These Markaudio - 12P driver based speakers relies on the one 8" driver handling from very low to very high frequencies. They may not have the super deep bass of a couple of 12" bass drivers or the airy highs of titanium tweeters but they do cover an extreme range and cover it well. What they do better than most multi-driver speaker is image perfectly. They produce a believable well scaled image and with the right amp will produce 40hZ. At 92db of efficiency they work well with low power amps.
The boxes are about 90ltrs and are built to the design provided by Markaudio. The port is provided by a short front baffle board. Its dead quiet until 40hZ then comes into play. The boxes are braced and dampened with bitumanised heavy Al foil and Dacron. There is no Xover but connect direct to the amplifier. Grills attach magnetically are best removed when speakers are in use. I'm extremely pleased with these simple and inexpensive drivers, so much from so little.