I added the BSC circuit after reccomandation and great help from M.K. It cured the tiring boost in the mid range. My amp(poor Chineese tube)did not handle this to good. I think i lost too much of dynamics and without an ss or bigger amp i desoldered the circuit and broke the drivers in for about 400 hours almost constantly playing. After that the midrange fell to place with the rest of the picture and i even removed all of the damping and stuffing in the compressionchamber(horns). Now my humble setup provides very realistic and dynamic performance. I still have some problems especially when playing loud. This may force me to try the filter again and some damping in the chamber. I then have the chance to try the filter with an vintage mcintosh amp that i have purchased and remove some of the tweaks to start at scratch again.