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Great so far
Still need to invest/test them with a decent amp. Seen a lot of reviews saying more power from an amp can enhance the sound/separation, but they still push out a good sound with modest power as well.
Would recommend to a friend.
This is the $350 question which is the cost of the EN 60-268-7 standard from the ANSI web store (see end of post) and the standard used with 6XX phones - using the 500 mW "Long-term input power" for the 6XX's and playing with
numbers I get: 500mW 1 kHz = 124.76 dB SPL or 12.25 Vrms-sine or 34.61 Vp-p sine into 300 Ohms ( = 37.52 Watts into 4 Ohms ) - based on "103 dB SPL = 1 Vrms ( 2.83 Vp-p ) sine at 1 kHz" - so a 40 W / channel amp would suffice. But we want maybe 10 dB of headroom for those peaks - new numbers = 38.73 V rms sine ( 375 Watts into 4 Ohms ) or 109.45 Vp-p sine for cymbal crashes etc. - Say What?? I need a copy of the ANSI standard badly - but paying for a standard is like paying to learn the speed limit on a road - Insane.
DIN EN 60268-7: 2011 DE
Electroacoustic Equipment - Part 7: Headphones And Earphones (IEC 60268-7: 2010); German Version EN 60268-7: 2011 (Foreign Standard)
This International Standard, part of IEC 60268, applies to headphones, headset-headsets, earphones and headset-headset headsets that are used on or in the human ear. It also applies to devices that are part of a headphone system such as preamplifiers, passive circuits and power supply devices. * This international standard IEC 60268-7 applies to headphones, headphone sets, earphones and earphone-speaking sets that use be used on or in the human ear. Part 7 of the standard also relates to devices that are part of a headphone system such as preamplifiers, passive circuits and power supply devices. This standard specifies the properties and the associated measuring methods that should be specified by the manufacturer in data sheets. It includes a classification of the different types of earphones, mainly related to the way the transducer is acoustically coupled to the ear, and a coding scheme that can also be used for identification. It is intended to replace DIN EN 60268-7: 1996-10. The UK 742.6 "Microphones and Headphones" of the DKE German Commission for Electrical, Electronic and Information Technologies of DIN and VDE is responsible.