Sound quality is my main goal that's why I want to try bi-amp. Separating the high/mids and low.
Not sure about the slope but the frequencies are 100, 200, 400, 700, 1200, 2000 and 3500 CPS.
I bought all the Heathkit gear from a reputable tech. It's part of his collection. So everything has been restored and upgraded. Heathkit is his favorite gear!