If your 2.8mk2 or 5.6mk2 will be converted from front firing to down firing port using same dimension, the result of SQ will be likye this.
Dnt forget how this sounds... The AN will have better SQ than this.
Here's the video of Tannoy Revolution XT 6F
If you like the SQ and bass... X 3 niyan ang SQ ng hi mid at bass ng AN pg nka down firing.
Video:
http://youtu.be/FuhjuAWxzekAlso this:
Canton Down firing port. As you can hear and compare the low freq even via you tube, you can hear the character of down firing port.
Video Canton:
http://youtu.be/ElgHNnr5Qd0As per observation, since i've a down firing port 2.8mk2 cab, the bass is tighter and controlled compared to front firing port and TL cab. Kahit deeper ang bass it never over power the hi and mid freq. Naturally clean deep bass. This is just my own experience and observation.
Still, your choice.