Dynaudio 9S

Got the 9s since I already have the LYD-7s from Dynaudio - they say the 9s was created especially for the LYD series of speakers so it was an easy choice for me.
And a good one, too! The sub is tight, punchy and rather detailed as most sealed designs are.
Build quality is good and just what you'd expect from a sub at this price point. Don't be fooled by the 9.5" woofer, it plays well in small rooms(up to medium ones) I did prepare a bit before getting it: some bass traps in the front corners and installed REW plus measurement mic. After unpacking I spent a bit of time with the placement and measurements to get it the sweet spot and phase and time aligned with the main speakers, it was a bit of work, but you do it once every now and again, so it's fine.

It's weird to review a sub by itself as it's supposed to part of a bigger system. Now that I've integrated it properly with my lyd7s I think it's better to talk about the system as a whole now that the 9s was added:
The bass goes lower(no surprise there). Soundstage is now deeper(taller to be precise) more natural. Low mids are now cleaner/less muddy. Mids and low mids have better transient response, are less compressed, more detailed. Everything is just better across the freq range. The lower bass extension is only half the story, the other half is the speakers being released from bass duties and really shining on the rest of the range.
The difference is not subtle, either. I really feel that I made an upgrade.
Now, you may want to take all of this with a grain of salt, as speakers with high crossover frequencies like the LYD7s, Neumann KH 120 II or Barefoots which are all at around 4khz, do benefit way more from unloading the bass duties to a subwoofer then most speakers, that usually have the crossover at about 1.7 to 2.2khz.(but the later also benefit, don't be worried)
Conclusion: The sub is good, just what I expected, it's the only sealed solution in that price range which makes it a no brainer even if you don't have the matching speakers or high crossover ones.
I highly recommend!
Cheers!

Well i paired this sub with BM5 MKIII , it feels that lacks power and doesn't merge good with my BM5s.
I moved it all around the room, tried different adjustments on crossover and gain but did not help. Maybe this is not the best pair for BM5 MKIII with my room accoustics, the BM5 MKIII sounds way much better standalone on full range than 9S + BM5 with HPF on 80Hz or 60Hz.
Another mention is that the first 9S that i received , out of the box, it had a rattling noise coming from the voice coil if the volume was above 50%, but it was easily replaced by Thomann - good and reliable services from them.

I own this sub for few months now and I must say it is worth buying. Low frequency response is great and what is most important the bass is really detailed. Although a bit smaller than bm9s II, which I also own, it is definite step up. As always with Dynaudio the build quality is also great. I think that it is one of the best subs for small to medium sized studios in this price range that you can buy.