How to Get the Feedback Resonator in Subnautica 2

TL;DR

• The Feedback Resonator is an upgrade to the Sonic Resonator, not a separate tool — you need the Sonic Resonator first.
• You must scan two fragments to unlock the blueprint before you can craft it.
• Fragment 1 is in the Cicada Wreck Therapy Room, above the Upper Generator Control Room at the Karakorum Power Plant.
• Fragment 2 is at the Karakorum Metal Farms, beside the first green pool you encounter in the area.
• Both locations are roughly 850 meters northeast of the Alien Ruins Research Base at a compass bearing of 60–75 degrees, around 450 meters deep.
• You need the Tadpole Depth Module Mk. 1 to reach the area.
• Crafting requires: 1x Sonic Resonator, 2x Enameled Glass, 2x Conduit Crystal, 2x Strontium — assembled at the Modification Station.
• It fires sonic projectiles at range and is the only way to destroy armored Bloom Cankers.

The Feedback Resonator is one of the most important tool upgrades in Subnautica 2. The moment you find Bloom Cankers that close up and shrug off your regular Sonic Resonator shots, that is the game telling you it is time to get this upgrade. Without it, several mid-to-late game obstacles become impossible to clear and story progression stalls completely.

This guide walks you through both fragment locations, every material you need, where to find them, and how to put it all together.

What Is the Feedback Resonator?

The Feedback Resonator is an upgraded version of the Sonic Resonator, enhanced using Axum alien technology. Instead of just breaking ore deposits up close, it fires a small but powerful sonic blast projectile in any aimed direction. This projectile has an effective range of 25 meters, after which it disappears in a small controlled explosion.

Its main purpose is destroying armored Bloom Cankers — reinforced biological growths that your standard Sonic Resonator cannot damage. It also continues to do everything the base Sonic Resonator does, including breaking large resource nodes, making it a full replacement rather than just a niche tool.

It also plays a direct role in the Angel Comb puzzle in Subnautica 2, as clearing the bloom infestation around the Angel Comb requires this upgrade specifically.

What You Need Before Going

Before making the trip, sort these out first:

• Sonic Resonator — The Feedback Resonator is a direct upgrade, not a standalone item. The Sonic Resonator is a required crafting ingredient, so you cannot build the upgrade without having the base tool in your inventory first.
• Tadpole Depth Module Mk. 1 — Both fragment locations sit around 450 meters deep. Your base Tadpole only reaches about 250 meters. Without this upgrade, you will not get close. See our guide on how to go deeper with the Tadpole Depth Module in Subnautica 2.
• Enough oxygen — The journey is long. Make sure you know how to increase your oxygen in Subnautica 2 before heading out.
• Healing items and food — The area is dangerous with multiple aggressive creatures. Check our list of best early food sources in Subnautica 2 to stay prepared.
• Repair Tool — Useful for keeping your Tadpole in good shape. See how to get the Repair Tool in Subnautica 2.

Where to Find Both Feedback Resonator Fragments

You need to scan two separate fragments to unlock the Feedback Resonator blueprint. Both are located in the same deep northeastern region of the map, so you can grab both in a single trip.

Fragment 1 — Cicada Wreck Therapy Room

The first fragment is inside the Cicada Wreck, in the Therapy Room, located above the Upper Generator Control Room at the Karakorum Power Plant. This is near the Blackbox Singh signal route.

To reach it, head roughly 850 meters northeast from the Alien Ruins Research Base on a bearing between 60 and 75 degrees. The area gets very deep — park your Tadpole near the cliff face or tucked behind cover once you arrive. Do not leave it exposed in the open, as hostile creatures will attack a vehicle left unprotected.

Enter the wreck on foot and navigate to the Therapy Room above the Generator Control Room. Scan the Feedback Resonator fragment inside to add the first half of the blueprint to your Databank.

Fragment 2 — Karakorum Metal Farms

The second fragment is at the Karakorum Metal Farms, in the glowing green abyssal pool area — the same location where you find Troilite in Subnautica 2.

From the first fragment location, continue through the area. You will find the second fragment right beside the first green pool you encounter as you enter the Metal Farms zone — it sits next to a table alongside some stacked barrels on the left side edge of the pool. A third confirmed location also exists: cross both ooze pools heading east, and on the second ridge you will find a table with random equipment and another fragment.

Scan it to complete the blueprint. At this point, the full Feedback Resonator schematic is unlocked and you can head back to craft it.

Bonus tip: While you are in this area, it is worth collecting Troilite from the Mineralized Clinker nodes, grabbing the Metal Farm blueprints by scanning the pillars, and collecting Axum Bacterial Culture from the pools. All of these are needed for later progression and you are already there.

Navigating the Area Safely

The Metal Farms zone is one of the more dangerous areas in the game. Here is what to watch for:

• A Collector Leviathan patrols above the pools. Stay close to the seabed at all times. If you hear the music signal indicating it has noticed you, hide your Tadpole behind the alien structures or Metal Farm structures immediately.
• A giant squid-type creature patrols near the entrance to the pool zone. Do not bring your Tadpole past the entrance — leave it parked outside and go in on foot.
• Multiple aggressive sea creatures patrol the floor and will attack you once you exit the Tadpole.

All Crafting Materials for the Feedback Resonator

Once both fragments are scanned, head to your Modification Station and select Prototype Tool Modification. The full recipe is:

• 1x Sonic Resonator — the base tool, already in your inventory from earlier progression
• 2x Enameled Glass — crafted at the Fabricator using Glass and Creature Enamel
• 2x Conduit Crystal — found near the Angel Comb cliffs and alien structures in the deep eastern zone
• 2x Strontium — processed at the Configure Processor using Celestine

Here is how to get each material:

Enameled Glass

Enameled Glass is crafted at the Fabricator by combining standard Glass with Creature Enamel. You need 2 pieces total, which means 2 Creature Enamel and enough materials for 2 Glass.

