Rat Shack SPL meters

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drphoto

Rat Shack SPL meters
« on: 24 Jul 2010, 10:27 pm »
I feel like I'm having some problems getting my subs dialed in, so I figure I need to run some test tones and take some measurements. (Right??)

Anyway, I think I've read somewhere that the old analog Rat Shack meter is better than the current digital version.

Is this right? (and why)

If so....anyone got one for sale?

thanks

jqp

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Re: Rat Shack SPL meters
« Reply #1 on: 24 Jul 2010, 11:35 pm »
IIRC the key is to get the calibration chart for either version - sometimes you can get a test disc with charts included

geezer

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Re: Rat Shack SPL meters
« Reply #2 on: 24 Jul 2010, 11:55 pm »
As far as I know, it's mostly a personal preference. I prefer the analog version, just as I prefer analog watches to digital, because I get a better feel for the magnitudes of changes.

WGH

Re: Rat Shack SPL meters
« Reply #3 on: 25 Jul 2010, 12:12 am »
Here is a chart for the analog meter:
http://www.subwoofer-builder.com/SPL-corrections.htm

I have used the free Room EQ Wizard from Home Theater Shack (registration required)
http://www.hometheatershack.com/

REW can generate test tones and graph your room response using a Radio shack meter and the sound meter correction table plug-in.

Wayne

DanTheMan

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Re: Rat Shack SPL meters
« Reply #4 on: 25 Jul 2010, 12:26 am »
I'll double the recommendation of going to HTS to get the calibration.  My RS meter is not too far off my professionally calibrated mic using what they have.  It's not as good, but is sure is cheap--free.  And it should do for sub setting and general level setting.  Generally the older one is considered better and stock measures more flat.  Calibrated, they'd be the same.

Dan

Phil A

Re: Rat Shack SPL meters
« Reply #5 on: 25 Jul 2010, 12:45 am »
rivesaudio.com makes a test disc to compensate for the analog Radio Shack meter as well.  I think it is $21.

Phil A

Re: Rat Shack SPL meters
« Reply #6 on: 25 Jul 2010, 12:47 am »

Steve

Re: Rat Shack SPL meters
« Reply #7 on: 25 Jul 2010, 01:07 am »
I feel like I'm having some problems getting my subs dialed in, so I figure I need to run some test tones and take some measurements. (Right??)

Anyway, I think I've read somewhere that the old analog Rat Shack meter is better than the current digital version.

Is this right? (and why)

If so....anyone got one for sale?

thanks

WGH provided good information. The RS meters are down as the frequency decreases. So be careful not to overbass your room because of the meter's inaccuracy at the lower frequencies.

Cheers.
« Last Edit: 4 Aug 2010, 01:57 pm by Steve »

WGH

Re: Rat Shack SPL meters
« Reply #8 on: 25 Jul 2010, 01:47 am »
You may have your sub at a room mode which is causing problems. As a test, download the Harmon Room Mode Calculator (uses Excel or compatible software):
http://www.wghwoodworking.com/audio/RoomModeCalculator.zip

Enter your room dimensions and program will graphically show the location of your rooms standing waves.
Based on the graph's measurements, move your sub to a null - either length, width or both.
Just something to play with until you get a meter.

Wayne


drphoto

Re: Rat Shack SPL meters
« Reply #9 on: 25 Jul 2010, 07:49 pm »
Thanks for all the help. I actually don't think I'm having nodal issues. (could be wrong) I'm running a pair of OB servos plus a bipolar Mirage in a huge space compared to the typical listening room.

I'm just not sure I've got all the phase angles, crossover points and levels dialed in optimally. I find I'm constantly fiddling w/ the setting.

All in all, it sounds very good for the most part.

Also, I sometimes mix sound for bands at live shows, and a meter would help me dial in their rigs.


CSI

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Re: Rat Shack SPL meters
« Reply #10 on: 25 Jul 2010, 10:31 pm »
Radio Shack still makes the meter in analog as well as digital format. But for precision work, you do need to calibrate it.