Help the Ijit -- Build a "Bose Cannon" knockoff - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 23rd July 2013, 02:59 AM   #21
diyAudio Member
 
Soldermizer's Avatar
 
Join Date: Feb 2012
Location: Tamper, FL, USA
I've spent many hours reading up on the sonotube and transmission lines in general. Like most things DIY and hi-fi, there are many variants on how to do it "right." A given speaker sounds fine to person A, sounds like crap to B. Speaking of just the simplest tube speakers (that is, those that are only the subwoofer stuck in the end of a straight pipe, possibly with a floor base), I have seen few, maybe none that used the Bose Cannon formula: driver 1/4 of the way in, or two tubes one L = wavelength/4 and the short one L/3, depending on how you look at it. I think I understand the basic idea behind the simple 1/4 wave tube, but have yet to grasp what the "short" tube does for you.

I am still sourcing materials. I have found a local "hose" supplier (Tampa) that will sell in small quantities. Once woofer is in hand, I will visit store and see what kinds of hose it jams into best. I will probably go for the thickest but still flexible tubing. Of course it all comes down to cost; if not a huge difference I will try the hose (16' total), other wise it's the Sonotube (12' and 4') or equivalent.
  Reply With Quote
Old 23rd July 2013, 03:47 AM   #22
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
OK, then you know that a 1/4 WL resonator has a deep notch at its 3rd harmonic [approximately 2 octaves above tuning] and the short pipe taps in at this point to fill in, flatten its response for a bit more usable gain BW without having to resort to a larger pipe horn.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 23rd July 2013, 06:51 PM   #23
diyAudio Member
 
Soldermizer's Avatar
 
Join Date: Feb 2012
Location: Tamper, FL, USA
Makes sense. I will just do basic TL and see if I am satisfied. Main goal is to frighten the cats and pi$$ off the neighborhood anyway.

Last edited by Soldermizer; 23rd July 2013 at 06:53 PM. Reason: creAtive swearing to foil censor
  Reply With Quote
Old 23rd July 2013, 07:07 PM   #24
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
At a time when 'subs' typically only existed as basement IBs in extreme horn systems to handle the few RTR tapes with < ~42 Hz output, my 16 ft BP-TL 'sonic cannon' occasionally got me a 'disturbing the peace' visit and it only had a high Qts 8", so I often wonder how some folks can play action movies at > THX reference without incurring a similar response because for sure that 8" was loud, but not >115 dB/listening position loud and didn't get within 1-2 octaves of their bottom end simply because there was no signal below ~27 Hz.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 23rd July 2013, 10:22 PM   #25
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by GM View Post
At a time when 'subs' typically only existed as basement IBs in extreme horn systems to handle the few RTR tapes with < ~42 Hz output, my 16 ft BP-TL 'sonic cannon' occasionally got me a 'disturbing the peace' visit and it only had a high Qts 8", so I often wonder how some folks can play action movies at > THX reference without incurring a similar response because for sure that 8" was loud, but not >115 dB/listening position loud and didn't get within 1-2 octaves of their bottom end simply because there was no signal below ~27 Hz.

GM
Car subs broadcasting over several square city blocks have raised the threshold considerably.

It is interesting to think that a "performance" automobile sound system may have as much power as the Hanley sound system (using similar speakers as your avatar) that provided sound for nearly half a million people at Woodstock '69.
  Reply With Quote
Old 23rd July 2013, 11:39 PM   #26
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
Tinnitus is horrible, I have it, so be careful!
__________________
www.flyingmole.co.uk For World Wide support for Flying Mole, Class D, Refurbishment and Repairs. www.jonsnell.co.uk
  Reply With Quote
Old 25th July 2013, 01:13 AM   #27
diyAudio Member
 
Soldermizer's Avatar
 
Join Date: Feb 2012
Location: Tamper, FL, USA
Default From Hearts of Space host ....

Kind of relevant...The Diggeridoo may be the world's oldest musical instrument. IT is in essence a prehistoric transmission line.
  Reply With Quote
Old 25th July 2013, 01:57 AM   #28
diyAudio Member
 
Soldermizer's Avatar
 
Join Date: Feb 2012
Location: Tamper, FL, USA
Default More on hose for the enclosure.

Hardly original, but it seems fairly unexplored territory using pipe, especially flexible material, in making a speaker system. Maybe there is some kind of losses in flexing of the "box" or maybe it is just a visual horror.

Lots of men are justifiably proud of building stuff out of wood. For me, even the termites eating the dead guts of a eucalyptus (future diggeridoo) will make a better product than I could.

And my time is a piece of wax, fallin' on a termite
That's chokin on the splinters
-- Beck, "Loser"


Maybe I can advance the art of making stuff that makes sound that requires no cellulose.

Why not a full range driver in a tube, sized to the right Fs? If tube is flexible then shape tube to taste and perhaps glue in position.


But what do you expect? I have sank so far into the cessspool of audio dereliction that I often try to make my purchases of old Bose 901s coincide with my travels, so I can pick up and save on shipping. In my own defense, I once did that for quality (Conrad Johnson amp) but that was years ago before the dark side won me over

Last edited by Soldermizer; 25th July 2013 at 02:07 AM. Reason: now with 20% more wisea$$
  Reply With Quote
Old 25th July 2013, 10:54 AM   #29
diyAudio Member
 
Join Date: Apr 2011
Soldermizer (-: I read your iNuke posts in another thread along with all of the ummm... "subtle" "hall monitor" tweaking. Much, much, much humor You sir are part of a dying breed. I will come out and say it. Real men. .......who are not scared. Welcome to Amerika my new friend and indeed and sadly, I probably will see you in camp. We will no doubt be building something incorrectly, from parts available. Something needed desperately, while being watched helplessly.

On topic that sounds to me like a very viable "30 minute" extremely powerful sub. Gorilla tape, some kind of huge tube and Hornresp to model and a saw to tune, start long and too low test with sweep to verify audibly and cut till you have the half octave you are looking for. Bozo already did this humongous "flute" sub as you know and hell yes it works.

Last edited by peteleoni; 25th July 2013 at 10:57 AM.
  Reply With Quote
Old 25th July 2013, 04:52 PM   #30
diyAudio Member
 
Soldermizer's Avatar
 
Join Date: Feb 2012
Location: Tamper, FL, USA
Link to the flute sub? I dinna recall it.

Aww, what the f$$$, as long as I'm going off the deep end, why not: the HOSE 901, use the drivers from the creature from The Mountain, but instead each is in its own adjustable in goose neck lamp style, hose transmission line.

Last edited by Soldermizer; 25th July 2013 at 04:57 PM.
  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
Bose vs DIY set up for "invisible" second system cr0wl3y Multi-Way 18 7th September 2010 06:21 PM
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 07:42 PM
Acura RSX with Acura/Bose "Premium" Sound System kevinkr Car Audio 15 30th November 2009 03:32 PM
Bose Cannon David R. Carlso Subwoofers 10 5th January 2006 05:44 PM


New To Site? Need Help?

All times are GMT. The time now is 08:07 AM.


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