Harbeth 30.1 upgrade from C7ES-3 Question

I'm on same boat as you ,and pull the trigger and got the M30.1.
my room as start is small 9x10 both with C7 and M30 ,me listen at moderate level but not too loud.
the C7 give me the bass I want in smaller room ,
but the midrange on M30 is what I love ,is so natural ,I lost some bass but found lively sound .
that is what I sacrifice for ,also most I listen is vocal Jazz ,female singer is unbelievable on M30.1 .
now my listening room little bigger is 10x12,you can check my system here.
PS: If money not problem go for it !

It’s more like a slam dunk difference rather than upgrade to me. Best if you can listen to the M30.1 before taking the plunge as it sounds quite different from the C7ES3. Although the M30.1 is technically a superior speaker, I prefer the presentation of the C7ES3. With vocals and small ensembles the 30.1 may have the edge though, sounding richer and more lifelike than the C7ES3.

Donjr - similarly I find speaker stands to make a difference on Harbeth speakers. I have tried heavy 4-pillars with top and bottom plates (24" and 16") and lightweight open-frame stands(17"). The SHL5 Plus sounds different when placed on all these stands. Intrigued by your remark on the Q Bricks, I went over to the Skylan site to check these things out. I would have to say, the description of the Q Bricks is rather rhetoric, "vibrations are completely annihilated". Who would have expected the Q Bricks to make the speakers sound like someone covered them with a blanket when they are supposed to open up a new soundscape.

I now have both the C7s and the M30.1s in house. Don't know that I'm hearing a $1200 difference. Giving up bass for a degree of purity of midrange is a tricky trade.

I echo what some of the others have said. I am not sure it is a worthy upgrade if it is in fact is an "upgrade". You will lose the bass to gain mid-range which may or may not be something you want to do. I owned the C7's for a month before returning them for 30.1's. My musical tastes are soft jazz and female vocals so 30.1's work well enough for me. For more dynamic rock music, these speakers are so lacking in bass that I am thinking of supplementing them with a subwoofer. If I wanted to upgrade from the C7's I would jump another level to the SHL5's or the pluses.