mboxler Posted January 30 Share Posted January 30 I built an AA for fun...sounded terrible. The sibilance on my K-33E/K-55M/K-77M Khorns drove me out of the room. I couldn't find a crossover error, so I set up my mic and ran some REW sweeps. Sweep One below shows a large dip between 300 and 400hz, and a large bump between 5 and 6khz. In Sweep Two below, I reversed polarity on the woofer. The blue trace shows that the dip is gone. Is this the K-55M phase shift issue the AK-3 corrected??? Sweep Three below explains the bump between 5 and 6khz. The K-55M is fairly flat to 6khz, then drops. The AA tweeter on the K-77M crosses the K-55M around 4.5khz. I have an AK type tweeter filter, so I put an 8 ohm resistor across the AA tweeter out, and connected the AK tweeter filter between the amp input and the K77-M. As you can see, the AK filtered K77-M crosses with the K55-M perfectly at 6khz. Sweep Four shows the AA (red) vs the "AAK" (blue). Not bad! Does the K-55V drop off sooner than the K-55M? If so, was the AA tweeter filter designed to compensate for that drop off? Oh...my Type "AAK" sounds pretty good! Still some sibilance but nothing like it was with the AA tweeter filter. Thanks, Mike 1 1 Quote Link to comment Share on other sites More sharing options...
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