Jamie, Without regard to what that ad states, the CM500 has an electret element - NOT a dynamic element. I don't know about the Koss SB40, I could not find any reliable data, but they seem to be universally advertized as "computer headset" and since most if not all computer microphones are electret types, I suspect the SB40 is also electret type.
When you get yours, see if it works without bias - if so, it must be a dynamic type, but if it needs bias, it is an electret. 73, Don W3FPR On 2/18/2012 1:10 PM, Jaime P.Ullivarri wrote: > Hello, > I have a Yamaha CM500 and looks exactly as Koss SB40 but this one in EUis > easy to get from Amazon and cheaper. > Both headphones have the same characteristics 120 ohm, 96 dB etc. and both > have Dynamic Mic. > <http://www.shopping.com/xSBS-Koss-Koss-SB-40-Headset-ear-cup-Yamaha-Yamaha-CM500-Headset-with-Built-In-Microphone~PRDLT-21312157-30843141> > > Well I have ordered a Koss SB40 and will see. > 73. > Jaime, EA6NB. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
