But R.M.S is sometimes not right either... for example, these minisystems tend to be about 140x2watts. RMS. when infact they are measured in a low independance(about 4) so in accual fact this "140w" is accauly about 70w per channel... plus it has about 10% THD
That's another big con I hate ! What is the use of quoting any specs that involve 10% distortion - commonly seen on some amplifiers & even audio amp ICs - especially the new Class-D types.
DIN stands for Deutsche Industrie Normen and covers all sorts of related specs - even the size of enclosures.
I believe the DIN spec someone asked about is the DIN method of measuring peak power - somewhat more ethical than the meaningless PMPO.
Quote (from Peak Power Meter specs) :
There are several Europena PPM specifications, but no one universal standard; although the German DIN specification 45406 functions somewhat as a de facto standard. An interesting aspect of PPM design is that rather than respond instantaneously to peaks, they require a finite integration time so that only peaks wide enough to be audible are displayed. DIN 45406 translates this into a response that is 1 dB down from steady-state for a 10 ms tone burst, and 4 dB down for a 3 ms tone burst (this is consistent with the other commonly seen specification of 2 dB down for a 5 ms burst -- both requirements are satisfied by an attack time constant of 1.7 ms (BBC requirement is 2.5 ms). The specified decay rate of 1.5 seconds to a -20 dB level can be met with a 650 ms time constant."
Chris Muriel.