I made the change from C7es3 t0 M30.1 and for me the change was a significant upgrade. I posted my thoughts at the Harbeth forums in this thread. - which you may have already seen(?).
In a nutshell these are my thoughts. The C7es3 is a very good speaker in its own right, but the M30.1 is simply better. The 30.1 offers much more refinement, delicacy and purity in the treble ranges. This is immediately obvious.
Perhaps partly due to the tweeter used, the 30.1 plays with less strain on loud passages and sounds more dynamic. It also sounds tauter and faster on the bottom - more startle factor - and truer and more authentic through the midrange. There is greater tonal density and solidity to images. It presents a more exact and spacious soundstage.
Most importantly it sounds more like real music to me.
Whether the attributes of the 30.1 are worth the cost is a decision only the potential purchaser can make. I'm aware that the 30.1 is quite expensive in the US and there are many choices at its price point. Listen for yourself and then decide.
In a nutshell these are my thoughts. The C7es3 is a very good speaker in its own right, but the M30.1 is simply better. The 30.1 offers much more refinement, delicacy and purity in the treble ranges. This is immediately obvious.
Perhaps partly due to the tweeter used, the 30.1 plays with less strain on loud passages and sounds more dynamic. It also sounds tauter and faster on the bottom - more startle factor - and truer and more authentic through the midrange. There is greater tonal density and solidity to images. It presents a more exact and spacious soundstage.
Most importantly it sounds more like real music to me.
Whether the attributes of the 30.1 are worth the cost is a decision only the potential purchaser can make. I'm aware that the 30.1 is quite expensive in the US and there are many choices at its price point. Listen for yourself and then decide.