.cal file for Audessey mic

**savior sound** · **04-19-09, 11:27 AM**

I would like to do some full range measurements of my HT room. I know RS SPL meters are not recomended for this. Is there anyway to use the Audessey mic that came with my Onkyo AVR to do this? Would I have to load a .cal file? Does one exist? Can one be made? Also I have a dbx RTAM analyzer mic that I could use if it could be used with better results but again I don't know where to find calabration files for them. Could I use the response specs to create I file? If so, how would I go about this?

**Kal Rubinson** · **04-19-09, 11:33 AM**

The answer is no. You cannot get the curve for the individual mic and you need it for accurate measurements. You can have a mic calibrated or get one with a .cal file.

Kal

**savior sound** · **04-19-09, 02:04 PM**

But I can get the curve for the dbx mic. Can I use it to create a .cal file?

**Kal Rubinson** · **04-19-09, 02:05 PM**

Quote:

savior sound wrote:

But I can get the curve for the dbx mic. Can I use it to create a .cal file?

If it is specific, yes. Generic curves are less useful.

Kal

**brucek** · **04-19-09, 02:41 PM**

Quote:

I have a dbx RTAM analyzer mic that I could use if it could be used with better results but again I don't know where to find calabration files for them.

Steve, I've attached the DBX RTA-M calibration file for REW that I had on file as a generic cal for that mic.

For home use it will be fine, but as Kal says, and we make clear on our download site, that if you are concerned about accuracy beyond home use, then you should have your microphone calibrated. Do not rely on generic calibration files as a perfect standard or for critical measurements.

DBX RTA-M.cal

brucek

**savior sound** · **04-19-09, 10:09 PM**

Thanks brucek. One other question, Do I need to include the mic pre-amp in the soundcard loop back signal chain when a soundcard calibration file is created so that it's (the pre-amp's) response is accounted for somewhere in the calibration process?

**brucek** · **04-19-09, 11:06 PM**

Quote:

Do I need to include the mic pre-amp in the soundcard loop back signal chain when a soundcard calibration file is created so that it's (the pre-amp's) response is accounted for somewhere in the calibration process?

It doesn't hurt to do that. Many people do. Just include the line-in to line-out portion. You don't need to add the mic portion by looping the mic input (which would require a pad), as that sections effect will be quite small.

brucek

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