At the levels predicted by the study, or louder, race car noise will be disruptive in homes located near the track. (Unless those homes have exceptional construction, which does not appear to be the case). That’s not personal opinion, that’s the appropriate conclusion to draw from the data.

Noise from aircraft using ABIA is audbile in this area, but not comparable levels from the race cars at homes near the track. You can find a copy of the latest ABIA noise contour map in several documents online, and you can see that the 65 DNL contour is a considerable distance from the track. DNL and SPL aren’t directly comparable, DNL is a 24-hour average and SPL is a single event, but you can get a decent sense of what noise exposure from ABIA is like based on the map.

Naturally aspirated or turbo, remember that these engines put over 900 HP to the transmission. That’s going to be loud no matter what kind of air handing they utilize.

Normal conversation levels are in the 65 dBA range. If there is another, intruding noise that is also at 65 dBA, then the conversation becomes difficult to continue as there is another noise that must be talked over.

An outdoor noise at 80 dBA would absolutely be noticeable indoors, even with the windows shut. The typical outdoor to indoor noise reduction provided by a building is 20 dBA. More for a high quality construction with sound rated windows, less for cheaper construction. In remote areas like this, construction tends to be towards the cheap side with respect to noise insulation, which is to be expected. Why spend any money on high STC windows when there aren’t any noise sources to worry about?

A lawn mower may be 107 dBA 3 feet away. That would mean it is ~103 dBA 6 feet away, and about ~99 dBA 12 feet away. Remember that sound spreads geometrically. For race car noise from a track that is hundreds or even thousands of feet away to be greater than 80 dBA is very significant. It will be that level everywhere around a house, not just in a sphere around one machine. In other words, even with similar levels of exposure, the amount of sound energy the house is exposed to is considerably more, since all of its surface area is exposed to the same intensity.

Even so, I would be curious to visit your house, since apparently it is built like a bomb shelter and has no windows. A lawn mower being operated in my yard is always noticeable. A lawn mower being operated in my neighbor’s yard is noticeable. This is not surprising, as I do not have STC 45 windows on my house.

A dial tone is 80 dBA when the receiver is held up to your ear, centimeters away from the speaker. You cannot lift a receiver and produce an 80 dBA tone throughout a room, unless you have a very loud phone that would inflict permanent hearing damage on anyone who attempted to use it. Remember that sound spreads geometrically, and that distance from the source is just as significant as SPL. 3 feet from a phone the dial tone will be audible, but it will be nowhere near 80 dBA.

A jet engine can absolute cause sound levels to exceed 120 dBA, NEAR the jet engine. Miles away sound levels are much less. Find a copy of the ABIA airport noise contours and you will see that the 65 dBA contour is far away from the Formula 1 site. Airplane noise at this location will not be comparable to race car noise for homes close to the track.

The SoundPLAN software takes frequency into account for its noise propagation calculations. Air and ground absorption are absolutely frequency dependent, and those effects have already been accounted for in this analysis.

That being said, no clue what it will do to livestock.

A normal conversation is usually measured between 60-70 db, not a loud conversation at 65db.

Also, an outdoor sound at 80db would be barely noticeable indoors with the windows shut. A typical phone dialtone registers at 80db, hardly a conversation stopper.

A mower, 3 ft away registers at 107 db, much louder than a typical conversation but, once again, indoors, hardly noticeable.

These homes are very close to the airport and the typical jet on takeoff can hit well over 120db.

Don’t get me wrong, at the track, you will need hearing protection, which I use at any race but, once you get very far away, the noise will just fade out. F1 cars are typically very high pitch which fades rapidly.

http://www.gcaudio.com/resources/howtos/loudness.html