I have been talking with Nick, and the drivers I got are the Mark Audio A10P 6 1/2 inch drivers, with the “enable” modification by Dave at planet10-HiFi.com.
Bottom line, I highly recommend this driver. I get loads of detail, a very warm sound and plenty of bass. However…
First of all, according to Dave, this is probably the maximum size that he would use for details and definition, and sufficient bass. I got my pair and I have been playing them for about a month, and I just today put them into new larger cabinets of my own design and they sound better than I have ever heard before. So they are really great drivers.
However, just dropping them into a premade speaker cabinet with premade 5 1/2 inch cut outs will not work with these drivers. If you look at the Mark Audio diagram and specs for the speakers, it looks like it should be a perfect 5 1/2 inch cut out hole. However, this is wrong. I tried this size cutout in another cabinet and it totally does not work; It is too big. They require a 5 1/4 inch cut out which will allow them to seat in snuggly. And you want them snug. The screw in holes are right next to the edge of the cut out, which I don’t appreciate but it is what it is, so the cut out hole cannot be even a tiny bit too big, or one or two of the screws will try to screw in to air. So unfortunately it is not necessarily true that a standard cut out will always work. You have to always look at the speaker itself and try it.
Of course, if a hole is a bit too small you can always make a little bigger. But if the hole is too big you cannot make it smaller. Kind of like cooking and putting in too much salt.
Another thing about these drivers, while they sound better than any driver I have used yet, the frames are actually scientifically designed and made of plastic! So you can’t just screw in screws with some kind of power driver. And you need a metric hex key of the correct size. The screws are included with the speakers. FYI. Some of the oddest speakers I have come across, but they seem to work really well. Caveat emptor.
Gary