It doesn't matter if the sensivity of the two are different. The effect is the same a wall of sound. I did this to get as much sound as I could. Then I started to like soundstage and imaging. Now I use 1 pair at a time and my tube amps wouldn't exactly like the drop in resistance.
Although I still have some SS amps and Klipsch LaScalas which I have once or twice connected in parallel to vintage JBL C36 and C38s (Yes both using D-130s, 131s with 075 tweeters)They are exquisitely sensative and seem to compete well with the Klipsch. I do it just for sheer volume try playing BBBAD Bad To The Bone like that when you feel raucous.I am rally getting too old for that I must admit.
Although I still have some SS amps and Klipsch LaScalas which I have once or twice connected in parallel to vintage JBL C36 and C38s (Yes both using D-130s, 131s with 075 tweeters)They are exquisitely sensative and seem to compete well with the Klipsch. I do it just for sheer volume try playing BBBAD Bad To The Bone like that when you feel raucous.I am rally getting too old for that I must admit.