Another ECM8000 Question.

[samsagaz]

After read a lot of posts still without lucky to get the ECM8000 working with my PC

All that i have are the following...


EMC8000
SoundBlaster X-FI
UB802
Multimeter

I have prolbems to calibrate the MIC+UB802

can someone help me?

i try with ARTA and Speaker workshop. both need to configure it in diferent ways.

 

[Svein_B]

If, by calibrate you mean exact dB sound pressure level, I guess it is a little complicated. You probably need a reference SPL meter for that.

The following is how I use ARTA, without considering absolute levels:

Start ARTA and run single frequency or pink noise and adjust the soundcard output and your amp to a suitable sound level. The level being either a subjective suitable acoustic level, or measure the AC at the speaker at eg. 1V or 2,83V (=loud!).

Then set up the mic+preamp. Run calibration, or go direct to Imp, and start the the generator/measurement. Adjust mic preamp and Windows recording volume control so you get a level at about 0 dB, or a little below (to avoid A/D overload).

SveinB.

 

[samsagaz]

damn i really would like to get the exact DB preassure, i want to measure and compare like 30 diferents drivers

 

[owdi]

That will be hard to do, even with an SPL meter. Personally I think exact db levels are not nearly as important as relative db levels. So long as you keep the mic a constant distance and voltage, you can compare SPL levels.

Oh yeah, and I couldn't get the calibration to work either. When I pressed the button, there was no sound, so the mic did not record anything.

Dan

 

[samsagaz]

ok.

will try to calibrate it, will check how much is an SPL meter.

 

[Svein_B]

How about an "inverse calibration".
Use a speaker with a known SPL at a given frequency at 2.83V.
If we can use 500Hz for the calibration it should fit directly into the ARTA calibration HMI. Then fine-tune by using time-gated measurements to elliminate room influence.

Might be just as good as a cheap SPL meter ???

SveinB.

 

[ente]

Calibration

Hi samsagaz,

please check the ARTA-compendium in spanish language.

http://www.fesb.hr/~mateljan/arta/AppNotes/ARTA-HB-D2.00 _ES1.pdf

You will find some diy-methods for calibration. Not as reliable as with a 1000$ B&K calibrator but it works.

Regards
Heinrich

 

[samsagaz]

Thanks

 

[samsagaz]

and if i want to get REAL measurement, (dont care too much abt the budget), exist some tools to do that?

 

[ente]

.. if you want real (=calibrated) measurements you need professional calibrated equipment.

A cheap soundcard and a cheap microphone is not the right basis for such kind of requirements.

Here you will find whatever is needed:
http://www.sinusmess.de/e/index.htm

As you mentioned: dont take care about the budget

Regards
Heinrich

 

[samsagaz]

i was checking LMS - Loudspeaker Measurement System,
http://www.linearx.com/products/analyzers/LMS/LMS_01.htm

is that soft good?

i see that sell Mics too

M53 Measurement Microphone 350.00
LMS-4 Loudspeaker Measurement System 1395.00