase adjustments required.

Thanks
David