Experiment on Road Noise during Commute - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 12 Old 06-22-15, 04:18 PM
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Re: Experiment on Road Noise during Commute

Quote:
XEagleDriver wrote: View Post
QUESTION:
RESULTS: Average dB was 99, low value was 74, and high value was 107
Wow, your Camaro's interior is really noisy. I only get around 70-75db average in my van driving mostly freeway to and from work using audio tools on my iPhone And it never peaks over 80db.

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Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

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Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
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post #12 of 12 Old 06-23-15, 06:53 AM Thread Starter
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Re: Experiment on Road Noise during Commute

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tonyvdb wrote: View Post
Wow, your Camaro's interior is really noisy. I only get around 70-75db average in my van driving mostly freeway to and from work using audio tools on my iPhone And it never peaks over 80db.
Tony,
It turns out the van is probably not quieter than the Camaro, but rather the iPhone App is a better SPL tool than the Android app I used.

REPEAT WITH SPL METER: On today's commute, I drove the same route and used the same method as previously stated, except I used a Radio Shack SPL meter (picture below) set to A-Weighting and Slow response as Talley suggested and the SPL (dB) readings were as follows:
- On the Interstates at ~68 mph readings of 70+/-2 dB;
- On smooth 2-lane Hwys at ~60 mph readings of 68+/-2 dB;
- On rough 2-lane Hwys at ~66 mph readings of 72+/-2 dB.

This analog meter does not capture highest/lowest values or calculate the overall trip average like the cell phone, but from what I observed the lowest was 60dB when standing still and the highest was ~76 dB when travelling over bridge seams at speed.

These values tracked much closer to what I was hearing, basically a quiet cab with audible pavement noise in relation to road quality.

I did toggle back and forth between A-Weight and C-Weight, as well as Slow and Fast response:
- C-Weight read a lot closer to the cell phone readings, but still reported ~10 dB less than the phone.
- Slow versus Fast did not appreciably change the peak readings, just the amount of needle movement.

CONCLUSIONS:
1) The phone app is C-Weighted and also inaccurate reading about +10 dB high (basically a toy).
2) The noise levels in the car most likely do not pose a significant risk, as they are well below the OSHA A-Weight standards Talley contributed.

Cheers,
XEagleDriver
Attached Thumbnails
Experiment on Road Noise during Commute-radio_shack_spl_meter.jpg  


Last edited by XEagleDriver; 06-23-15 at 06:56 AM. Reason: Can't typ[e worth . . .
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