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I recently picked up a pair of Electro-Voice DH1506 compression drivers (CD) to upgrade my CF-4's. There was nothing wrong with the stock K-63's, but strong endorsements from Moray James and Alexg5775 got me wondering if the already fantastic sounding CF-4's didn't have a little room for improvement. I A/B'd the K-63 and the DH1506 and found them very close in sound. My testing was very informal and the sound was slightly better in the midrange with the DH1506. I wanted to get them measured properly to see if the diaphragms were within spec, so after a quick call to Mustang Guy I was off to the Speaker Ranch to get them measured. As usual, Craig had a better idea. I call his place the Speaker Ranch because his building is so large it's like a free range area where Klipsch speakers can wander and play freely, as loud as they want. There are fully 6 La Scalas set up in a 6.2 configuration, sometimes more. See Mustang Guy's signature for the entire list. It was around 20 or 30 last time I checked. Craig immediately grasped a 1506 which was attached to the CF-4 horn and connected it to the squacker section of the right side La Scala. Then we listened. We set up in the main LP and could hear an immediate difference, probably in favor of the DH1506. I say probably because this was NOT a controlled test, it was very much seat of the pants. We both thought the DH1506 might have been more efficient making that side a little brighter. If there was a difference, it was very little, both CD's sounded fantastic. Certainly one CD could be used interchangeably with the other and in a blind listening test you could not tell which was which. Craig took some measurements of both CD's in a very interesting way, so I think I'll stop here and let him post his comments.
Klipsch K-63-KN Compression Drivers, pair. Fits Klipsch CF3 or CF4. $200 shipped. Condition: Used, in perfect working order. +++ These are Neodymium drivers so even though they may look relatively small they are as powerful as larger heavier looking drivers. They were very expensive when available and are very hard to find. The last price I found while doing research was $768. Moray said he thinks Klipsch might still have some in stock at around $900 pr. These were removed from a pair of CF-4's version 1 which were upgraded with different drivers. They are up for sale now so you can buy the exact match Klipsch compression drivers to the CF-3/4 horns Moray has for sale . CF-4 Compression driver (horn not included) K-63-KN on right, (the horn, which has clear silicon seal to damp it, is not included)