Sometymes less is more... - Page 2

Sidney · 14th August 2005, 19:18

Temp & sound measurements are keys, but at the very least it certainly looks clean and sexy

14th August 2005, 19:46

My digital soundmeter (radioshack) shows 23 db (c weighted) 3' from the front, 21.5 from the side.
Room temp. is 76.4f/case temp. is 83f/cpu temp (running Prime 98 for 20 minutes) is 105f.
Measurments on MBM5. tnv

jmke · 15th August 2005, 00:12

c weighted does not reflect humar hearing; do you have a weighting also?

15th August 2005, 01:26

It has both, but the instructions included with the unit said to use "c" and so that's what I did. Sorry, I'll cheque and post the "a" weighted reading shortly. tnv

15th August 2005, 02:07

I called a friend who is a sound eng. and asked him why the "c weighted" measurment was recommended by Radioshack if it wasn't within human usable range. He explained it as follows:
The A, B and C weightings mainly differ in the degree of sensitivity at lower frequencies, relative to 1000Hz. The least sensitivity to lower frequencies is provided by the A-scale, the most by the C-scale. The D-scale gives an indication of perceived noisiness and is used in aircraft noise measurements.
So, as I understand him, using the "c weighted" was correct, since I was measuring a wider freq. then the "a wighted" and I can hear well below 1000hz. If anythng, the "c weighted" reading would actually have a higher db reading then the "a weighted" reading tnv

jmke · 15th August 2005, 11:44

Quote:

Since A weighting is thought to provide the most accurate model of how the human ear perceives loudness, and noise that causes hearing damage correlates most closely to the A curve, the A network is usually specified in federal government regulations established by the Occupational Safety and Health Administration (OSHA)

http://www.termpro.com/articles/hearing.html

15th August 2005, 22:11

Thanks for all the info. The next tyme the Occupational Safety and Health Administration (OSHA) visits my house to cheque for hearing damage caused by my computer...I will make sure they're using the "a weighted" scale on their meters. However...unless the neighbors complain...I don't think I will be visited by them in the near future. I'll visit this forum sometyme again in the future. tnkx...tnv

14th August 2005, 19:18	#11
Sidney Member Join Date: Mar 2004 Posts: 15,738	Temp & sound measurements are keys, but at the very least it certainly looks clean and sexy __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

14th August 2005, 19:46	#12
tnvtnv Posts: n/a	temps and db My digital soundmeter (radioshack) shows 23 db (c weighted) 3' from the front, 21.5 from the side. Room temp. is 76.4f/case temp. is 83f/cpu temp (running Prime 98 for 20 minutes) is 105f. Measurments on MBM5. tnv

15th August 2005, 00:12	#13
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,022	c weighted does not reflect humar hearing; do you have a weighting also? __________________

15th August 2005, 01:26	#14
tnvtnv Posts: n/a	c vrs. a It has both, but the instructions included with the unit said to use "c" and so that's what I did. Sorry, I'll cheque and post the "a" weighted reading shortly. tnv

15th August 2005, 02:07	#15
tnvtnv Posts: n/a	a vrs. c revisited I called a friend who is a sound eng. and asked him why the "c weighted" measurment was recommended by Radioshack if it wasn't within human usable range. He explained it as follows: The A, B and C weightings mainly differ in the degree of sensitivity at lower frequencies, relative to 1000Hz. The least sensitivity to lower frequencies is provided by the A-scale, the most by the C-scale. The D-scale gives an indication of perceived noisiness and is used in aircraft noise measurements. So, as I understand him, using the "c weighted" was correct, since I was measuring a wider freq. then the "a wighted" and I can hear well below 1000hz. If anythng, the "c weighted" reading would actually have a higher db reading then the "a weighted" reading tnv

15th August 2005, 22:11	#17
tnvtnv Posts: n/a	thank you Thanks for all the info. The next tyme the Occupational Safety and Health Administration (OSHA) visits my house to cheque for hearing damage caused by my computer...I will make sure they're using the "a weighted" scale on their meters. However...unless the neighbors complain...I don't think I will be visited by them in the near future. I'll visit this forum sometyme again in the future. tnkx...tnv