Julf wrote: > And to reproduce that mythical 129 dB peak level mentioned with my 86 > dB/1W sensitivity speakers, I would need 20 kW out of my amps...
The 129 dB peak number that I am familiar with comes from a number of related papers by Fielder and Cohen such as : http://www.zainea.com/Dynamic%20range.htm This number was apparently observed at musical performances that included "Electronic Augmentation" 20596. The fallacy of these observations is that as many of us who have been subjected to loud concerts with "Electronic Augmentation" IOW electric guitars and PA systems for boosting the vocals, the electronics used in concerts often has fairly acute and audible noise problems of its own. If I had a nickel for every concert with "Electronic Augmentation" where hum and noise from guitar amplifiers and hastily erected portable PA systems are clearly audible throughout the concert... So the fallacy of musical performances with high peak levels created electronically but with no reported background noise is a centerpiece of Fielder's landmark ca. 1980s and 1990s work. Its instructive to see where this fallacy led the industry. The first industry response to these alleged new dynamic range requirements was known as HDCD, which was a clever scheme that encoded gain riding controls into what is usually the bits that reproduce the noise floor. We now know that while there was some industry and public acceptance of HDCD, and despite its relatively simple implementation and potential to become a mainstream augmentation to the audio CD, it never gained critical mass and it is now largely consigned to long lost history. FAIL! It was replaced in the marketplace by more elaborate schemes such as DVD-A and SACD but again they failed to gain mainstream acceptance and are now at best niche products. FAIL again! It was apparent to many who did their homework and conducted DBTs and found that so-called high resolution audio was not effective at providing improved sound quality. These findings were first made at the beginning of the new millennium and have never been overcome by tests with comparable scientific rigor. Some are finding that any new music format that hangs its hat on so-called high resolution audio is built on anti-scientific wish fulfillment and will ultimately fail in the marketplace. +-------------------------------------------------------------------+ |Filename: fimage004.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=20596| +-------------------------------------------------------------------+ ------------------------------------------------------------------------ arnyk's Profile: http://forums.slimdevices.com/member.php?userid=64365 View this thread: http://forums.slimdevices.com/showthread.php?t=105717 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
