Help ! Underwater headphone build for Excal

[bigdave195412]

Years ago I had one of the older model (sword) Excaliburs. They came with headphones from Bilsom. They were the most comfortable headphones minelab ever used on the Excal. I found a pair of Bilsom viking v3 sound protectors I want to make into underwater headphones for my excal. I want to find piezo speakers with the best frequency response to separate the Xcal tones. I also have no idea what the impedance needs to be and how to match the impedance to the output of the excal. Any help anyone could give, would be appreciated.

I realize I could just convert my original excal headphones, but I want to keep them for emergency spares.

 

[OldBeechnut]

Years ago I had one of the older model (sword) Excaliburs. They came with headphones from Bilsom. They were the most comfortable headphones minelab ever used on the Excal. I found a pair of Bilsom viking v3 sound protectors I want to make into underwater headphones for my excal. I want to find piezo speakers with the best frequency response to separate the Xcal tones. I also have no idea what the impedance needs to be and how to match the impedance to the output of the excal. Any help anyone could give, would be appreciated.

I realize I could just convert my original excal headphones, but I want to keep them for emergency spares.

I use these piezo's here on all of my headphones, the loudest out there...also the backing plate has a huge affect on the loudness so you may have to play with that.

http://www.digikey.com/product-detail/en/pui-audio-inc/APS4812B-LW100-R/668-1190-ND/1738483

 

[bigdave195412]

Thanks. After a lot of research, I found some of your older posts on this and other forums. I decided to go with the audiosears 2463 speaker and fully waterproof it for diving. I just need to determine what I need to do for impedance matching for the Excal.