Can't decide

Buy a Harley instead...You'll thank me later...

I had a pair of Monitor Audio GS 10’s which were fine till I bought my ASR amplifier. The amp proved to be too much for the GS10 bookshelves. It was like a Tanzanian devil trying to break out of a small box. Then I pushed them too hard and blew out a woofer and tweeter which was an easy fix, as I just ordered replacements and installed them. So I ended up selling them to someone who was putting together a Rega system and the Monitor Audios worked really well in that scenario. The overall tone of these Monitor Audio speakers was good but I thought it was lacking a little in detail. Shortly after, Monitor Audio released their GR series, which they claimed to be an improvement. Then a couple years after that, they released their Platinum speakers and though I never heard those, the reviews for those were excellent. Anyway, I believe Monitor Audio has made improvements to their speakers over the years and would be worth auditioning but have a feeling that there are many others that would offer more within that price bracket.

Dynaudio!  My Contour 20i’s sound amazing with my Audionet electronics.  I replaced Revel Salon 2’s on a lark and never looked back.  I love the Contour 20i’s so much I have Confidence 20’s on the way to replace them.  The 20i’s used with stands for under 4k are a great value.

The  Parasound amp is good,  but I think a bit dark sounding to me.

Dynaudio Contour is a good match with Parasound because the latter tames some of that treble energy. 
 

But to me the MA’s have the better sounding tweeter and also pair well with Parasound. 

Have Monitor Audio Silver 300s in a second system. They are definitely not bright! In fact, too much bass unless carefully positioned in the room. I've never read any review describing MAs as being bright. Very good sound for the $.

The contour 20 black is far from bright , but it needs really good amplification to sound really good. 

Not convinced parasound can take it all the way 🙄

Atalante 3 monitors, designed by the guy who headed the team that designed the Dynaudio Contour 20. You'll save over half going for the Atalante 3.

All the best,
Nonoise

I know this isn't the question, but I'd go with Fritz Carbon 7 Mk. II SE's. Search around about them.

My Evoke 50's would sound excellent with the Parasound. The treble is more laid back and needs an amp that can waken them up. Class D really controls their immense bottom end too. 

DynAudio, outstanding speakers. Very neutral and impactful, accurate. Will reflect the electronics you put behind them.

I run Monitor Audio Gold (250?) with a Parasound A21+ and couldn’t be happier. Margo Timmons has never sounded lean on my system :-). Haven’t heard the Dynaudios but love the synergy in my system. Be My 2 cents worth. 

If not Dali Rubikore 2 then Dynaudio contour 20. 

I'd go with Dynaudio over Monitor Audio every time.

The Dynaudio didn't sound bright to me at all so don't know what the other commenter is referring too.

The Gold 100G actually has pretty good balance of tone just with some thinness that I heard during demo with Samara Joy's music and she doesn't have a thin vocal presentation. Like the heft and body was a bit lean. Outside of that, overall balance was acceptable.

Also your 706 S3 don't lose their brightness. You got used to it cos they're annoyingly brittle sounding whilst also lacking snap and pop to drum hits, brass instruments. It's like they sound muffled and harsh at the same time.

Any speaker you get will sound less contrasty to begin with and you may not like that compared to your 706 S3's more coloured presentation @spoonman16510 

The Monitor Audio is a bit lean, the Dynaudio is a step up and warm but not the best match with Parasound. It’s impossible to tell you what you will hear, only you would know 

I currently have a pair of B&W 706 S3 bookshelf speakers and those were considerably "bright " until they were good and broken in; about 100 hrs, but since then they have toned down quite a bit. I really have no way of auditioning either of these because I don't live anywhere near a dealer(s). So you're saying that the Dynaudios retained their brightness? Even after owning them for as long as you have? 

I have owned the Contour 20i's for 2 years, and I love them. But they are right at the edge of having a bit too much treble energy. The Heritage and Black Editions, both of which use the Esotar 3 tweeter, might push the treble too far, so I would definitely audition before purchasing. The same goes for the Monitor Audios. Lastly, the Blacks have 10Hz less bass extension compared to the 20s (50hz vs 39hz), so you might ask yourself if you're ok spending 8k on speakers that could possibly sound lightweight... I personally really need full output below 50hz. If you are interested in Dynaudios, I think I would hear the 20i's as well compared to the Monitor Audios...you very well might prefer them more.