ackpht

For now just the K-horns powered by an old Sansui receiver. Source is audio CDs.

OK, the La Scalas date from 1978 (I bought them new) and have round-driver tweeters and AA crossovers. Their midrange has always been "bright" but not shrill. Serial numbers seem to have faded away- I think they were LS17655 and LS17656. A couple of years ago I bought a second pair of La Scalas (price was right) but haven't listened to them much. They have AL crossovers, K-55-M midranges, and square-driver tweeters. The K-horns have no paper labels but there are numbers stamped in the plywood at the top rear of the lower section. They are 16U841 and 16U842. If these aren't the serial numbers, please tell me where to look! They have AA crossovers, the K-55-V midranges as mentioned before, and square-driver tweeters. The K-horns do not sound damaged- there is no "raspy" sound that I associate with damaged drivers- but the midrange does sound shrill- as though some frequencies are being distorted or over-amplified (as though driving a resonance in the hardware somewhere?) My house isn't big so most of my listening is from only 6-8 feet away. At the moment they are flat against a wall (no corner room available) and I built plywood extensions to simulate corners. Any suggestions appreciated.

First post, have had La Scalas since college, recently got some used K-horns. The "compression" in the K-horn's midrange is quite noticeable. I've read up on Al Klappenberger's upgrades and wonder what I should do first- new horn, new crossover, or should I start by checking out the drivers? Could a sick driver make this "screechy" behavior worse? Drivers are K-55-V. Thanks.