Mounting the Alphas in H-frames is a newer design than using them in the same flat baffle shared with a smaller driver. I think I'm the second person to do the Tang Bands over the H-frames and was flattered when speaker genius MJK asked me to post pictures in his quarter-wave gallery with a build narrative.

The Tang Band W8-1808 really doesn't need a tweeter but I just like that little bit of metallic sparkle especially with brushed cymbals. The 4.5 Fostex driver can go it alone in the upper frequencies and while they have wonderfully detailed point source imagery they can come off a little thin compared to the 8 inch Tang Bands ( and probably the 8 inch Daytons as well ). The TB's are the smoothest and easiest to listen to drivers I've heard. Their price, unfortunately has risen through the roof.

Providing separate amplification and avoiding passive XO's for all my drivers and being able to control them has not been easy. I take the optical out from my CDP and pass it to a volume controlled DAC then take the analog from the DAC and feed it to the Dayton/Emo mono-blocks which are daisy chained together and power the H-frames. The preamp gets the analog signal from the same CDP and feeds the Paramour mono-blocks which power each separate channel for the Tang Bands and tweets.
I have ordered two low pass XO's to try with my next set of H-frames so I can get some use of my old ss gear collecting dust in my attic. I don't think solid state bass suffers as much from the evils of a passive XO.

I would like to incorporate my TT in the mix but yet have not been able to come up with a solution. While my pre has two outputs it's down on gain when both are used. The CJ pre ( had to give it back ) had plenty of gain for both outputs but it allowed for limited control of the H-frames.