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Old 8th February 2004, 03:49 PM   #11
Ron E is offline Ron E  United States
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Quote:
Is that on IEC A or C compensation switch position? slow or fast?
If your question is related to my post, this is C weighted. The slow or fast reading does not affect the RCA output, it merely damps the meter response...
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Old 8th February 2004, 05:16 PM   #12
Salas is online now Salas  Greece
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Default my RadioShack

Hello,

This is what I use as a mic compensation file in WinMLS 2000. It shows much positive bass output deviation. Its a fact though, cause I have compared to a friend's well calibrated mic (professional loudspeaker designer) with the same program taking alternate measuements on the same setup. Also in RTA programs I get much bass on the graph if I dont compensate that much. Setting is C. Analogue RS spl meter RCA out.

"Radio Shack low cost condenser mic (Salas)"
"Hz" "Data"
20.0, 35.0
40.0, 12.0
55.0, 11.0
80.0, 8.0
100.0, 6.0
120.0, 5.0
200.0, -0.5
300.0, -0.3
400.0, -1.0
1000.0, 1.0
1100.0, -1.0
1300.0, -1.0
2000.0, 0.5
3000.0, 1.5
4000.0, 4.3
5000.0, 2.0
6000.0, 4.7
7000.0, 3.0
8000.0, 3.4
9000.0, -2.0
9500.0, -2.5
10000.0, -3.0
12000.0, -2.5
13000.0, -4.0
15000.0, -6.0
18000.0, -5.5
20000.0, -6.0
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Old 8th February 2004, 05:26 PM   #13
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I have found the SPL corrections published in several places, all the same. Your bass corrections are grossly exagerated I think, 35Db at 20 HZ?. I don't know where you got these, what is the origin?
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Old 8th February 2004, 05:36 PM   #14
Ron E is offline Ron E  United States
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Interesting, what is the model #? Mine is 33-2050 - purchased a long time ago (in 1990?)

I don't think the Behringer is out that much, so there must be substantial variation in the RS SPL meters...

I haven't checked mine in the bass.
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Old 8th February 2004, 05:46 PM   #15
Salas is online now Salas  Greece
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Default here's a pic

Hello,

As I wrote I got em compared in a friends calibrated professional setup. The reason I did that it was that I kept getting too much bass in the graphs in all programs when I used all those readings I found on the web.
I include I a pic I made just now. The top graph is my PC speaker left channel + sub (Cambridge Soundworks) without any compensation used. The bottom one is the same but compensated with the file I sent before. Radioshack analogue set to C. These thingies must variate wildly I guess.
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Old 8th February 2004, 05:52 PM   #16
Salas is online now Salas  Greece
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Default to RON E

Yes cat. no. 33-2050 'CHINA'
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Old 8th February 2004, 05:52 PM   #17
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Salas,

Is your radio shack SPL meter, the anaolg or digital, how old is it?
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Old 8th February 2004, 05:57 PM   #18
Salas is online now Salas  Greece
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Default relatively new

Its the analogue, roughly 3 years old, purchased in the USA
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Old 8th February 2004, 06:06 PM   #19
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I'm confused.

Your post says add 35 Db at 20HZ. But your "compensated" graph shows 15Db LESS at 20 HZ (goes from 5 to -10).
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Old 8th February 2004, 06:10 PM   #20
Salas is online now Salas  Greece
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Default Nooo....

The upper one reads roughly - 8@20 when the bottom one dives under -30@20
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