The Nissan Note 1.4 is not a noisy car but I want to improve the interior in this respect.
I am technical and understand that an increase in noise power of 3dB indicates a doubling of noise power (which is just about perceived by the logarithmic ear) and that an increase of 10dB gives a perception of a doubling of "noise".
The noise power measured near my ear in my car is about 70dB at 50mph and this is an acceptable level. What I'd like to do is to add sound reducing material in a scientific way, aimed precisely at the noise source, which in this case is mainly road noise and engine noise when accelerating hard but mainly road noise when cruising at motorway speeds.
The "specialists" in this subject of whom I am aware seem not to be all that technical and apply a one-size-fits-all approach to sound reducing, rather than analysing, even briefly, each case in order to apply a specific solution.
Is there anybody out there who has or knows of somebody who has experience and has a scientific approach to effective sound reduction?
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Not an answer to your question, but having just got a 1.4 Note I don't find the noise in any way worthy of note :-}.
I am no expert but I suspect most of the noise, as you say is from the road and tyres. To reduce this you may need to upgrade the suspension and engine connections to the bodywork as well as add more sound insulation to the body panels. To produce any great improvement I would imagine could be a very difficult and / or expensive task.
I would think that Nissan has spent a lot of time and effort in reducing noise levels in the cabin during the car's development, reaching a fair compromise regarding insulation methods, cost, weight and space to produce a reasonable noise level for the class of car.
Perhaps even just fitting different tyres may improve things a little.
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I would strongly suggest that, as the above contributor says, different tyres should be your number one consideration. As an aside; isn't it wonderful to hear someone wants a quieter car! I remember Clarkson saying the car he was driving could be heard 2 miles away; idiot.
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On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB. Here are some common sounds and their decibel ratings. As has been said, road noise is the enemy then engine bay sound insulation. Then perhaps an underlay sound proofer under the carpets or buy and Audi A6. Regards Peter
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