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#186743 - 12/05/07 02:37 PM Radio Shak SPL meter
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
I own one of these meters and have lost the instructions. Can any body tell me what the weigthing switch does / means (A and C)? I usually keep it a C, but I don't understand, isn't volume scale in dB. How can it change? And why isn't here a weighting B?

Thanks

Paul
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paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#186749 - 12/05/07 03:05 PM Re: Radio Shak SPL meter [Re: Worfzara]
Happy Birthday terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4848
Loc: Tulsa, Oklahoma
I just bought one of these today (the digital ones) and I was looking through the manual.

I don't remember the exact descriptions of the two, but it said that A was for 'natural environment frequencies' or something along those lines.

It said to use c for the calibration of PA's or stereo equipment.

Edit: here is a link to the manual

http://rsk.imageg.net/graphics/uc/rsk/Support/ProductManuals/3302055_PM_EN.pdf


Edited by terzaghi (12/05/07 03:07 PM)
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#186759 - 12/05/07 04:49 PM Re: Radio Shak SPL meter [Re: Worfzara]
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3186
Loc: Toronto/New York/Dwight
Hi Worfzara,

Always use the "C" weighting scale for all measurements of reproduced music levels at home, live music SPL measurements and outdoor measurements of any kind of industrial sound levels or live concerts. The "C" weighting takes into account bass frequencies, whereas the "A" weighting scale suppresses the importance of deep bass.

I can't recall if there is a "B" weighting or what it represents. I've never come across a reference to it in all my years writing about and reviewing audio components and loudspeakers.

Regards,

Alan
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Alan Lofft,
Axiom Resident Expert

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#186763 - 12/05/07 05:05 PM Re: Radio Shak SPL meter [Re: alan]
Happy Birthday terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4848
Loc: Tulsa, Oklahoma
According to the manual the A rating responds to
'mainly frequencies in the 500-to-10,000 Hz range only'

So I imagine it would not be very good to calibrate a stereo system!
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#186765 - 12/05/07 05:17 PM Re: Radio Shak SPL meter [Re: terzaghi]
BrenR Offline
connoisseur

Registered: 12/10/03
Posts: 3602
Loc: Winnipeg MB Canada
C-weighting takes in to consideration the "frequency response" of the human ear.

And no, Alan.. they don't include B-weighted, D-weighted or any of the ISO weightings/curves.

Bren R.

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#186816 - 12/06/07 09:56 AM Re: Radio Shak SPL meter [Re: BrenR]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
Thanks everyone for the info!
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paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#186825 - 12/06/07 10:42 AM Re: Radio Shak SPL meter [Re: Worfzara]
Da_Gimp_Pimp Offline
connoisseur

Registered: 06/23/07
Posts: 4013
Loc: Sitting down somewhere
Radio Shack (Circuit City) here in Canada only sells one SPL meter and it is digital. I have talked to a home theater setup professional and he said that the digital meters are far less accurate than the analog meters, and he doesn't know where to find an analog one around here. I can find an analog one on the Internet easily, but it will be more expensive. If his advice is true, I will definitely go the analog route.

Has anyone else heard anything, or experienced the difference between the digital and analog SPL meters.

Thanks
_________________________
Does a dyslexic atheist not believe in dog?

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#186826 - 12/06/07 10:59 AM Re: Radio Shak SPL meter [Re: Da_Gimp_Pimp]
Worfzara Offline
aficionado

Registered: 07/25/05
Posts: 709
Loc: London area, Ont, Canada
The meter I have is my dad's, and he bought it in early 80's. It is analog. Thanks for posting this, cuz I was gonna give it back to him and buy a digital one. Maybe I will just keep it.

Paul
_________________________
paul

Axiom M80, VP180, Qs8, EP500
Panasonic PT-AU900
AudioTrak AT-6100
Denon AVR-990

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#186835 - 12/06/07 11:55 AM Re: Radio Shak SPL meter [Re: Da_Gimp_Pimp]
rye_guy79 Offline
frequent flier

Registered: 02/02/07
Posts: 18
Loc: Fort McMurray, Alberta
 Originally Posted By: wheelz999
...doesn't know where to find an analog one around here. I can find an analog one on the Internet easily, but it will be more expensive. If his advice is true, I will definitely go the analog route.


I bought one like this (not this seller) on ebay last year, I think it was about $30 to get it to my doorstep. It looks very similar to the old RS analog meters, but I'm not sure if it's the same internally or just a knock off.

Anyways, it has worked well enough to let me calibrate my speakers to each other. The whole thing could be off 10db, but at least all the speakers match! Someday I'll bring it out to site and see how it matches up against the meter they use down in the OH&S department.

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#186858 - 12/06/07 01:19 PM Re: Radio Shak SPL meter [Re: rye_guy79]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10848
Loc: Central NH
My understanding is that both are equal in terms of accuracy, but many prefer the analog meter for HT calibration.
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#186884 - 12/06/07 02:48 PM Re: Radio Shak SPL meter [Re: MarkSJohnson]
skyhawk669 Offline
devotee

Registered: 01/23/06
Posts: 436
Loc: Austin, TX
I would think it would be easier to read a fluctuating needle than it is on a digital display.

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#186964 - 12/07/07 12:11 AM Re: Radio Shak SPL meter [Re: Da_Gimp_Pimp]
HAY Offline
aficionado

Registered: 12/31/03
Posts: 720
Loc: Burlington, Ontario
 Originally Posted By: wheelz999
Radio Shack (Circuit City) here in Canada only sells one SPL meter and it is digital. I have talked to a home theater setup professional and he said that the digital meters are far less accurate than the analog meters, and he doesn't know where to find an analog one around here. I can find an analog one on the Internet easily, but it will be more expensive. If his advice is true, I will definitely go the analog route.

Has anyone else heard anything, or experienced the difference between the digital and analog SPL meters.

Thanks


Hey Wheelz, call a music/instrument store as they're a good place to start. I know the one in my neighbourhood (Burlington) has some that you can rent or buy. I ended up getting the digital one as at the time it was all they had and it was cheaper.

You should be able to find a place in Toronto that has some and can ship to Peterborough.
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M60 VP150 QS8
Open for Auditions but please don't drool on the High Gloss

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#186997 - 12/07/07 11:20 AM Re: Radio Shak SPL meter [Re: HAY]
Da_Gimp_Pimp Offline
connoisseur

Registered: 06/23/07
Posts: 4013
Loc: Sitting down somewhere
Thanks for your help, it's greatly appreciated. I was trying to think of other stores that might have other meters but I couldn't come up with anything. A music/instrument store makes a lot of sense.

Thanks again
_________________________
Does a dyslexic atheist not believe in dog?

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#187382 - 12/10/07 08:49 PM Re: Radio Shak SPL meter [Re: Da_Gimp_Pimp]
cava Offline
enthusiast

Registered: 08/23/06
Posts: 33
According to my professor for noise and vibration control class the A-weighted scale closely models the human response to sound below 55 dB and the C-weighted scale models the human response for sound above 85 dB. The human response is a function of not only frequency but also level.

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