Go Back   Home > Forums > Loudspeakers > Full Range

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 3rd May 2011, 02:28 PM   #1
dbaudio is offline dbaudio  United States
diyAudio Member
 
Join Date: May 2003
Location: Cranberry Twp., Pa. 16066
Default TL_A&B

Hey yall, I just finished TL B, except wood finish, sorry to say things did not come out as expected.
Started with idea that an 8" fr driver would supply enough bass extension, so looking at whats out there - Nirvana 8, Fostex 8, new Dayton ps220-8. Bought the Dayton and got no less than F3=150 hz. TL A is a 64" staight line, 48 in2, 1.7 cf, 22oz polyester. TL B is an 9" offset straight line with the same dimensions, which I thought would improve the situation... still F3=150hz.
Parts Express, Dayton ps220-8 specs using WT I = Fs 44, Qt .37, Qe .39,
Qm 5.3, Vas 2.2 cf, Sd 220cm2, re 6.3, le .65, 96db, BL 7.2 Tm.
Any Suggestions?
PS: I have tried and tried to convert bmps, to show a couple attachments,
couldn't figure it out- too big?
  Reply With Quote
Old 3rd May 2011, 02:47 PM   #2
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
First suggestion-- convert those bmps to jpgs and you will have a lot better chance of loading.

Second -- Those three drivers require vastly different boxes. You do not mention the size of the open end. I'm guessing that it is the same area as the rest of the pipe and, yes, F3=150 sounds about right. Also 9" offset is way too little to have any real effect. But that effect has nothing to do with the tuning frequency, only reducing unwanted harmonics. you need to do some modeling if you want to get it right. the preferred software is HERE. Read the documentation there to get a handle on what the physics are with quarter-wave pipes.

Bob
  Reply With Quote
Old 3rd May 2011, 02:51 PM   #3
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
'BIB' pipe horn for low, medium Qt drivers. That, or add a BSC ckt. to the existing ones to trade some efficiency for a proper tonal balance if its size and/or lack of suitable placement makes it not an option.

Dunno, when I convert them to 'gif I've so far been able to post them.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 3rd May 2011, 03:01 PM   #4
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by Bob Brines View Post
First suggestion-- convert those bmps to jpgs and you will have a lot better chance of loading.
FWIW, when I was having problems with this issue, Dave p10 posted that .gifs was the best choice for at least these forums and maybe on-line period [I can't remember now], but it has so far worked for me.

Not sure if it's typical, but the one 369 kb bmp example I've kept converted to a somewhat larger, 'whiter' displayed 832 kb jpeg/42 kb gif.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 3rd May 2011, 05:11 PM   #5
diyAudio Member
 
Join Date: Jan 2007
Hi guys,

GIF is best for graphs because it compresses large blocks of repeating pixels. But it can't handle many colors simultaneously. It's limited to an "indexed palette." JPG is good for photos but sometimes it can make a graph with lots of solid white look a little gray or pinkish, in which case GIF is better.
  Reply With Quote
Old 3rd May 2011, 07:00 PM   #6
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Play with this free program. For jpg's, set the max file size to 80k. Even at 800x600, the pictures will look fine on the internet and they will load in a flash.

Bob
  Reply With Quote
Old 4th May 2011, 01:16 AM   #7
dbaudio is offline dbaudio  United States
diyAudio Member
 
Join Date: May 2003
Location: Cranberry Twp., Pa. 16066
Thanks Bob Brines for your info, the terminus for both are 6"x7". I read somewhere that
the chambered line has the lowest F3. I have read up on the Martin site, also the Augspurger tables. I leaned more toward the latter which calc'd F3 of ~70 but with a 3.3cf line. This would mean a box 2x my size (24" deep),
so goes the saying " T-Lines require a large box for bass extension ". Looks like with hind site I end up using a subwoofer for bass extension.
  Reply With Quote
Old 5th May 2011, 01:15 PM   #8
dbaudio is offline dbaudio  United States
diyAudio Member
 
Join Date: May 2003
Location: Cranberry Twp., Pa. 16066
Default TL A&B pics

Finally was able to shrink these docs using Zip.
Gives you better idea of my TL a&b builds. Also note, although probably not as clean of sound; the linear bass extension for the Vented Box shown would work too.
Attached Files
File Type: zip TLB.zip (531.0 KB, 85 views)
File Type: zip TLoffset2.zip (13.3 KB, 51 views)
  Reply With Quote
Old 5th May 2011, 02:05 PM   #9
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Your driver in my MLTL:

40"x9.5"x10.5"
Driver 10" down
Port 4"x6" 35" down.

F3~40Hz, F10~30Hz

Bob
Attached Images
File Type: gif Dayton PS200-8 in FT-2000.gif (6.8 KB, 304 views)
  Reply With Quote
Old 5th May 2011, 02:12 PM   #10
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

Quote:
Originally Posted by rjbond3rd View Post
GIF is best for graphs........
Thanks! Yeah, found my notes, this is basically what Dave told me.

Quote:
Originally Posted by Bob Brines View Post
Play with this..........
Thanks for the reminder, I've had this program for ages, but keep forgetting about it.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  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
Modify & build out (2) Western Electric 300B / 2A3 Hammond monoblock amps & UTC LS-5 quality sound Tubes / Valves 0 9th May 2009 03:59 PM
Krell KSA 80 bias & dc offset check & adjust procedure Clouseaupte Solid State 3 9th August 2007 09:39 AM
DIY-AMP <ZAS> Low THD & IM high bandwith murphy Solid State 18 30th December 2005 10:28 AM


New To Site? Need Help?

All times are GMT. The time now is 07:38 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