John, Excellent information, I don't have an up-to-date copy of 60065. I agree with your conclusions. However, I'm concerned that the headphones
I'm looking at an EN 60065 Group Differences reference to 3.1 within a recent NRTL test report as follows: " NOTE A new method of measurement is described in EN 50332-1, Sound system equipment: Headphones and earphones associated with portable audio equipment - Maximum sound pressure level measurement methodology and limit considerations - Part 1: General method for "one package equipment", and in EN 50332-2, Sound system equipment: Headphones and earphones associated with portable audio equipment - Maximum sound pressure level measurement methodology and limit considerations - Part 2: Guidelines to associate sets with headphones coming from different manufacturers." I'm particularly concerned with the reference to Part 2. The title does point at portable systems and this is not a portable system. However, the authors likely didn't have wireless headphones with their own internal amps and volume control in mind when the standard was written. Thanks again, Carl -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: Friday, March 29, 2013 1:29 PM To: [email protected] Subject: Re: USA Lab for Headphone Sound Pressure Level Test per EN 50332-1 In message <[email protected]>, dated Fri, 29 Mar 2013, Carl Newton <[email protected]> writes: >I'm walking on new ground with this one. I have an automotive audio >system with a wireless connection to portable headphones for use within >the vehicle. Because they are wireless, the headphones have their own >internal speaker amplifiers and volume adjustment. The sound source is >external and not portable, but the headphones appear to qualify as >portable. What's your take on this? It isn't a portable music player within the definition is EN 60065. One criterion is that you can *walk around* with the *player* and headphones on your person. Your player is fixed in the car, and I don't suppose you can walk around in the car! Having said that, your system could be used for listening to music for long periods, so I recommend that you do restrict the maximum sound level to 100 dB SPL. A measurement using a 1 kHz sine wave and an IEC 60318-1 simulator should be sufficient. EN 50332-1 is only a 'method of measurement' standard; the safety requirements are in EN 60065, and your system might not be able to support all of them (such as the automatic warnings). -- OOO - Own Opinions Only. See www.jmwa.demon.co.uk Which Thunderbird will David Miliband pilot? Or will he drive Lady Penelope? John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
