Reducing the bubble noise of open circuit ?

[rhwestfall]

There was no video. The sound difference was very clear. But which one was which? Was the first one the Xtream and the second the Kraken?

as I said, it's audio... yes, first minute is SH Xstream, and second minute is metal bodied PRAM...

 

[guyharrisonphoto]

Thanks Bob

Sound of the DH was much nicer, to my ears anyway. which is interesting because I dive an Xtream.

 

[tbzep]

Poseidon has side exhausts.
Apeks has both "long" and "short" exhausts.
There's also double hose regs that exhaust bubbles behind you (I think).

I'd say that's about it.

I use an OTS full face mask which has a side regulator. It is loud in my left ear to the point that I catch myself tilting my head to lessen the "impact" of the bubble noise. I have a feeling the Poseidon may have a similar effect unless it releases smaller bubbles.

 

[guyharrisonphoto]

Ive never noticed that one ear noise is worse than the other with the Poseidon compared to standard regulator designs. I used to dive Apeks.

 

[Javik]

What you're talking about is basically the way doublehose regs work. The 2nd stage is in the can behind your head, the mouthpiece has one-way valves on each side attached to the hoses. One hose brings air from the 2nd stage, one hose vents exhaust back to the cans. This way there is a complete loop and the intake/exhaust are at the same depth. The dead air space is not an issue because exhaled air goes into the exhaust hose via a one-way valve and cannot mix with fresh air from the other hose.

Eh, I do not like the double-hose corrugated hoses. Although I have never used them I can tell just by looking at them that:
- airflow is restricted by turbulence from the corrugations, which is why the diameter needs to be so huge
- If you get water in it, every one of those corrugations forms a small circular well to trap water

People are probably using those giant corrugated hoses because "Sea Hunt" / nostalgia, and back when double hose was used the material technology of the time sucked so corrugations were the only solution to inflexible tough materials.


I really do not care about "corrugation" nostalgia at all. I want performance. I have a tiny ultraflexible 2nd regulator hose with a free floating swivel so the hose isn't constantly trying to yank the regulator out of my mouth and causing jaw strain....

Using the same smooth-wall modern flexible hose technology with a gimbal on a dual hose would probably allow a diameter reduction to half the size of the antique corrugated style, without any increase in flow restriction, and no more water trapping wells all along the length of it.

 

[Bryan@Vintage Double Hose]

Eh, I do not like the double-hose corrugated hoses. Although I have never used them I can tell just by looking at them that:
- airflow is restricted by turbulence from the corrugations, which is why the diameter needs to be so huge
- If you get water in it, every one of those corrugations forms a small circular well to trap water

People are probably using those giant corrugated hoses because "Sea Hunt" / nostalgia, and back when double hose was used the material technology of the time sucked so corrugations were the only solution to inflexible tough materials.


I really do not care about "corrugation" nostalgia at all. I want performance. I have a tiny ultraflexible 2nd regulator hose with a free floating swivel so the hose isn't constantly trying to yank the regulator out of my mouth and causing jaw strain....

Using the same smooth-wall modern flexible hose technology with a gimbal on a dual hose would probably allow a diameter reduction to half the size of the antique corrugated style, without any increase in flow restriction, and no more water trapping wells all along the length of it.

 

[halocline]

Eh, I do not like the double-hose corrugated hoses. Although I have never used them....

Maybe someday you will try one and then you can have an opinion that's actually based on something.

 

[Javik]

$600 is a bit much to blow on a piece of technology that isn't commonly used anymore and I will have to teach myself to use watching Youtube videos.

Though if I go this route, then no one had better damn well complain if I buy a Hollis MOD 1 FFM off Amazon and teach myself to use that open circuit without any professional FFM training either.

 

[rhwestfall]

 

[Nemrod]

I spend a fair amount of time inverted like this looking under rocks for lobsters, taking a picture, or just testing my trim weighting (I try to set myself up so that I can hang motionless vertically head-down, vertically head-up, or horizontal). Is the difference a big one with the Kraken?

All regulators have positional differences. Said before, if one is not willing to learn a new normal then one should stay with what they know. N