How to Install Spa Speakers with Gecko in.stream 2 – Complete Guide Audio Systems

How to Install Spa Speakers with Gecko in.stream 2 – Complete Guide Audio Systems

Upgrading Your Spa Audio: Installing a Spa Speaker With the Gecko in.stream 2 System

If you’re upgrading or repairing your spa’s audio system, the Gecko in.stream 2 is one of the most complete multimedia units on the market.
It offers Bluetooth streaming, FM radio, USB, AUX inputs, and supports up to 4 speakers and 1 subwoofer in a high‑efficiency Class‑D amplifier design. 

This guide covers the installation of the under‑shell mounted spa speaker, and also explains how it integrates with compatible components such as:

  • SpaTFX transducer speaker (surface‑mount, no cut‑outs required) 
  • MS56s waterproof box subwoofer, designed for spa and marine environments 

🔧 How the System Works Together

Gecko in.stream 2 Audio Station

The in.stream 2 is a fully splash‑proof audio amplifier module that delivers clean, rich sound and supports Bluetooth wireless streaming. It can power multiple speakers and a dedicated subwoofer to create a full spa audio environment.

SpaTFX Transducer Speaker (Optional Upgrade)

The SpaTFX is a waterproof tactile transducer designed to mount under acrylic surfaces with no speaker grille visible. It transforms the spa shell into an audio emitter.
It’s marine‑grade, waterproof, and optimized for spas and swim spas. 

MS56s Waterproof Subwoofer

The MS56s is a compact, high‑efficiency bass enclosure designed specifically for spas, pools, and marine applications.
It provides deep bass down to 40 Hz and includes a UV‑stable housing and dual‑voice coil driver

Installing the Under‑Shell Spa Speaker

The speaker is mounted underneath the spa shell so it remains hidden and protected from water. Below is the process shown in the diagram.

1. Prepare the Mounting Area

Locate the correct position under the spa edge where the speaker will be installed.
Clean and lightly sand the fiberglass surface to ensure proper bonding.

2. Prepare the Metal Plate

The speaker comes with a metal mounting plate attached using a bolt. Install the bolt so it points downward, as shown in the illustration.

3. Bond the Metal Plate Under the Shell

Apply fiberglass filler to the top of the plate and firmly bond it to the underside of the spa shell.
Hold or support the plate until the filler begins to harden, then allow full curing.

4. Route the Speaker Cable

Before attaching the speaker, ensure the audio cable has a clean path towards the in.stream 2 module.
Anchor the cable securely to avoid strain.

5. Screw the Speaker Into Position

Once the metal plate is fully bonded:

  1. Align the speaker with the downward‑pointing bolt.

  2. Screw the speaker upward until snug—do not overtighten.

  3. The speaker should now sit directly under the spa shell, facing the ground.

6. Final Testing Once installed:

  • Confirm the plate is firmly bonded

  • Check for any movement

  • Test the speaker using the Gecko in.stream 2 control (Bluetooth/FM/USB)

  • Adjust audio levels as needed

🔊 Optional: Enhancing Your Audio With a Subwoofer

The MS56s waterproof subwoofer integrates easily with the Gecko in.stream 2 system and dramatically improves low‑frequency sound performance.
Its compact, weather‑resistant housing makes it ideal for mounting inside the spa cabinet. 

✔ Final Thoughts

By combining:

…you can transform your spa into a high‑quality entertainment experience.

This setup ensures:

  • Clean audio without visible speaker hardware
  • Waterproof and durable components
  • Rich bass response
  • Modern Bluetooth streaming and media control
24 February, 2026 0 views