Zeagle Doesn't Know the Words

[Capt.Gene]

Without water pressure against the diaphram it acts like a kazoo when you exhale. Without dampening it can vibrate.
With some practice you can be quite entertaining. You just need to polish your routine.

 

[nait hadya]

the minuscule gap between the purge button and the diaphram was the source of the vibes. can't be adjusted out,though a thicker diaphram may eliminate the kazooo effect...lol

 

[Capt.Gene]

You could add a couple more diaphrams and they will no longer vibrate.
Alternately, you might try only diving the regulator when underwater.

 

[mattjm]

MY Dive Rite RG-2500s will do something similar if I take a deep breathe on the surface...as stated before the lack of dampening allows the diaphragm to move around too much...I wouldn't worry about it if the reg is otherwise performing properly and has been properly serviced.

 

[oreocookie]

I had a rental ScubaPro reg do that to me on a recent trip to Bonaire, but it wasn't exactly humming and I'm not sure a kazoo is the right word for the sound but my pre-dive checks quickly became: one breath, it works, good. ... Now I'm considering buying a Flathead 7, maybe I should get use to the pre-dive sound effects...

With some practice you can be quite entertaining. You just need to polish your routine.

I might have to try that if the opportunity presents itself. I can make a tune blowing on a blade of grass between my thumbs, so why not a reg? lol