upgrade Dynaudio Special 40 to Kef Reference 1

We are a Kef dealer so yes we are going to be biased, however, the Kef Ref 1 in our opinion will be a substantial upgrade.

Tale of the tape Dyanudio vs Kef Ref 1

Dynaudio is a two way vs Kef Ref 1 a true three way

Kef Ref 1 offers very deep bass for a monitor sub 40 hz bass vs 41hz bass for the Dyaudio.

The Kef is a 40lb monitor vs 18 lbs for the Dynaudio

The Kef is a true point source the Dyaudio is not.

The Kef is room tunable via port selection the Dyaudio is not.

The Kef is the more transparent lower coloration speaker based on the Kefs more advanced metal drivers and driver construction.

The Dynaudio speakers are very musical and do sound excellent, the Kefs will produce more detail, a larger and more focused soundstage.

Dave and Troy
Audio Doctor NJ Kef dealers

The real question is what are you trying to do?
Changing the speakers will be an apples to oranges change.the Kefs are more transparent, more dynamic, and less colored, they also go lower and sound bigger, they also image with both a large and well focused sound stage.

The Dyanaudio loudspeakers are richer in the midrange, with a bit less treble detail, they do sound big for a small monitor.
Changing your electronics or dac will or may bring out more from the loudspeakers.
Op what makes you think the Yamaha amplifier is any better than the Hegel Just the contrary the Hegel's clean, dynamic sound would be excellent with the Dyaudios, the Yamaha may actually make the system sound too sleepy and less exciting.
The best thing you can do is to figure out for yourself what I am trying to accomplish? If you are craving more detail, a bigger sounding loudspeaker and deeper bass, then the Kef is for you,

If not stick with the Dyaudios and maybe you need to look at an even better dac or source upgrade.
The other thing is that there are a zillion great loudspeaker choices even in a smaller room a set of compact floor standing loudspeakers may be the ticket.
Dave and TroyAudio Doctor NJ