The older horns were of a metallic material, which constituted ringing. Back then, we used Mortite to dampen this ringing. The newer elasto polymer ( whatever ) materials, have resonance issues, and ime, creates a dirty environment for the driver. This is more obvious to the ear as the volume...
They are not a matched pair, as the woofers look different. A nice set of matched, original Heresy can bring to the seller, between $400 and $800 pr. My best, MrD.
You need to allow plenty of break in time with the LS. IMO, they are in another league over the CW. I have been a LS fan since their 1960s introduction, and with a few tweaks, they can be amazing. The mid horns would easily benefit from an ample layer of Dynamat. The crossover would also benefit...