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New tweeter results for 1986 La Scala (SMAHLv2/DE-120 versus K-77M)

Dave MacKay

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On 1/2/2022 at 2:48 PM, Dave MacKay said:

used REW to take some measurements before and after changing the tweeters. Because I was focused on the tweeters, I measured a range from 4500Hz to 20kHz. The room conditions, equipment, and all parameters were kept the same. I took three measurements before and after changing the tweeters. I "burned in" the new tweeters for about 8 hours before measuring them. This chart shows the average of the measurements, with 1/12 smoothing:

Your scale in the Y direction is too shallow to Clearly show that the K-77 is down by 25 db at 20 Khz.!

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  • 2 years later...

I too recently upgraded my K77s to Dave's SMAHL V2 tweeters.  They were a snug fit and the bolt holes lined up perfectly.  Sound is fantastic, a great improvement over the originals.  Here is a closeup installed in my 1986 La Scalas.  I would probably paint them but they are normally behind a grill.   Well worth the nominal expense for the quality of this virtually indestructible tweeter.


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