Now that CC has had their hands on Centurion for 5 years...

[Skidave]

I have a DB meter and a spectrum analyzer with calibrated mic. Only problem, no Gs or Centurions around me. I need a good reason to burn a vacation day for myself if anyone can pull thus together in the mid-Atlantic region.

I'm wondering too, if the difference could be related to frequency. If the G has a resonance with the engine or tranny frequency, it will be louder. It could be a matter of resonance vs non-resonance.

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[vision]

I have a DB meter and a spectrum analyzer with calibrated mic. Only problem, no Gs or Centurions around me. I need a good reason to burn a vacation day for myself if anyone can pull thus together in the mid-Atlantic region.

I'm wondering too, if the difference could be related to frequency. If the G has a resonance with the engine or tranny frequency, it will be louder. It could be a matter of resonance vs non-resonance.

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The frequency may be a big factor. Good thought. It’s the noise from the transmission at wakeboard speeds that is the most noticeable to me.


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[Kenv]

So many factors in play all of which overlap...in no order:

• How much you paid for the boat
• How brand loyal you are
• How much you talk vs actually listen
• Which boat is really quieter
• How willing you are to admit something to yourself
• How willing you are to admit something to others
• How loud the stereo is on
• How old your ears are

What am i missing?

Oh COME ON...we are only really talking about item number 4....and that's it.....nothing more..nothing less...don't read into it too much.

[greggmck]

So many factors in play all of which overlap...in no order:What am i missing?

You are missing the only thing that matters to me, facts like measuring sound pressure levels.
Most of the list is too subjective.

[greggmck]

https://www.planetnautique.com/vb5/m...php?pid=556776

In this post I measured sound pressure in the 2018 G23 at the drivers seat to be 81.5 db while surfing. Curious to see what levels are measured in the Centurion.

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[Kenv]

https://www.planetnautique.com/vb5/m...php?pid=556776

In this post I measured sound pressure in the 2018 G23 at the drivers seat to be 81.5 db while surfing. Curious to see what levels are measured in the Centurion.

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Greg....the Centurion add on page 1 of this thread says 86.5 at the driver's seat while surfing.....Sooooo someone is high or low on the reading....if the Centurion is really quieter.

[jjackkrash]

I hate getting hit with cold hard SPL data when I'm arguing subjective impressions.

[Skidave]

If the DB meter(s) isn't calibrated, then its useless. Also, no one states what filter they are using. There is A weighting, C weighting and flat. Needs to be an apples to apples comparison.

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[vision]

If the DB meter(s) isn't calibrated, then its useless. Also, no one states what filter they are using. There is A weighting, C weighting and flat. Needs to be an apples to apples comparison.

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Agreed. Perception of loudness is incredibly frequency dependent.

One way or another, I hope Nautique works on dropping in cabin drive train noise.

No what is this I hear about the gen 3 hull having more bow rise...


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[jjackkrash]

A good place to fight about A weighting and C weighting is on AVS forum. The subwoofer subforum is always fun. But I do have a calibrated Dayton Omnimic, REW, and other SPL measuring software if anyone really wants to take db/frequency measurements and run a bunch of cool looking graphs. I'm betting most of the noise is between 100 a 4k Hz.

[greggmck]

One of my passions besides surfing is home theater. I have used this sound pressure meter extensively in my equipment setup. It has been calibrated against Dolby Atmos test equipment at my dealer. It could be off a few percent but it is very unlikely that it would register off by - 5db.

Here is the image I took when measuring the sound pressure in the 2018 G23.

[scottb7]

"radio shack" That brings back a lot of memories.

[Skidave]

A good place to fight about A weighting and C weighting is on AVS forum. The subwoofer subforum is always fun. But I do have a calibrated Dayton Omnimic, REW, and other SPL measuring software if anyone really wants to take db/frequency measurements and run a bunch of cool looking graphs. I'm betting most of the noise is between 100 a 4k Hz.

Me too. REW user for years.

I'm an audio nerd for sure. I build amps, speakers, tone controls, and so on. I test them all on my bench and plot distortion. I had so many Spectrum analyzers, I sold a few. I use REW, ARTA and HPWorks. All have their prime features.

You know your a nerd when you test sound cards for the best noise floor...

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[tdc_worm]

shooting from the hip here, but i think its something like:

to realize a 3db increase in spl requires a double of the energy, and a 10db increase in spl is perceived as twice as loud. just food for thought for anyone trying to interpret whatever numbers are reported back.

i will try to get a read today from my poorly calibrated app on my phone haha

[wood78]

[QUOTE=tdc_worm;n619157]

as long as we are in the spirit of making assumptions, one could assume that brand loyalists see things through rose colored glasses or that obedient brand ambassadors are incentivized to plant seeds of doubt and never miss an opportunity to denigrate the competition. but i'd rather stick to fact rather than fiction.

G25s dry weight is 6400lbs + sub floor 2200lbs ballast = 8600lbs
Ri237s dry weight is 5450lbs + sub floor 2850lbs ballast = 8300lbs (without PnP)
They both share the same 102" beam, but the longer boat will have longer wetted surface.

Using Archimedes principle we know that the volume of water displaced is equivalent to the mass of the boat. The G25's extra 1'5" in length likely makes its extra 300lbs of mass negligible because of its increased wetted surface. That is to say that it any difference in displacement is a rounding error. There are only so many ways you can drag a hole (or a hull, if you prefer puns) through the water. I've surfed both, and both were incredibly similar.....except for that PnP thing you mentioned. I have my preference, but this post isnt about d!ck measuring over wave size.

So, to put everyone at ease, here is how we surfed each:

G25 (paragon hull) - 3 adults on board (540lbs?), full ballast, 1400lbs of lead (400 each port and starboard stern, 400 port midship, 200 starboard midship)
Ri237 - 5 adults, (860lbs), full ramfill ballast (the boat DOES NOT HAVE PnP)

control boat: My 230 - with stock ballast, 750s plumbed in the rear lockers, arrow head plumbed in the belly (a boat WITH water isolating the engine compartmentt).

we lowered the Ri237 off the lift, used the ramfill to soak the tanks, went to surfing. It was by far the quietest. Second quietest was my 230 with fat sack isolation. Not only was the G the loudest of the three, it was the loudest of any boat we tested.

the important piece here is that CC owns technology that can make our experience better. i hope, on that, we can agree.[/QUOTE

Just from the ballast set up I would expect the G to be louder. 1400# of lead. Boat was probably turning 3700-3900 rpms vs a underweighted Ri. I have never been in a Ri without the pnp doesn’t seem like a common set up. The 550 motor boats are definitely quieter but most run the 450 Ho motor that is in no way whisper quiet when weighted with pnp and extra lead like the majority are.