comp.dsp - join
Digital Signal Processing using computers.
Low activity, 3832 subscribers, Usenet

rec.audio.pro - join
Professional audio recording and studio engineering.
Low activity, 4439 subscribers, Usenet

alt.audio.pro.live-sound - join
Discussion of live sound reinforcement
Low activity, 812 subscribers, Usenet

rec.audio.tech - join
Theoretical, factual, and DIY topics in home audio.
Low activity, 1073 subscribers, Usenet

rec.audio.high-end - join
High-end audio systems. (Moderated)
Low activity, 903 subscribers, Usenet

sci.archaeology.mesoamerican - join
The field of mesoamerican archaeology.
Low activity, 121 subscribers, Usenet

sci.engr.radar+sonar - join
Radar & sonar systems.
Low activity, 116 subscribers, Usenet

sci.med.physics - join
Issues of physics in medical testing/care.
Low activity, 130 subscribers, Usenet

alt.sci.physics.new-theories - join
Scientific theories you won't find in journals.
Low activity, 559 subscribers, Usenet

alt.sci.physics - join
Low activity, 495 subscribers, Usenet