Originally Posted by rcohen
I always assumed they were okay up to clipping, but I don't really know.
I would expect the frequency response to be accurate within the range of the calibration file.
For corrected frequencies where the mic is less sensitive, I think the main issue is that you lose SNR.
For example, if the mic is -10db at 15z, the noise will have to get boosted by 10db, along with the rest.
Does Dayton specify this stuff anywhere?
With Cross Spectrum, I see that they will provide the measured noise floor of the mic with a deluxe calibration.
I have not seen Dayton specify anything anywhere. If anyone have the right information, I would love to know it. For example, this list of info is important:
1. SPL range that is accurate (ie, from lowest to highest).
2. Frequency range that is accurate, say from 10, 15 or 20hz up? till where?
Originally Posted by RMK!
Noise floor is what it is ...
. That ^ (bold) is irrelevant but it is probably accurate into the 120's. You should just take some frequency response sweeps from the main LP and see what you have. Point the mic at the ceiling and keep it above reflective chair seat backs (recline them). AFAIR the Frequency Response Sweeps are Track 2 on the Omnimic test disk.
Here is a Omnimic FR measurement taken by desertdome at the 2014 215RT GTG.
I know the noise floor is what it is..
but still would be nice to know exactly what my room's noise floor is
Thanks for the information RMK! So, follow up questions, why point the mic up? I would never have thought of that, for instance.. shouldn't i point it at the front? like how we are seating and looking at the front?
The example sweep you provided, what sort of smoothing is that? 1/12? 1/24? this is another confusing variable, what sort of variables should i set in the software?
And last but not least, what is a good bass decay rate? does anyone have a good example of a graph by omnimic?
Maybe someone ought to create a thread on 'freq resp' charts for their respective rooms so that ppl can compare and learn...