Technical M&K Speaker/Tweeter Swapping Question?

[Systemlord]

Hello members,

I have enjoyed my M&K LCR-750THX 5.1 system (bought 2001) for many years now and want to upgrade my Z11MKTV 4 ohm tweeters with an M&K tweeter that will have higher quality mids and high frequencies without loosing the matched system as far as both tweeters having the same roll-off characteristics with the same sensitivity, I'm just looking for a more smoother, warmer and better detailed M&K tweeter. Z16 anyone?

Thanks for any recommendations, systemlord.