It's very, very rare to see a 2-way design with larger than an 8" midwoofer. There are just so many compromises once you get bigger than that unless you have an unusually good-at-LF tweeter and a good waveguide to boot. About the only two that immediately come to mind are the Genelec 1032 and the Dynaudio BM15 - one of these is a good speaker, the other is honestly a bit of a mess because it completely lacks a waveguide.My criticism of the Genelec 8030c is non-specific and could be leveled at almost any speaker employing small drivers. 8" drivers are relatively small drivers to play bass notes, but they seem to be the maximum manufacturers want to provide for prices short of around $4000 a pair. Why? Is it really that much more expensive to produce speakers with larger drivers or satellite/sub combos for a reasonable price.
I tend to agree with one of the designers from ATC about this one:
You will notice that our largest bass/mid driver is 6.5”, [...] which we consider to be a practical limit in a 2-way. If the bass/mid driver was much larger the horizontal response around the XO would suffer as a direct result of the bass/mid driver becoming directional. More bass extension and higher SPL can be achieved by increasing the bass driver diameter but at some point you have to move to a 3-way system to continue to achieve a satisfactory off-axis response.
Of course it's worth noting that with a big enough waveguide you can get away with a bigger midwoofer than ~6.5" nominal, but it's not necessarily ideal.