Dynaudio 18S

This is an amazing sub.

It's mind-boggling how something of this size can reach so low and do it with such speed and authority.

I've owned 12", 15", even 17" that cannot reach this low. Sure, a 15+ will move more air an, but for a studio? You won't need more power than this - and the speed and precision it has can hardly be matched.
It compares favorably with a 15" Servo motor sub (Rythmik).

The integrated DSP is the cherry on top. I use an external DIRAC processor (and thus leave all processing disabled) but the advantage of being able to integrate it the proper way without additional equipment is very welcome (yes, it's precofigured to make it easier with dynaudio monitors, but you can configure it crossover precisely by hand).

For whatever reason very few subwoofers have proper, selectable low pass AND high pass filters. The one integrated in the 18S has selectable slopes, which is a great bonus.

I was conflicted between one 18S and two 9S... I'm still not sure I made the right call, considering I'm not taking advantage of the DSP at all, but I can always add another one and the performance is so good that living with my decision isn't hard at all.

I've been using Dynaudio LYD 48s for a few months now with an old Blue Sky sub. The LYD 48s are capable of going down to 32 Hz, but they just don't carry much weight down there and the Blue Sky sub helped. I love the sound of the LYD 48s, but holy #$&! the 18s improved my system dramatically. If you can afford the 18s, go for it. You won't regret it. Living in the US, ordering it from Thomann saved me hundreds of dollars too. I asked Sweetwater to price match & they told me that I should order from Thomann because there's no way they could come close to that price. Happy camper here.

Ich hab' mir den Subwoofer gekauft, weil meine regulären Studimonitore Dynaudio BM5 erst bei 50 Hz anfangen und selbst meine Kopfhörer tiefere Töne bringen. Und siehe da: endlich höre ich auch einen Techno-"Rumble". Die Einstellung ist übers Display komfortabel - auch die BM5 sind als Voreinstellung verfügbar (das fehlte auf der Hersteller-Website an Information). Mit dem Bass kann ich jetzt Wände einreißen ... lediglich fürs "Home Theatre" beim Filme gucken muss ich mit einem externen EQ die Bässe etwas runterfahren, da sonst beim Filme gucken Explosionen auch die Nachbarn umhauen.