Steve, I think the "magic" box does exist for high noise environments, but damned if I have any details. I remember reading of a technology that senses the noise then reproduces the noise in the opposite polarity. This cancels out part of the sound. Sorry I don't have anymore details. Gary Camac "Thorup, John" wrote: > Steve - I would think that you would want to replace and even improve upon > the original sound isolation materials in the Electrovert even if there were > indeed a "magic" box (which there isn't). There are many newer types of > foam insulation such as composites with a lead or other high mass material > backing. Start with the least amount of intrusive sound in the workplace. > FYI the white noise solution, as pointed out, will not work in a high noise > level environment. It is a common technique used in low noise environments > such as large open offices or cubie farms. Low level white noise on a > distributed sound system will mask the sound of your neighbor's phone > conversation or his crappy radio station without actually being apparent. > John Thorup > > -----Original Message----- > > From: Stephen R. Gregory > > Sent: Friday, May 12, 2000 6:27 PM > > To: [log in to unmask] > > Subject: [TN] Noise suppression using "white noise"... > > > > Hi ya'll!! > > > > This post may be a little strange, but I'll ask anyway. We're getting > > ready > > to put a used Electrovert H-500 out on our floor. We currently have a old > > Hollis Poly-clean. When you look at the blowers on a Poly-Clean compared > > to > > the blowers on the H-500, the H-500's blowers look about twice as > > big...and > > the Hollis is kinda' loud...but people don't complain too much when it's > > running...I don't know about the H-500 though. > > > > The sound suppresion foam on the inside of the H-500 needs replacing, it's > > deteriorated quite a bit. But there's a person here that is suggesting > > that > > instead of replacing the foam, look into "white noise" generators. This > > person says that when they were in a machine shop environment, "white > > noise > > generators" were amazing as far as lowering the decible level of the > > machines. > > > > I have to plead ignorance on this subject. Do any of you have any > > knowledge > > about this? Or have any first hand experience with "white noise > > generators"? > > > > Myself, I think we should just replace the sound suppression foam, but > > this > > person swears that "white noise generators" is the way to go (but they > > can't > > tell me where I can find this stuff)...if that is true, where do I go to > > get > > these generators (speakers and certain frequency sources I assume)? Is > > there > > such equipment? I've searched the web, but can't find anybody that sells > > this > > stuff (makes me more confidant that I should just replace the sound > > suppresion foam). > > > > Is this just a bunch of gobble-dee-gook or what? > > > > -Steve Gregory- > > > > ############################################################## > > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > > ############################################################## > > To subscribe/unsubscribe, send a message to [log in to unmask] with > > following text in > > the body: > > To subscribe: SUBSCRIBE TECHNET <your full name> > > To unsubscribe: SIGNOFF TECHNET > > ############################################################## > > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > > additional > > information. > > If you need assistance - contact Keach Sasamori at [log in to unmask] or > > 847-509-9700 ext.5315 > > ############################################################## > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ##############################################################