Measurement difference between RS meter and Outboard Mic

**sportsound** · **05-11-06, 01:21 PM**

I thought I'd try something today. I used REW to measure my sub using the RS meter technique outlined in the REW help files, then I did it again using a Behringer Calibration mic and a studio-grade mic preamp. The constants were the computer, the soundcard (external Creative USB), the measurment postion and the reference level (75db). Using the RS analog meter the C-weighting compensation was ON and with the mic/preamp the compensation was off. When the filters were applied both sets looked pretty close to one another. The top graph is with the mic and preamp and the bottom is with the RS meter.

**brucek** · **05-11-06, 01:55 PM**

Quote:

When the filters were applied both sets looked pretty close to one another

Unfortunately close isn't good enough. This is why we did this test with a professionally calibrated ECM microphone and the analog RS Meter and created a calibration file for the RS Meter that we think makes it quite accurate except for any small differences between individual units.

The calibration file for the RS meter is here

brucek

**sportsound** · **05-11-06, 02:02 PM**

My point exactly.You don't need much compensation if you use a god mic and mic preamp. I have to do the test again with the RS meter cal file loaded. I have to admit, I forgot all about that

I'm waiting here for FedEx to show with my BFD.....
Here's to new toys.

**Sonnie** · **05-11-06, 02:04 PM**

Welcome to the Shack, Philip!

Check out post #2 here for those graph settings too. Post #3 in that thread might help as well.

**sportsound** · **05-11-06, 05:24 PM**

Thanks, I'll do that.
I just got my BFD and the unit doesn't want to store the filter settings from REW. I get a flashing light indicating MIDI traffic, and only 1 filter stores,(#11) and in only one preset (#4). After a few tries I gave up and entered the filter settings manually; it didn't take long at all.
I think I'll return my MIDI interface unless someone here has some suggestions.

**Sonnie** · **05-11-06, 07:03 PM**

I haven't tried the MIDI yet... although I got all the stuff to use it. I know it works. I'm sure someone around here can help you with it.

JohnM can help but he's out of pocket right now and not sure when he'll be able to chime in. Wait before you send it back and see if we can get you some help, unless you don't mind doing it manually. I've done manually for 5+ years and it's somewhat elementary to me now.

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