One of the stranger side quests in Control Resonant starts innocuously enough: a note on a museum reception desk. What follows is a city-wide hunt for five SINKKI D50 speakers and a subwoofer, a possession ritual inside an Auction House, and a final choice that leaves nobody walking away happy.
The Complete Set is the kind of quest that rewards players who actually read the collectibles. Miss the "There's People in There" note inside the Auction House and you'll be wandering Manhattan without a map. Pick it up and the whole quest snaps into focus: three speaker locations, a subwoofer locked behind an FBC clearance keycard, and a ritual that needs all of them in the right place at the right time.
How the quest kicks off
The quest begins at the Museum of Curiosities in the West Incursion Zone. Examining a SINKKI D50 speaker at the back of the museum triggers its first escape attempt, and that sets the template for every speaker encounter that follows: wait for the speaker to pause its bouncing, then move in fast and hold the contain button (L1 on PlayStation, LB on Xbox) to suppress it. The window is tight, and the energy pulses will knock you back if you rush it.
From there, the trail leads to the Auction House in Downtown, where a possessed civilian and another loose speaker are waiting. Picking up the "There's People in There" collectible here reveals the remaining locations.
Where to find every SINKKI D50 speaker
The three remaining speakers are spread across Manhattan, and they can be collected in any order.
- The Collector's Apartment: The speaker isn't inside the apartment. Listen to the "Pete, Nina and Lester" collectible to learn it was thrown out, then cross the street to a construction site entrance. Check the dumpsters on the right. The speaker will bolt through the construction site once disturbed, so be ready to chase.
- The Auction Buyer's Apartment (Central): Check the shelves near the front door for an Exchange Location Note. It redirects you to a nearby coffee shop called Atlantis. The speaker is sitting on a table inside and will make a run for it the moment you interact with it.
- The Confiscated Subwoofer: This one requires a visit to Langston at the Field Office in Central. He points you toward the FBC Oldest House near Executive Research and hands over a new Clearance Keycard. Retrace the tutorial path to find the locked SR room next to the bunker. Opening it spawns a wave of Hiss enemies before the subwoofer itself needs containing.
Solving the Auction House ritual
Back at the Auction House with all five pieces, the puzzle is about surface types. The collectible "The SINKKI D50 Speaker Set" spells out exactly what each speaker needs to rest on, and all five surfaces are findable within the Auction House itself.
Once placed, shut down all speakers except the subwoofer. They'll pulse and push back, but there are pauses between bursts. After all four are off, speak to the possessed civilian.
The choice that defines the quest
Here's the thing: neither outcome is clean. The civilian asks you to turn off the subwoofer. Voices from inside the subwoofer ask you to turn the volume up.
- Turn it off: The civilian dies immediately. Quest ends. You receive the Untapped Bout Guard artifact.
- Turn it up: The civilian's body becomes a vessel for multiple confused spirits. They're not hostile, and Dylan notes the FBC will collect them. Quest ends. You also receive the Untapped Bout Guard artifact.
The rewards are identical either way. The Untapped Bout Guard, once unlocked back in the Gap, boosts power recovery by 50% but increases damage taken by 20%, so factor that into your build before equipping it.
What most players miss is the implication behind the choice. Turning the volume up opens "the Gate" that the speakers have been building toward, and the spirits possessing the civilian seem genuinely alarmed that something might come through from the other side. There's no follow-up quest that resolves this thread, at least not yet, which makes turning the subwoofer off the more narratively contained option.
The word SINKKI itself is Finnish (fitting for Remedy Entertainment) and translates to zinc, though it also carries connections to a medieval serpentine instrument. Whether that's a deliberate nod toward the Gate's nature or just a Remedy-flavored detail is left open.
For more on navigating Control Resonant's stranger corners, the full Control guides collection covers everything from Power Lines to Taxi puzzles. If you're building out a broader playthrough strategy, the gaming guides hub has you covered across the rest of your library too.
