What is the CONTROL Resonant Subwoofer / Complete Set puzzle?

The Complete Set Altered Item quest places SINKKI speakers and a Subwoofer in the Auction House. Place the Subwoofer in water, shut down the other speakers, then turn the Subwoofer off or up — both choices grant Untapped Bout Guard in guide tables.

CONTROL Resonant Complete Set

Quick answer: Searches for CONTROL Resonant subwoofer / speakers / Complete Set mean the Altered Item side story The Complete Set (not a retail edition). Collect the SINKKI speaker set + Subwoofer, place them on the correct surfaces in the Auction House, then choose to turn the subwoofer off or up — reward tables list the same Untapped Bout Guard either way.

How to start

Talk to Langston at the Central Field Office about the speaker set. He points you into the Oldest House / Executive Research area and grants clearance as needed.

Speaker / Subwoofer ritual

Gather all speakers + Subwoofer; return to the Auction House layout table.
Read The SINKKI D50 Speaker Set note — each speaker needs a specific surface type in the room.
Place the Subwoofer in water (mop-bucket puddle behind the possessed civilian in guides).
Shut down the regular speakers when they pulse (wait for pauses), then face the Subwoofer choice.

Turn off vs turn up

Off: civilian dies immediately. Up: multiple voices occupy the body (non-hostile; FBC pickup flavor). Guides report same Bout Guard reward — narrative preference only.