- Sep 18, 2013
I wonder how it compares to ER3/4? Looks to roll-off fairly early in the highs.OK, this is just a single pair, not a high n overall average, but it's fairly representative. I was hoping to post this last week after my conversation with Zachi, but I didn't get to it.
For fun, I took data from four different ear simulators. They include:
GRAS RA402 - 1/2" mic, high-resolution coupler. 2-branch coupler rated to 20kHz. Suppressed peak at 13.5kHz
GRAS RA404 - 1/4" mic, high-resolution coupler. 2-branch coupler rated to 20kHz. Suppressed peak at 13.5kHz
Zwislocki DB100 - 1/2" mic, 4-branch coupler rated to 10kHz. This particular coupler has a higher than average spike at about 14kHz
GRAS RA0045 - 1/2" mic, 2-branch coupler rated to 10kHz. This is the industry standard for production testing, although the new high-resolution variants may eventually supplant it.
Historically, we've always used the Zwislocki as it's a bit better for recreating the impedance of the human ear (up 10kHz at least), but the increased bandwidth of the new GRAS couplers is compelling.
Maybe it's the scale, but upper mids is pretty emphasized.
In regards to precog's measurments. His insertion depth was too shallow. The insertion depth moves the peak with the clone couplers.