Noise levels in Defenders - Defender Source
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  #1  
Old September 16th, 2015, 12:49 AM
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Noise levels in Defenders

So I know a long time D owner in the northeast that uses earplugs when driving his 110 300Tdi. I myself have always found my own 110 pretty noisy though never bothered with ear plugs. So the other day I downloaded a decibel reader app for my phone (i know, they are not supposed to be super accurate). I measured the dB levels of my LR3 cruising at highway speed on road-bias tires and about 2000 rpm, and then did the same with my 110 300Tdi at same speed and rpm on mud terrain tires. Results were surprising:
LR3: 80-85dB
110: 85-90 dB
So the 110 was barely any noisier in dB terms even though it "sounds" way more noisy. Makes me wonder a bit how much gain one can hope for with extra sound proofing in a D when even an LR3 is still 80 dB. I would have expected something more like a 30 dB spread between the two vehicles.
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  #2  
Old September 16th, 2015, 12:56 AM
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Don't forget that the dB scale is logarithmic therefore 5 -10dB is significantly louder, as you had originally presumed.
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Old September 16th, 2015, 01:02 AM
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Yeah, it's like the richter scale.

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  #4  
Old September 16th, 2015, 01:08 AM
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80dB in an LR3 doesn't sound right to me. That's really loud.

Is it possible that the app is inaccurate or responding to some specific part of the spectrum?
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Old September 16th, 2015, 01:09 AM
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Mine's deafening at highway speeds. I wear dc's so that I can talk to my passengers and listen to music. Sure, I'm a dork, but I feel like a fireman ;-) But that's an ST with MT's and glass packs for ya!

------ Follow up post added September 15th, 2015 10:17 PM ------

Quote:
Originally Posted by sonoronos View Post
80dB in an LR3 doesn't sound right to me. That's really loud. Is it possible that the app is inaccurate or responding to some specific part of the spectrum?
He forgot to mention that he was listening to Danzig at the time.

But in all seriousness, where was the point of observation? Was the 110 a clean roof or did the lr3 have any ferring or rack?
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Old September 16th, 2015, 01:35 AM
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Well, I find in both that at highway speeds the main noise is from wind and tire noise, so perhaps that contributed to the 80 dB of the LR3. I just was surprised at how close they were. It sure seems like the mud tires are significantly louder for tire noise, and yet the app seems to not register much difference. 110 has full roof rack, LR3 smooth roof.

The app is called Decibel 10th. I'd be curious to hear what readings others get if you try it (app is free). It says average quiet home is 50 dB and sure enough that is what I am getting here in my living room at 2 am LOL.
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  #7  
Old September 16th, 2015, 01:42 AM
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That's just bizarre for a clean roofed LR3, or other slipstreamed RR, to be making that much cabin noise. If the point of observation was hand held (identically) in both trucks, then I'm stumped.

Another non scientific, but interesting measure nonetheless, is to simply record the same test and play it back for yourself. This will show you the acoustical disparity that the app is trying to quantify. Your "naked ear" might notice the "real" difference.
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Old September 16th, 2015, 07:18 AM
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Main noise for me at speed comes from tires, exhaust, any t-case or other drive noise, and wind. Not sure in which order to put those in though.
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  #9  
Old September 16th, 2015, 08:14 AM
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Given the boxy nature of early Rover coiler models (RRC, D1, D90/110) with a full roof rack, for me with windows open the noise goes like this:


1. Tires with M/Ts as truck starts out
2. Exhaust especially on current RRC with NRP exhaust as speed picks up
3. Rack as speed increases
4. General wind noise from open windows and rack at cruise speed which is usually 65


Radio is turned up so loud to try and block the noise can't talk with wife and the Labs have their heads out the window anyhow.
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Old September 16th, 2015, 08:25 AM
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I seem to remember that a 5 DB increase is actually twice the loudness (ie. 85 db is actually twice as loud as 80 db). 80 DB still seems high for an LR3 (though about right for a my ST D90).

Car and Driver recorded a 66 db at 70 mph cruise when they tested the LR3..


I wear ear plugs on long highway trips. The soft top is actually quieter without a top, then with the top on (lots of flapping noise) at highway speeds..
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Old September 16th, 2015, 09:25 AM
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Old September 16th, 2015, 09:27 AM
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Quote:
Originally Posted by LRNAD90 View Post

I wear ear plugs on long highway trips. The soft top is actually quieter without a top, then with the top on (lots of flapping noise) at highway speeds..
Me too, although I find the truck quietest with the drop curtain in...probably because it helps cut down on exhaust noise a bit. The rear loadspace mat made a huge difference as well many years ago.

There was a great thread on this a few years back where we were getting readings from various trucks - I'll see if I can find it.
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  #13  
Old September 16th, 2015, 09:30 AM
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I use a DB app on an iphone. Before I started work on quietening the truck, the worst part of its noise was a body boom. As I went through the truck was amazed at the number of holes to the outside world that I discovered. Even found a missing grommet to the engine bay. Working in reverse order I've dynamatted the rear tub in prep for some truck mat rather than rubber mat.
That alone stopped the "body boom" that I was being tortured by. DB dropped from 97 max to 91-2 max when crusing.

Another thing I noticed when measuring, when fixed to its holder, its reports more noise than when hand held.
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Old September 16th, 2015, 09:34 AM
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Quote:
Originally Posted by rijosho View Post
There was a great thread on this a few years back where we were getting readings from various trucks - I'll see if I can find it.
Found it. Great thread.

http://www.defendersource.com/forum/...ure-23234.html
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Old September 16th, 2015, 09:34 AM
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In the 1960s one of the Land Rover advertisements read something like:

The only sound you here in a Royals Royce at 60 MPH is the ticking of the clock.
The only sound you hear in a Land Rover is the roar of the engine, the wine of the gearbox, the vehicle vibration, the wind noise, the road noise, the creaking of the road springs, then the print kept getting smaller as the list continued.
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Old September 16th, 2015, 09:53 AM
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Quote:
Originally Posted by rdavisinva View Post
In the 1960s one of the Land Rover advertisements read something like: The only sound you here in a Royals Royce at 60 MPH is the ticking of the clock.
What a great ad! "Heard that!" ;-)

But I'd rather hear it all and feel alive than listen to the clock remind me of time slipping away.
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Old September 16th, 2015, 10:05 AM
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The parts falling off this Land Rover are of the finest british quality. I need to pull over. That's a 'new' rattle coming from under the truck.
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Old September 16th, 2015, 10:17 AM
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Old September 16th, 2015, 10:19 AM
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I thought about it. I'd like to see some real numbers posted again and then we can link them.
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Old September 16th, 2015, 10:27 AM
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