On Sat, 23 Aug 2008 16:03:40 -0700, Mike Scott wrote: >band centers of: 150, 250, 416, 693, 1154, 1921 and 3200 wit
The centers of audio filters in octave, half-octave, one-third octave, and one-sixth octave increments were standardized many years ago by scientists and engineers working in audio and acoustics. Unlike the communications standard for the audio bandwidth of communications systems, these are excellent standards that take into account how humans HEAR sound. We tamper with these standards at our own risk. >It would appear that the bottom equalizer band is beyond useful. >Even with maximum equalization gain the 50 Hz spectrum is still >way down. This tells me that we don't really have an 8-band >equalizer as only 7 bands have utility. The 100 Hz band is >questionable but barely within the zone. 50 Hz and 100 Hz octave bands are VERY important -- they allow equalization to correct for proximity effect in directional microphones, and to reduce the effects of breath pop. The octave bands below 500 Hz contribute little to communications. If allowed to modulate our transmitters, they waste transmitter power. The best designers of sound systems for reverberant spaces know this well -- we carefully roll off the low end of speech systems for big churches beginning somewhere between 200 Hz and 300 Hz. 73, Jim Brown K9YC _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
