I just put my Altec model 14's into service, and they sound wonderful! I am powering them with Kavent Class A monoblock amps straight from China with grand results. While my high frequencies are shimmering and clear, and the mid bass is spectacular, they appear slighly muddy in the midrange. I am wondering if it would help to have the crossover's rebuilt, or the internal wiring of the speakers upgraded. Does anyone have a suggestion for me?