The Deafener and Tinnitus

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17th October 2009, 10:27 PM
richard4u2

i dont think it is the defender that is causing the problem i think it is the motor on that boat , best you sell it , i got $10 in my pocket :D
18th October 2009, 09:00 AM
bosvit

Quote:

Originally Posted by richard4u2

i dont think it is the defender that is causing the problem i think it is the motor on that boat , best you sell it , i got $10 in my pocket :D

Thanks mate I will take that into consideration.....:)

Thanks for all your replies guys, especially the info on Tinnitus. Going to the doc next week about it.

Just some more quick info, in Adelaide but moving to Pt Lincoln in about 6 months. 2001 Td5 228,000km, recently had new axles and flanges and the TC was fine.

And I have two sets of tyres for it already, one off road Michelin XZT and some crappy soon to be replace Firestone ASR's.

Most of the noise is coming through the firewall, and up from the gearbox area as you would expect. I have spoken to my mechanic who is very switched on with Land Rovers and basically everything is about as quiet as he can make it without spending ridiculous dollars for only minor improvements. He seems to think I need to spend a fair bit of coin on sound proofing, which I am happy to do if it works, hence asking the question has anyone actually fitted a kit like this or similar?

Once again thanks for all the help and ideas.

Cheers
Brett
18th October 2009, 10:15 AM
Captain_Rightfoot

I've often wondered about this. When I worked for Telstra they said the maximum safe exposure was 80db for 8 hours. I'm pretty sure the interior of a defender is well over this.

I've got a db meter app for my iphone. I'll run this when I'm out in the defender this afternoon. I don't think I'm going to like the results.

I've worn noise cancelling headphones in our defender and it does make the interior much quieter. It doesn't help with family bonding though :)

Is there any such thing as electronic noise cancelling for the whole interior of a car? :)
18th October 2009, 12:26 PM
slug_burner

Quote:

Originally Posted by Captain_Rightfoot

I've often wondered about this. When I worked for Telstra they said the maximum safe exposure was 80db for 8 hours. I'm pretty sure the interior of a defender is well over this.

I've got a db meter app for my iphone. I'll run this when I'm out in the defender this afternoon. I don't think I'm going to like the results.

I've worn noise cancelling headphones in our defender and it does make the interior much quieter. It doesn't help with family bonding though :)

Is there any such thing as electronic noise cancelling for the whole interior of a car? :)

Yes there is noise cancelling for the interior of a car using the sound system. I think Lotus had a car a few years ago that came out with such a system.
18th October 2009, 12:29 PM
Captain_Rightfoot

I googled it and found some references to a few systems, but none seemed to be commercially available. Hmmmm....
18th October 2009, 09:36 PM
flagg

I have some of these:

David Clark H10-13X Headset - MyPilotStore.com

They work austoundingly well. With them on, I can hear the radio as loudly as if they were off, but I can't hear any engine dronning noises. I can still hear other mechanical noises like bearing noises etc.

They are also great when I'm flying :D:D

In all seriousness though, If most of the noise is coming through your firewall:

Have you fitted the tru-fit bonet underlay? Are all your boots and gromets intact? Can you see the road through any seals / lack of seals around the doors or anything? How good are the seals around your front vents? Are they closing properly?

I have an Isuzu 110 and most of the noise comes through the firewall. When invesitgating this I took out the radio and noticed that I could actually see the engine from inside. Several gromets had perished completly.. annoying but it they are cheap to fix and will make a big difference. Most of the noise in a defender should be the wind.
18th October 2009, 10:28 PM
rar110

Quote:

Originally Posted by Michael2

Hi bosvit,

Have a look at the Wright Off Road acoustic matting in the http://www.aulro.com/afvb/90-110-130...efender-5.html link.

https://www.aulro.com/afvb/images/im...009/10/584.jpg

This made a noticeable improvement to my Isuzu 110. Also, check the foam under the gearstick boot. I have replaced mine with pieces of noise insulation laminated together which also helped reduce noise entering the cab. My 110 is not quiet but I can now hear the radio.
19th October 2009, 07:31 AM
Captain_Rightfoot

I checked yesterday, and with the vents closed, AC off, and kids and wife temporarily silenced (!) my defender is 82 db at 60kph. Given that it's a db meter on an iphone and not calibrated this should be a guide only. I'd imagine it would be close to 90 at 100 but I'll check when I have the opportunity to do those speeds.
19th October 2009, 08:42 AM
abaddonxi

Quote:

Originally Posted by Captain_Rightfoot

I checked yesterday, and with the vents closed, AC off, and kids and wife temporarily silenced (!) my defender is 82 db at 60kph. Given that it's a db meter on an iphone and not calibrated this should be a guide only. I'd imagine it would be close to 90 at 100 but I'll check when I have the opportunity to do those speeds.

http://www.aulro.com/afvb/technical-...und-check.html
19th October 2009, 10:00 AM
Offender90

Quote:

Originally Posted by Captain_Rightfoot

I've often wondered about this. When I worked for Telstra they said the maximum safe exposure was 80db for 8 hours. I'm pretty sure the interior of a defender is well over this.

The Australian OH&S regulation criteria for noise exposure are 85 dB(A) energy averaged over an 8 hour period (LAeq,8hr), with a 3 dB "trading rule" (i.e. doubling the exposure time, decreases allowable loudness by 3 to 82 dB(A) and and halving it (to 4 hr) increases to 88 dB(A). That said, there is no definitive "safe exposure" limit, as hearing damage can occur at exposures below the OHS regulated limit.

Quote:

Originally Posted by Captain_Rightfoot

I've got a db meter app for my iphone. I'll run this when I'm out in the defender this afternoon. I don't think I'm going to like the results.

Is there any such thing as electronic noise cancelling for the whole interior of a car? :)

Nope. Waste of time and money. Active noise control is extremely difficult to achieve globally (i.e. throughout the entire car), and even then, the reduction is generally not significant.

Quote:

Originally Posted by slug_burner

Yes there is noise cancelling for the interior of a car using the sound system. I think Lotus had a car a few years ago that came out with such a system.

It was probably a marketing gimmick - I'm very doubtful as to how well it worked.

Quote:

Originally Posted by Captain_Rightfoot

I checked yesterday, and with the vents closed, AC off, and kids and wife temporarily silenced (!) my defender is 82 db at 60kph. Given that it's a db meter on an iphone and not calibrated this should be a guide only. I'd imagine it would be close to 90 at 100 but I'll check when I have the opportunity to do those speeds.

The'd probably be good for +/- 3 dB(A) (at best). Car noise will increase approximately 1 dB(A) for an increase of 10km/h over the range of 60km/h to 100km/h, so you'd be looking at around 86 dB(A) at 100km/h.

Cheers

Bojan

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