Creature Enamel deposits are found approximately 280 meters southeast of the Alien Ruins, at bearing 150. Look for node clusters along the rock faces in that area. Watch out for Needler Mango creatures nearby — they throw darts and can slow you down. Aim your Sonic Resonator at the dark mineral mass at the base of each node rather than the protruding prongs, as the prongs can cause shots to miss.

See our full guide on where to find Creature Enamel in Subnautica 2 for more detail.

Conduit Crystal

Conduit Crystal is one of the rarer resources in the game. It is found in the deep eastern zone, specifically on the cliffs below the Karakorum Power Plant overlooking the Angel Comb, at depths between 300 and 400 meters. Crystals also spawn on ledges and walls near other alien structures in the same region. They look like coral dipped in metal — small, easy to miss, and often on only one side of a rock face, so change your angle frequently.

You need 2 Conduit Crystals for this recipe. Since crystals spawn alone and often yield only 1 per node, plan to collect at least 5–6 on your trip to cover this recipe and future crafting. Read our complete guide on where to find Conduit Crystal in Subnautica 2 for all confirmed spawn locations.

Strontium

Strontium is not found directly in the ocean — it is processed at the Configure Processor using Celestine. You need 2x Celestine to produce the Strontium for this recipe.

Celestine is fairly common throughout the eastern Karakorum region. There are plenty of nodes near the Feedback Resonator fragment locations themselves, so collect it during the same dive. Look for glowing grayish-blue mineral formations around the alien structures. Our guide on how to get Celestine in Subnautica 2 has more detail on spawn spots.

How to Craft the Feedback Resonator

With all materials gathered, here is the full step-by-step crafting process:

1. Collect 2x Creature Enamel from southeast of the Alien Ruins
2. Craft 2x Glass at the Fabricator (requires Quartz — see our guide on how to get Quartz in Subnautica 2)
3. Combine each Glass with 1 Creature Enamel at the Fabricator to make 2x Enameled Glass
4. Collect 2x Celestine from the eastern Karakorum region
5. Process the Celestine at the Configure Processor to produce 2x Strontium
6. Collect 2x Conduit Crystal from the cliffs below the Karakorum Power Plant
7. Go to your Modification Station
8. Select Prototype Tool Modification and choose the Feedback Resonator
9. Craft using: 1x Sonic Resonator + 2x Enameled Glass + 2x Conduit Crystal + 2x Strontium

The Feedback Resonator replaces the Sonic Resonator in your inventory. Your Sonic Resonator is consumed in the process, so there is no going back — make sure you are ready for the upgrade before committing.

What the Feedback Resonator Does

The Feedback Resonator keeps everything the Sonic Resonator could do and adds two major new abilities:

• Ranged sonic projectile — fires a blast in your aimed direction with an effective range of 25 meters. This is the key difference from the base tool, which only worked up close.
• Destroys armored Bloom Cankers — the standard Sonic Resonator cannot damage these shielded growths at all. The Feedback Resonator is the only tool that can break them, which is essential for clearing paths and progressing through the Angel Comb area.

It also continues to work on large ore deposits just like the original Sonic Resonator, so you lose nothing by upgrading. The Harvest large resource nodes guide covers what you can still mine with it — see how to harvest large resource nodes and clear Bloom Biofilm in Subnautica 2.

Common Issues and Fixes

The Feedback Resonator is not working on Bloom Cankers

Make sure you are actually using the Feedback Resonator and not the base Sonic Resonator. The two tools look similar. Check your inventory and confirm you have the right one equipped. Also, make sure you are firing from distance — the projectile needs range to function. Do not stand directly on top of the Bloom Canker when firing.

Cannot find the fragment locations

Open your inventory with Tab, go to Signals, and check your marked locations. Use your compass to aim for around 60–75 degrees northeast of the Alien Ruins Research Base and descend as you travel. The green glow of the Metal Farms pool area is visible from a distance once you are close enough.

Blueprint not unlocking after scanning

You need to scan both fragments — one scan alone is not enough. Confirm in your Databank that both have been registered before heading back to craft.

Tips for an Efficient Trip

• Collect everything in one dive. The fragment locations, Conduit Crystals, Troilite, and Celestine all spawn near each other. One well-planned trip can get you all the materials and both scans at once.
• Set beacons on confirmed spawn spots. Once you find a Conduit Crystal cluster or the exact fragment positions, drop a beacon so future trips are faster.
• Park the Tadpole before entering the pool area. The giant squid near the pool entrance will attack your vehicle. Leave it safely outside and swim in on foot.
• Stay low at all times. The Leviathan patrols high above the area. Hugging the seabed keeps you well below its patrol path.
• Build a Modification Station at your base before going. See our guide on what to build in your base first in Subnautica 2 so everything is ready when you return.

Final Thoughts

The Feedback Resonator is not optional at a certain point in Subnautica 2 — it is the progression key. Bloom Cankers block paths, the Angel Comb needs clearing, and the regular Sonic Resonator simply will not cut it anymore. Once you know where to go and what to collect, the whole process becomes a single focused dive into the northeastern deep.

Scan both fragments at the Karakorum region, collect your Conduit Crystals, Creature Enamel, and Celestine in the same run, process your Strontium back at base, and you will have the Feedback Resonator ready to craft at the Modification Station.

Playing on Subnautica 2 on Steam or Subnautica 2 on Xbox Game Preview? Check out our full Subnautica 2 best early upgrades and progression path to plan out everything coming next.