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New Tweeters: In or Out of Phase?

I fried a tweeter in a KEF 104.2 speaker and replaced it with a VIFA unit that has .5db higher sensitivity than the stock unit. The VIFA replacement does not indicate + - leads. Does anyone know how do I tell them apart and what are the sonic effects of incorrect wiring? The new tweeters are a great improvement over the orignal 1990 tweeters but are a little bright. I hope this reduces after burn in or is it that they're out of phase? Should I have gone with Morels whose sensitivty is rated at 2.5db less than the Vifa, but might have better matched the 2 midrange elements (from 1990) that might have lost sensitivity since their manufacture in 1990.
Thanks for any responses.
somec59

Showing 1 response by jtgofish

jtgofish
490 posts
 
My suspicion is that the Vifa tweeter has lower impedence than the KEF T27.Even if they are rated at the same nominal impedence their actual impedence could be quite different.

Impedence affects crossover points so there are other factors to consider other than just sensitivity.

The KEF T27s do sound a bit dull.I have been told this is due to fatigue-so a new tweeter probably should sound a bit brighter.
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