![](/boards/images/icons/default/book.gif) Radio Shak SPL meter
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Joined: Jul 2005
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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
paul
Axiom M80, VP180, Qs8, EP500 Epson 3020 Rotel RB-880 Denon AVR-990
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Joined: Apr 2007
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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
Last edited by terzaghi; 12/05/07 08:07 PM.
-David
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Joined: Jan 2002
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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
Alan Lofft, Axiom Resident Expert (Retired)
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Joined: Apr 2007
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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!
-David
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Joined: Dec 2003
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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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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Thanks everyone for the info!
paul
Axiom M80, VP180, Qs8, EP500 Epson 3020 Rotel RB-880 Denon AVR-990
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Joined: Jun 2007
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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
The only reasonable argument for owning a gun is to protect yourself from the police.
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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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 Epson 3020 Rotel RB-880 Denon AVR-990
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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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Joined: Feb 2007
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...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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![](/boards/images/icons/default/book.gif) Re: Radio Shak SPL meter
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My understanding is that both are equal in terms of accuracy, but many prefer the analog meter for HT calibration.
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