On my vintage system I use JBL 166's and JBL 4312A's in tandem. What the 4312A lack (Highs) the 166's have in spades and likewise the Midrange of the 4312 make up for what the 166 is short on. Its a match made in heaven for 70's Classic Rock. Havent found 1 speaker that has it all.
Does anyone play two pairs of speakers at the same time?
I have found that certain combinations of speaker pairs produce a better sound than the single pair alone. For example: Klipsch Quartets and PSB Image 4T (new tweeters from Vifa) Quartets inside pair and volume matched to PSBs. I have done this over the years and found some great combinations.