# Step 4: Install the Speaker

> Seat speaker 100_13X in the front torso opening and secure it with four socket bolts.

- Page: https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/torso-assembly/step-4
- Section: Asimov › Asimov 1 › Assemble Asimov 1 › Assemble › Torso Module › Torso Assembly
- Previous: [Step 3: Install the Neck Yaw Actuator](https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/torso-assembly/step-3.md)
- Next: [Step 5: Attach the Arm Modules](https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/attach-left-and-right-arms/step-5.md)

> [!IMPORTANT]
> **Assign actuator IDs before assembly**
>
> Assign and verify all 25 actuator IDs before assembling the robot. The robot will not work correctly with missing or incorrect IDs. IDs must be assigned one actuator at a time on the bench; you may need to disassemble the robot if you skip this step. See [Assign Actuator IDs](https://docs.menlo.ai/asimov/1/build/assembly-preparations/assign-actuator-ids.md).

## Parts needed

| Part | Count |
| - | -: |
| Torso assembly from Step 3 | 1 |
| `100_13X` speaker | 1 |
| M4x8 Socket bolt | 4 |
| 50 mm wire | 2 |
| WAGO connector | 2 |
| Approved soldering and insulation supplies | As needed |
| Threadlocker | As needed |

## Instructions

1. Take part `100_01C` and put it down such that the neck is facing upward toward the ceiling while the waist is pointing downward toward the surface. The hollow part should be facing away from you.

2. Take the speaker `100_13X` and a pair of 50 mm AWG26 wires to solder them onto the speaker as shown in the video below.

   Video: [How to solder wires to speaker](https://static.asimov.inc/manual/v1/videos/solder-speaker-ed2426da2074.mp4)

3. Take part `100_13X` (the speaker) and align it with the rectangular hole in front of the chest. Then, slot the speaker in the hole.

4. Take **4 of** M4x8 Socket bolts and lightly tighten into the 4 corner of part `100_13X` to align the part with Part `100_01C`.

5. After the parts are aligned:

   > [!NOTE]
   >
   > **Not ready to apply threadlocker?**
   >
   > You can assemble without threadlocker while you check the fit, alignment, and orientation. When you are confident, disassemble as needed, apply threadlocker to the bolts, and reassemble them following these instructions.

   - remove **4 of** M4x8 Socket bolts one at a time,
   - apply threadlocker,
   - then tighten them back to secure Part `100_13X` and part `100_01C` together.

6. Take the wire from the speakers and connect them to the WAGO as shown below.

   ![Inside the torso, the speaker's two wires joined to the speaker cable with orange WAGO lever connectors beside the speaker](https://docs.menlo.ai/manual/v1/images/torso-module/speaker-wire-wago.webp)