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Old 04-10-2016, 10:22 PM   #57
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Here's some screenshots of my app. It's probably useful to take a baseline reading, such as total silence. In my house, that's about 28 dBA on this app. Keep in mind this is not a scientific study. Apps, readings and measurement techniques will make a difference. But if enough people contribute it might still be informative
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Old 04-10-2016, 10:22 PM   #58
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Quote:
Originally Posted by jondrew View Post
I forgot, also take a "baseline" measurement at each position. I.e. Engine off, no accessories running
Please specify exactly where each measurement is to be taken, otherwise this is an exercise in futility.
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Old 04-11-2016, 05:18 AM   #59
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Quote:
Originally Posted by Ray,IN View Post
Please specify exactly where each measurement is to be taken, otherwise this is an exercise in futility.
My previous post specified it was at the drivers heads position. From what I can tell, the exact position seems to have little effect on the readings.

Originally Posted by jondrew View Post
I finally have some measurements on my Discovery. I did not get a chance to "play" around much, so the measurements are kind of limited. All measurements taken with Dash AC off, generator off and the meter held at the drivers head position.
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Old 04-11-2016, 09:05 AM   #60
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The noise in my gasser right now, is almost exactly the same as the Winnebago Tour sitting 2 sites down and the 2 Foretravels sitting in the next row. And the class C in front of me, and the TT behind me.

And where do most people spend 95% of thier time in a Motorhome?
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Old 04-11-2016, 10:48 AM   #61
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Readings

Take readings in drivers seat, at rear of coach and outside near the engine on a gasser.
Now do the same on a DP.
I know the results without even checking my meter.
Might want to do the stink test while you are at it. spill a drop of gas and diesel fuel on your pants and see which will stay with you longer.
Be happy with what you have chosen. Each have their benefits either plus or minus.
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Old 04-22-2016, 08:25 AM   #62
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Had to go to the alignment shop today. Gave me a chance to take a few more readings without the family in the coach. No AC, no tv, no generator, no jabbering.
It was also fairly calm on the wind front.
All readings were taken at the drivers head position and in dBA scale

Silence ( engine off ) 31.2
Engine idling 45.5
45 MPH 63.7
65 MPH 70.0

Virtually all the noise seems to be wind noise, some from my mirror and some from the windshield. I'm pretty sure the windshield noise is much louder since I had the windshield replaced. I need to have the guy come back out and check the gasket.
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Old 05-22-2016, 06:22 PM   #63
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here you go...
2016 Winnebago v-10 6 speed pulling a 22' loaded trailer...
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Old 05-22-2016, 06:26 PM   #64
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Quote:
Originally Posted by jondrew View Post
Had to go to the alignment shop today. Gave me a chance to take a few more readings without the family in the coach. No AC, no tv, no generator, no jabbering.
It was also fairly calm on the wind front.
All readings were taken at the drivers head position and in dBA scale

Silence ( engine off ) 31.2
Engine idling 45.5
45 MPH 63.7
65 MPH 70.0

Virtually all the noise seems to be wind noise, some from my mirror and some from the windshield. I'm pretty sure the windshield noise is much louder since I had the windshield replaced. I need to have the guy come back out and check the gasket.
I was 73 in the v-10 @65 and 70 @55

here's how loud that is in real life

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Old 05-23-2016, 05:07 AM   #65
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Nice... Thanks. Be interesting to compare your meter to the readings I get with my phone.

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Originally Posted by LVRVLUVR View Post
I was 73 in the v-10 @65 and 70 @55

here's how loud that is in real life

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Old 05-23-2016, 10:21 AM   #66
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On a nice smooth, flat, straight divided highway, driver front seat, using IPad with sound meter app.
62-66 db. @ 60 mph.

Have done a few projects recently that have helped the noise level
1. Replaced three panel ( rattle box.) sliding shower door, with hinged magnetically sealed door
2. DW bought padded dish sleeves movers use, for dishes. Big difference in noise.
3. I have added insulation board to exterior walls inside cupboards. For insulation, seems to help noise
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Old 05-30-2016, 04:43 PM   #67
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Sound levels can only be compared when taken with the same instrument. So you can see relative improvements in your rig, but relating to another persons numbers is a waste of time. Front end noise is mainly due to wind pressures, these are not aerodynamic vehicles. Wind pressure value changes with the square of velocity, so headwind v tailwind makes a huge technical difference in noise level (and fuel economy). Insulate as best you can and live with it.
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Old 05-31-2016, 07:40 AM   #68
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Sound levels can only be compared when taken with the same instrument. So you can see relative improvements in your rig, but relating to another persons numbers is a waste of time. Front end noise is mainly due to wind pressures, these are not aerodynamic vehicles. Wind pressure value changes with the square of velocity, so headwind v tailwind makes a huge technical difference in noise level (and fuel economy). Insulate as best you can and live with it.
I think we all agreed from the start this is grossly unscientific.

I've enjoyed reading everyone's posts, have seen some great ideas.
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Old 06-01-2016, 08:08 AM   #69
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FWIW it is also not true that using different instruments is automatically bad data. It depends on calibration and response at the frequencies involved. Duplicate measuring devices and the science of Metrology is what the business of calibration to standards is built around.
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Old 06-04-2016, 12:18 AM   #70
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Sound levels can only be compared when taken with the same instrument. So you can see relative improvements in your rig, but relating to another persons numbers is a waste of time...

This whole thread is a waste of time.
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