Wow. You are not kidding on a challenging environment. The photos are worth a thousand words.
i would try small monitors on stands on the granite shelf. Put them just high enough not to get heated by direct radiation from the fireplace. This would allow cutting down the distance apart. Looks like you already have a subwoofer there… that would continue to work.
i would try small monitors on stands on the granite shelf. Put them just high enough not to get heated by direct radiation from the fireplace. This would allow cutting down the distance apart. Looks like you already have a subwoofer there… that would continue to work.