# Is it safe to build a floatable speaker?

I'm thinking of building a floatable speaker to float along beside me in a lake or a small river while tubing. I've got some speakers and the following 12V amp:

DROK Amplify Module Audio Component Amplifier,TDA7297 (TDA7297 15W+15W)

and I was thinking of using a power bank capable of 12v output to power it, such as this:

XTPower MP-10000 External Battery Pack with 10000mAh using dual USB 5V and DC 9V / 12V 2A output

I was thinking of putting this all in a waterproof pelican box, drilling holes for the speakers, and putting a thin plastic membrane over the speaker cone to prevent water getting in, and throwing in a silica gel packet to absorb moisture. The speaker cones would also be covered by a metal mesh to protect the plastic membrane, and they would be silicone-sealed to the waterproof box. I'd have this floating along with me in a small river or a lake. Theoretically, no water will get in. So my questions are:

1. If water does get in, is it going to harm anyone in the water? I can accept damage to the hardware, but I want it to be safe.

2. I know lithium batteries don't mix well with water, and I think that's what is inside of power banks. I've seen waterproof power banks, but the only ones I can find can only put out 5V. Is there a better and safer power source?

3. Is this totally unsafe?

• I'd use a transducer to turn the whole case into a speaker. Might need tighter waterproofing though then. – Ignacio Vazquez-Abrams Jun 24 '16 at 3:53
• 12 volts is not a shock hazard, but you do NOT want the electronics getting wet or even damp. Even if turned off, you may need mild electric heating to keep salty moisture out. A desicate pack has its limits. Consider using speakers with polypropylene cones, which are water proof, and use a sealed enclosure. This is not an answer to all of your questions. – Sparky256 Jun 24 '16 at 6:35

You don't need to build anything, there are lots of floating waterproof sound systems available for a reasonable price (under $40) such as this one from Amazon: which has a rechargeable battery and Bluetooth. You can find others by searching for waterproof pool speakers. Put your Smartphone inside a$8 waterproof case and you're good to go.