Bought a pair of custom made Belles the CTS 15 inch 4 ohm with the PD 4 mid and the electric voice 35 tweeter .The cabinet is perfect .Originally I have seen and listened to other belles and these look and sound great .talked to Bob crites he didn't recognize the crossover ,said if I buy any one of his would do .I'm very happy with the sound does anyone use that horn usually 80 or 81 models I heard may have tried it before I go and buy the K 55. I am new to this website and have really never been a huge Fan until I heard these .they have no serial # and I don't recognize the crossover but the build quality looks identical to the real deal ,matching Veneer with the same pattern so Who ever built it did a better job than any I have seen Does any one know if any klipsch speakers came with no serial number? I am keeping them so any info on an upgrade based on the speakers I have would be appreciated thank you