R&T's Cabin Noise Numbers are WRONG!
#1
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I'm posting this because there is some really bad information in the almost all the stereo threads here based on what I think I can prove is a R&T typo.
The moment someone mentioned in the last stereo thread that Road and Track measured an 84db ambient noise level at a 70 mph cruise I knew it was wrong. In that same test they measured 84db at a constant 70 mph and 87db under max load in first gear. That's a 3 db difference between a 70 mph cruise and max load. No way. 3db is about the minimum spl difference the human ear can detect. Someone screwed up, probably a typo. C&D measured a 75 db from a 997 at a 70 mph cruise and the 991 is definitely better at keeping noise in check. Here is my evidence and I think it's pretty clear:
Car and Driver's 75db at 70 mph measurement from a 997 with a manual:
http://media.caranddriver.com/files/...ra-s-specs.pdf
Road and Track measured a 2010 GT3 at only 81db at a 70 mph cruise:
http://www.roadandtrack.com/content/...1-GT3_data.pdf
Oh look, Edmund's got 68db from the 991 at 70 mph, freaking amazing (which is why PSE is a must):
http://www.insideline.com/porsche/91...carrera-s.html
Edmund's measured a 2012 BMW 335 at 65 db @ 70 mph for comparison:
http://www.insideline.com/bmw/3-seri...and-video.html
Road and Track measured a GT3 RS 4.0 at 85 db at 70 and 94 db max first gear which essentially is twice as loud:
http://www.roadandtrack.com/var/ezfl...0acf3a2427.pdf
I mean, every single magazine has commented on how quiet and relaxed the cabin is in 7th gear at a cruise with the PSE closed so this is just common sense. That means the 991 is an ideal car to cruise around in with a nice sound system. 68db from Edmunds is absolutely outstanding! I couldn't tell the difference between the 991 and my A6 with the PSE disengaged.
So go ahead and get the good stereo!
The moment someone mentioned in the last stereo thread that Road and Track measured an 84db ambient noise level at a 70 mph cruise I knew it was wrong. In that same test they measured 84db at a constant 70 mph and 87db under max load in first gear. That's a 3 db difference between a 70 mph cruise and max load. No way. 3db is about the minimum spl difference the human ear can detect. Someone screwed up, probably a typo. C&D measured a 75 db from a 997 at a 70 mph cruise and the 991 is definitely better at keeping noise in check. Here is my evidence and I think it's pretty clear:
Car and Driver's 75db at 70 mph measurement from a 997 with a manual:
http://media.caranddriver.com/files/...ra-s-specs.pdf
Road and Track measured a 2010 GT3 at only 81db at a 70 mph cruise:
http://www.roadandtrack.com/content/...1-GT3_data.pdf
Oh look, Edmund's got 68db from the 991 at 70 mph, freaking amazing (which is why PSE is a must):
http://www.insideline.com/porsche/91...carrera-s.html
Edmund's measured a 2012 BMW 335 at 65 db @ 70 mph for comparison:
http://www.insideline.com/bmw/3-seri...and-video.html
Road and Track measured a GT3 RS 4.0 at 85 db at 70 and 94 db max first gear which essentially is twice as loud:
http://www.roadandtrack.com/var/ezfl...0acf3a2427.pdf
I mean, every single magazine has commented on how quiet and relaxed the cabin is in 7th gear at a cruise with the PSE closed so this is just common sense. That means the 991 is an ideal car to cruise around in with a nice sound system. 68db from Edmunds is absolutely outstanding! I couldn't tell the difference between the 991 and my A6 with the PSE disengaged.
So go ahead and get the good stereo!