This is the 60318-4 occluded ear simulator I use for IEM measurements, with the conically-concaved proprietary external ear adapter attached. A pair of these are encapsulated in my dummy head, EURI, as well (level difference less than 1 dB from 20 to 20,000 Hz). Last time I got a quote from BSWA USA in April 2011, the price of this simulator was $3150 each.
Above is the calibration chart I received from the manufacturer, and the simulator has an acoustic input impedance effectively matching that of the human ear canal.
Very Nice...
ReplyDeleteJim
Is this different from the GRAS RA0045 and B&K 4157? Has IEC 60318 been revised from 60711?
ReplyDeleteThey are all equal, at least with the acoustic impedance, due to dual-ring helmholtz resonators implemented. And yes, it is a revised version of the IEC 60711 standard.
DeleteWhat are the differences between the standards? I can't seem to find a listing...
Deletechanged some of terms & added measurement circumstances, as far as I know. And the diagram looks nicer. Also,
Delete- extension of the usable frequency range to 100 Hz - 16 000 Hz;
- addition of values of maximum permitted expanded uncertainties to all tolerances.
I have a question: if I measured a earphone with a 2cc coupler and applied a RECD compensation curve, would it give me a rough idea of how "flat" the response is compared to a real ear's response?
ReplyDeleteA 2cc has its own acoustic input impedance characteristic, and the degree of resulting SPL deviation might vary depending on the amount of acoustic output impedance a transducer has.
DeleteWouldn't that occur with every type of coupler then? I guess I should say that the RECD compensation would be specific to the 2cc...
DeleteMy 2 cents. better to be done than said: Upon the compensation, you will notice the corrected response look a lot different than expected, and the same compensation technique is not universally applicable to all IEMs.
DeleteIs there anyway that this or anything other DIY coupler would be up for buying? Thanks.
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