Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th March 2003, 06:11 PM   #1
diyAudio Member
 
Join Date: Oct 2002
Location: Tucson, AZ
Default Active Absorbers

Dredging up more of Nelson's past. I pulled the following quote from someone on the DIY list (old Bass list):

"Have you heard of active absorbers? Not me, but my colleagues seems to be familiar with this concept, and apparently the idea is 15 years old. It seems like the only logical solution to me.

Nelson Pass seems to have designed the "Shadow" by Phantom Acoustics. (anybody heard these?). Located in Auburn, California."

I searched around a little on the web but didn't turn up anything.

What's the scoop?

Thanks,

Russ in Tucson
  Reply With Quote
Old 7th March 2003, 06:14 PM   #2
diyAudio Member
 
Join Date: Oct 2002
Location: Tucson, AZ
Default Yikes!! Did a new search and found some info.

I'll read some of the reviews but would still like to hear from Nelson on this.

Thanks,

Russ
  Reply With Quote
Old 7th March 2003, 08:17 PM   #3
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
Yea, I recently looked at the patent for it on the patent web site....at least I think this is the one that has to do with that....
Try this link.....
Mark

http://patft.uspto.gov/netacgi/nph-P...AND&d=ptxt&s1='Pass,+Nelson'&OS="Pass,+Nelson"&RS="Pass,+Nelson"

Doesn't appear to work but go here to the quick and type in Pass, Nelson and you can grab it off the list that comes up.

http://patft.uspto.gov/netahtml/search-bool.html
  Reply With Quote
Old 9th March 2003, 05:37 AM   #4
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
http://patft.uspto.gov/netacgi/nph-P...number=4899387
  Reply With Quote
Old 9th March 2003, 05:22 PM   #5
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I have some material and reviews that I'll post on Monday
when I get my ftp working again.
  Reply With Quote
Old 10th March 2003, 07:23 PM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
OK, I got my ftp mojo working again.

Go over to www.passlabs.com/temp to see everything I've stuck up there, and look for the files starting with "Shadow" to see a paper and a review. Some of these
are JPEG, some TIFF, some both.
  Reply With Quote
Old 10th March 2003, 08:09 PM   #7
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Default Mojo

"OK, I got my ftp mojo working again."

Did it make you happy as the man below?
Attached Images
File Type: jpg mojoman.jpg (55.7 KB, 1728 views)
  Reply With Quote
Old 10th March 2003, 08:23 PM   #8
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I think we have the same mojo, but he looks to have
more hair, and it's not gray, either.

Welcome back Fred.
  Reply With Quote
Old 10th March 2003, 09:47 PM   #9
diyAudio Member
 
Join Date: Oct 2002
Location: Tucson, AZ
Thanks Nelson.
  Reply With Quote
Old 11th March 2003, 03:52 AM   #10
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
A few years ago I worked on an 8 screen theatre design in Johnson Creek, WI....2 screens were THX and the HVAC contractor screwed up big time. He guaranteed that the systems would meet NC25, NC30 is required to pass crertification, but they came out more like NC38 or there abouts. The HVAC contractor was faced with the dillemma of making them quiet, fortunately I was not.....I was only the sound system and projection equipment supplier/installer. What he ended up doing was to have two active acoustical noise camncellation systems installed inside the duct work. These active systems, when turned on and calibrated, actually got the systems down to NC28!! THX was skeptical as this had never been done before......not the normal fix for this sort of problem, but they ultimately, after re-testing the NC level, accepted them as part of the system. Everyone lived happily, ever after, the theatre got its THX certification and the HVAC contractor got stuck with the bill, and installation for the devices!
Yes indeed these things work very well!!!
Mark

P.S. The company that made the noise control devices was Digisonics in Middleton, WI.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Active 3-ways with solen active loudspeaker module soundemon Multi-Way 14 19th March 2009 11:17 AM
anybody acoustically treat their room with QRDs or sound absorbers? thadman Multi-Way 2 19th July 2007 07:58 PM
Behringer DCX2496 I want to try active biamping using it as the active xover. georgehifi Digital Line Level 3 15th August 2006 07:46 AM
Active bass absorbers Pan Pass Labs 3 18th November 2003 09:34 PM


New To Site? Need Help?

All times are GMT. The time now is 03:55 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2