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Multi-Way Conventional loudspeakers with crossovers

ATC SCM12 repair (tweeter exchange and more....)
ATC SCM12 repair (tweeter exchange and more....)
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Old 13th November 2019, 10:35 AM   #1
Pida is offline Pida  Czech Republic
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Join Date: Mar 2006
Location: Brno
Default ATC SCM12 repair (tweeter exchange and more....)

I got a pair of SCM12 for repair, major issue was that stereo imaging was moved to a side. I took measurements of the original state. It was clear that one of the tweeters was reversed, but even after correction of polarity the FRs of both loudspeakers were not matching. It was quite clear that something was wrong with tweeters or crossover components.
One of the graphs show impedance of new tweeters D26NC-56-06 (blue and purple), original were D26NC-55-06 (other 4 curves). It was not sure if 56 is really drop in replacement.
Measurements after repair showed that 56 is good drop in replacement. Resulting horizontal responses are good, though there is impact of raised edges, as expected.
Overall, this was successful repair.

ATCSCM12 :: Pkaudio
Attached Images
File Type: png D26NC%20impedances.png (65.0 KB, 46 views)
File Type: png imp%20black%20red.png (60.4 KB, 46 views)
File Type: png SCM12%20new%20Black%20Red%20H%200.png (41.9 KB, 46 views)
File Type: png SCM12%20new%20Red%20H%200-90.png (167.6 KB, 47 views)
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Old 13th November 2019, 10:38 AM   #2
Pida is offline Pida  Czech Republic
diyAudio Member
 
Join Date: Mar 2006
Location: Brno
Here are measurements of original state. One speaker had tweeter with reversed polarity. FR with correct polarity is shown too.
Attached Images
File Type: png SCM12%20obe%20bedny.png (55.1 KB, 45 views)
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