The models most like the Klipschorns are the cornerhorns, and a valid comparison would be the Theater Series seven Pi's, which use components of similar quality.If you want a real treat, build yourself a pair of Professional Series seven Pi's. They have JBL pro drivers with advanced motor structures and shorting rings that reduce distortion to very low levels, some 50x lower than drivers without shorting rings.
The Klipschorn is an excellent design, but it just can't match the performance of Professional Series seven Pi's with JBL pro drivers.