Although Scan Speak drivers are very good in general, I'd avoid using a 2-way design combining an 8" woofer with a 1" tweeter. If you pay a high enough price you can find a 1" dome tweeter that operates at low frequencies (in the 1 to 2 kHz range) without high distortion. But you will not find an 8" woofer that can operate as high as those frequencies without beaming.
By beaming, I mean it may produce good sound directly in front of the driver, on axis, but off-axis (off to the side) at angles of roughly 30° or more, it's sound will drop off significantly. At the crossover frequency, where the woofer & tweeter are both equally loud, the tweeter will spread sound widely while the woofer will confine it to a narrow range. A speaker that disperses sound widely across most of the audio range, especially the mid range, creates the illusion of sound coming from outside the speaker cabinet. In stereo this contributes to a realistic sounding image with a wide and detailed sound stage. If the woofer and tweeter distribute sound unevenly, this image tends to get lost.
People often respond to this by saying 'I only listen while sitting directly in front of my speakers and not off to the side'. They're missing the point. A large part of a speaker's wide stereo image is caused by their off-axis sound reflecting from walls. Speakers that beam sound cannot do this as well as speakers that disperse it widely. So, even if you only sit directly in front of your speakers, or in the middle between them, you could miss out on a significant part of the illusion of a wide stereo image if you use 8" woofers in a 2-way design.
You mentioned the 2-way speakers you now have. Are you going from the Fountek 6.5" woofers to an 8" woofer mainly to get better bass response? Or do you have a different reason?
