Also benefit from a 6db xo on my A7s. The original Altec xo's were missing when I bought the used A7s; the 12db after-market replacements were dreadful. At any rate, following countless hours of trail and error settled on the 6db xo, at approximately 600hz as the most musical, transparent, and dynamic XO I could cobble together without any sort of test gear, other than my ears. Power handling is not an issue as I rarely listen above loud conversation level.
No doubt, there are issues with the xo that need to be rectify, but without proper test gear and a lack of technical skills, it?s just not going to happen.
I?ll post a drawing of the xo later, welcome all comments, useful or otherwise.
Cheers