SPL meter corrections?

masterp2 · 6th February 2004, 03:21 PM

Are there corrections for the "digital" RS meter somewhere? I don't have an analog meter.

officeboy · 6th February 2004, 03:27 PM

http://www.gti.net/wallin/audio/rsme...5/33-2055.html

masterp2 · 6th February 2004, 03:36 PM

Tanks for that link, which describes how to mod the meter. I won't be doing that. I don't see any corrections. Are they the same as the analog meter?

officeboy · 6th February 2004, 03:48 PM

hmmm, how else would you correct it? if not to physically correct it.. or are you looking for a calibration file?

masterp2 · 6th February 2004, 03:54 PM

yep, sorry. Is the calibration the same as the analog

masterp2 · 6th February 2004, 03:57 PM

Correction factors?

officeboy · 6th February 2004, 04:03 PM

Try this thread on the speaker workshop forums.
http://www.speakerworkshop.com/forum...ghlight=332055

Ron E · 7th February 2004, 01:51 PM

These are what I measured on-axis for my analog model from the RCA output (not the meter movement). I doubt the digital model is much different. A positive number means the meter response is too high and vice versa. This is a comparison to a Behringer ECM8000 rather than an actual calibration, but the ECM8000 is said to be +/- 0.5dB up to 10kHz and perhaps -3 at 20kHz.....

FWIW, this curve is quite close to one published by ETF acoustic, and also to the curve enclosed with the meter instructions.

200 0.1
214 0.3
230 0.3
246 0.3
264 0.2
283 0.2
303 0.3
325 0.4
348 0.4
373 0.5
400 0.5
429 0.5
459 0.5
492 0.4
528 0.3
566 0.1
606 0.0
650 0.0
696 0.1
746 0.2
800 0.3
857 0.5
919 0.5
985 0.4
1056 0.6
1131 1.0
1213 1.1
1300 0.7
1393 0.6
1493 0.6
1600 0.3
1715 0.2
1838 0.6
1970 1.6
2111 2.4
2263 3.1
2425 3.2
2599 2.6
2786 1.5
2986 1.4
3200 1.9
3430 2.5
3676 2.1
3940 2.1
4222 2.4
4525 3.1
4850 3.0
5198 3.3
5572 3.8
5971 4.6
6400 4.6
6859 4.2
7352 3.3
7879 2.6
8445 2.5
9051 2.0
9701 1.1
10397 -0.7
11143 -2.4
11943 -3.4
12800 -3.7
13719 -4.2
14703 -5.9
15759 -7.0
16890 -7.8
18102 -10.1
19401 -12.2
20794 -12.8
22286 -13.0

mikee12345 · 8th February 2004, 01:19 AM

just keep searching online-ive seen it.

its something like 1db at 50hz and 5db at 20hz...only worrysome if ur into subs...also rolls off after 10khz like ron E shows

get a wm-60
Cheers

Salas · 8th February 2004, 12:45 PM

Is that on IEC A or C compensation switch position? slow or fast?

6th February 2004, 03:21 PM	#1
masterp2 diyAudio Member Join Date: Feb 2002 Location: Arizona	SPL meter corrections? Are there corrections for the "digital" RS meter somewhere? I don't have an analog meter. __________________ Michael

6th February 2004, 03:36 PM	#3
masterp2 diyAudio Member Join Date: Feb 2002 Location: Arizona	Tanks for that link, which describes how to mod the meter. I won't be doing that. I don't see any corrections. Are they the same as the analog meter? __________________ Michael

6th February 2004, 03:54 PM	#5
masterp2 diyAudio Member Join Date: Feb 2002 Location: Arizona	yep, sorry. Is the calibration the same as the analog __________________ Michael

6th February 2004, 03:57 PM	#6
masterp2 diyAudio Member Join Date: Feb 2002 Location: Arizona	Correction factors? __________________ Michael

7th February 2004, 01:51 PM	#8
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	These are what I measured on-axis for my analog model from the RCA output (not the meter movement). I doubt the digital model is much different. A positive number means the meter response is too high and vice versa. This is a comparison to a Behringer ECM8000 rather than an actual calibration, but the ECM8000 is said to be +/- 0.5dB up to 10kHz and perhaps -3 at 20kHz..... FWIW, this curve is quite close to one published by ETF acoustic, and also to the curve enclosed with the meter instructions. 200 0.1 214 0.3 230 0.3 246 0.3 264 0.2 283 0.2 303 0.3 325 0.4 348 0.4 373 0.5 400 0.5 429 0.5 459 0.5 492 0.4 528 0.3 566 0.1 606 0.0 650 0.0 696 0.1 746 0.2 800 0.3 857 0.5 919 0.5 985 0.4 1056 0.6 1131 1.0 1213 1.1 1300 0.7 1393 0.6 1493 0.6 1600 0.3 1715 0.2 1838 0.6 1970 1.6 2111 2.4 2263 3.1 2425 3.2 2599 2.6 2786 1.5 2986 1.4 3200 1.9 3430 2.5 3676 2.1 3940 2.1 4222 2.4 4525 3.1 4850 3.0 5198 3.3 5572 3.8 5971 4.6 6400 4.6 6859 4.2 7352 3.3 7879 2.6 8445 2.5 9051 2.0 9701 1.1 10397 -0.7 11143 -2.4 11943 -3.4 12800 -3.7 13719 -4.2 14703 -5.9 15759 -7.0 16890 -7.8 18102 -10.1 19401 -12.2 20794 -12.8 22286 -13.0 __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan


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6th February 2004, 03:27 PM	#2
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	http://www.gti.net/wallin/audio/rsme...5/33-2055.html

6th February 2004, 03:48 PM	#4
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	hmmm, how else would you correct it? if not to physically correct it.. or are you looking for a calibration file?

6th February 2004, 04:03 PM	#7
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	Try this thread on the speaker workshop forums. http://www.speakerworkshop.com/forum...ghlight=332055

8th February 2004, 01:19 AM	#9
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	just keep searching online-ive seen it. its something like 1db at 50hz and 5db at 20hz...only worrysome if ur into subs...also rolls off after 10khz like ron E shows get a wm-60 Cheers

8th February 2004, 12:45 PM	#10
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	A or C? Is that on IEC A or C compensation switch position? slow or fast?

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