Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Vintage article "A Tuned Pipe for Bass Enhancement" by Raymond Bates
Vintage article "A Tuned Pipe for Bass Enhancement" by Raymond Bates
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 16th September 2020, 03:45 AM   #1
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
Default Vintage article "A Tuned Pipe for Bass Enhancement" by Raymond Bates

from the 1955 Audio Anthology reprint of the original article. (and a very clean looking issue)

Norman C. Fulmer had already published an article (and patent) for an enclosure with tapered terminus.

This article borrows part of Karlson's 15 aperture for the tapered slot exit.

Subjectively the builder seemed pleased

It appears to be tuned about center of the EV SP12B speaker's resonance.

I wonder how its response would really look.
Attached Images
File Type: jpg BATES_1_1280x.jpg (607.2 KB, 179 views)
File Type: jpg BATES_2_1280x.jpg (509.6 KB, 176 views)
File Type: jpg BATES_3_1280x.jpg (372.1 KB, 177 views)
File Type: jpg BATES DETAIL 1.jpg (342.7 KB, 176 views)
File Type: jpg BATES DETAIL 2.jpg (260.8 KB, 175 views)
  Reply With Quote
Old 16th September 2020, 11:34 AM   #2
carlthess40 is offline carlthess40  United States
diyAudio Member
 
Join Date: Oct 2017
Location: Lake Mary Florida
Looks simple to build
  Reply With Quote
Old 16th September 2020, 11:45 AM   #3
bansuri is offline bansuri  Italy
diyAudio Member
 
Join Date: Aug 2008
Location: Dolceacqua
That looks to me like a transmission line, around 60Hz fundamental resonance. The form of the opening won't have much influence.
A high Qts driver is needed.
  Reply With Quote
Old 16th September 2020, 12:53 PM   #4
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
The much later SP12 ("C") in this case was spec-ed at Qts = 0.67. My Fane 12-250TC when new had qts ~0.8 and fs ~67Hz.

https://community.klipsch.com/upload...1925770331.gif
  Reply With Quote
Old 16th September 2020, 01:14 PM   #5
carlthess40 is offline carlthess40  United States
diyAudio Member
 
Join Date: Oct 2017
Location: Lake Mary Florida
What modern drivers would work? Is this a full range can or just a low or band pass speaker cab ?
  Reply With Quote
Old 16th September 2020, 06:31 PM   #6
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
since its rear load and direct radiator, there would be no more effect upon the highs than a reflex box. I don't have access to hornresp - maybe GM oe aomw other handy soul would do a sim with a couple of the following

Fane12-250TC, Eminence 12LTA, Celestion K12H-100TC, Celestion K12H-200TC Eminence Beta 12CX, Eminence B102, Nirvana 10 inch, etc.

There's less than 2 cubic foot airspace - a Karlson K12 has about 1.3 cubic foot rear chamber - both appear to be tuned in the low 60's.

Snugged into a corner, the Bates pipe would take up very little space - and might even work well.

(my Karlson K12, depending upon driver, can do some things better than my Klipschorn !- do not be afraid of Karlson or Karlsonator when loaded with appropriate drivers - - run for the hills if a K12 is loaded with a GRS BOFU knockoff. )
  Reply With Quote
Old 16th September 2020, 08:01 PM   #7
EddieT is offline EddieT  United States
diyAudio Member
 
Join Date: Apr 2014
Location: Mountains of WNC
The use of the K aperture is intriguing.
  Reply With Quote
Old 16th September 2020, 10:04 PM   #8
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
blurry black and white images don't auto colorize real well.

Here it is from the article. There was once one at Ebay. I'm intrigued by it's small size when poked in a corner.
Attached Images
File Type: png Bates double oolor web.png (203.1 KB, 51 views)
  Reply With Quote
Old 16th September 2020, 10:40 PM   #9
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
here's what looks to be a Fulmer - Bates mashup with generous slot area

(Do we have a BLH here?)
Attached Images
File Type: jpeg BATES Fulmer Pipe.jpeg (93.5 KB, 40 views)
  Reply With Quote
Old 17th September 2020, 03:48 AM   #10
norman bates is offline norman bates  United States
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
isn't there a subwoofer thread, maybe called keystone that is playing with this ?
  Reply With Quote

Reply


Vintage article "A Tuned Pipe for Bass Enhancement" by Raymond BatesHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Vintage article - "A No Cost Acoustic Cabinet for Transistor Portables" freddi Full Range 10 12th September 2020 11:01 PM
Anyone own KEF Reference 104/2 "Raymond Cooke Special Editions?" glasswolf Multi-Way 0 4th October 2010 02:14 PM
HTPC "Enhancement" usuckadapp Digital Source 2 25th December 2007 01:19 AM
15" pipe for a bass cabinet I_Forgot Subwoofers 1 9th May 2005 02:48 AM
Clock radio speaker enhancement "project" ukram Everything Else 0 20th September 2004 09:46 PM


New To Site? Need Help?

All times are GMT. The time now is 03:12 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki