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

[ClaudeJ1]

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.!

[Dave MacKay]

5 hours ago, HPower said:

 

Hey Dave,

 

Do you have any pics of the front of your LSs showing Dave's lens in place?

 

Here's a photo:

 

I plan to veneer and refinish the speakers this spring.

[ClaudeJ1]

19 minutes ago, Dave MacKay said:

plan to veneer and refinish the speakers this spring.

Good Plan, since you already have the tweeters you can still listen to before then, right?

 

[HPower]

19 hours ago, Dave MacKay said:

Here's a photo:

 

I plan to veneer and refinish the speakers this spring.

 

Nice Dave.

We will all want to see pics once you get your LSs refinished!

 

 

 

[MookieStl]

I agree, the SMAHL v2 w De120 is a very noticeable upgrade. By a wide margin. Very happy I took the plunge.

[Mycuff]

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.