Welcome to the Speakerbuilder.net discussion forum. While being polite and respectful is not common on the internet, please try not to flame people who don't deserve it. Otherwise, go nuts.
I would like to build a pair of Lyra 3 ways, as I also like the sound of 70s and 80s 3 ways. I would like to put them in my living room and - smaller is better for the WAF. Therefore, I would like to downsize the woofers. I see that the Dayton 8" and 6.5" woofers have almost the exact same T/S parameters and sensitivity (particularly the 6.5"). Would there be any significant problems with this substitution?