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

TH-18  Flat to 35hz!  (Xoc1's design)
TH-18  Flat to 35hz!  (Xoc1's design)
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 31st July 2018, 05:49 AM   #2771
zettairyouiki is offline zettairyouiki  United States
diyAudio Member
 
Join Date: Apr 2014
A small reduction in efficiency and perhaps a small but likely not very significant worsening in frequency response. Not ideal but it should be alright. You may not be able to tell the difference without measuring it.
  Reply With Quote
Old 31st July 2018, 07:31 AM   #2772
chris661 is offline chris661  United Kingdom
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Quote:
Originally Posted by Augusts View Post
Hi, can you please help me identify the error with Hornresp

Click the image to open in full size.


Click the image to open in full size.


Click the image to open in full size.


as you can see it shows a very weird spl graph when there is more power applied to it and also it indicates insane diaphragm movement, what am I doing wrong?

The driver is 18 sound 18lw1400
This comes up fairly often, so I'd like to address it.

What's happening here is that Hornresp is setting the frequency response so that the driver is receiving exactly the power input shown (unless Xmax is a problem). When the impedance goes up, the voltage input will also go up in order to make sure the power dissipated stays constant (P=V*V/R). Since speakers are conventionally voltage driven, having a drive voltage that varies with impedance will give an extremely non-linear frequency response, as we see here.

Chris
  Reply With Quote
Old 30th August 2018, 08:12 PM   #2773
RMS65 is offline RMS65  Slovenia
diyAudio Member
 
Join Date: Jul 2017
Hi!
I'm preparing to build two TH18.
I am interested in which drivers to use: B & C 18SW115 or 18DS115.
I've already done two TH18 and have built-in Faith pro XL1500 in them.
Faital XL 1500 drivers are no longer on sale, so I'll replace the drivers.
I would install B & C, so I need your expert help to buy.

Thank you!

Jani
  Reply With Quote
Old 31st August 2018, 07:00 PM   #2774
RMS65 is offline RMS65  Slovenia
diyAudio Member
 
Join Date: Jul 2017
Hi!
Some pictures of TH 18 with Faital pro 18XL1500 8ohm.
I run them with the FP14000 Sanway on one channel 2xTH18 at 4ohm.
On the second channel I have 2x Cubo18 Faital 18HP1022 8ohm, also connected so that they work at 4ohm.
[IMG][IMG]
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.
[/IMG][/IMG]
  Reply With Quote
Old 31st August 2018, 07:46 PM   #2775
Rademakers is offline Rademakers  Netherlands
diyAudio Member
 
Join Date: Jan 2005
Location: Rotterdam, NL
T/S-parameter (plus gap depth and winding height)-wise, the B&C 18SW115 is pretty equal to the 18XL1500, while the 18DS115 is quite different.

Nice Cubo's!
__________________
Impossibilities we do immediatly, miracles take slightly longer.
  Reply With Quote
Old 31st August 2018, 07:56 PM   #2776
RMS65 is offline RMS65  Slovenia
diyAudio Member
 
Join Date: Jul 2017
Hi!
Again pictures TH 18.
TH-18  Flat to 35hz!  (Xoc1's design)
  Reply With Quote
Old 31st August 2018, 08:12 PM   #2777
RMS65 is offline RMS65  Slovenia
diyAudio Member
 
Join Date: Jul 2017
Hi!
Thanks, I'll buy 4x B & C 18SW115 8ohm.
  Reply With Quote
Old 20th September 2018, 04:54 PM   #2778
tom28wilson is offline tom28wilson
diyAudio Member
 
Join Date: Sep 2018
Hi everyone!

Firstly these plans look amazing an thank you so much for posting them up. Sorry if this has been asked already but I got tired of scrolling through the 278 pages on here!

I have just embarked on this project, I have bought 2x 18" drivers (18LW2400's) and am about to build the boxes.

I was wondering what mids and tops people have used to go with these and what sounds good? I am preferably going to have a 3 way system and will be using it to play a variety of music but mainly bass heavy stuff (reggae dub, jungle).

Thanks in advance!
  Reply With Quote
Old 20th September 2018, 10:05 PM   #2779
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
If it helps, I've documented the TH18 here - The Subwoofer DIY Page v1.1 - Projects : DIYAUdio Projects - The TH18

The design was done before "advancements" like semi-inductance modeling, so it might be in need of a minor update.
__________________
www.diysubwoofers.org
  Reply With Quote
Old 22nd September 2018, 08:53 AM   #2780
USRFobiwan is offline USRFobiwan
Horn Addict
diyAudio Member
 
USRFobiwan's Avatar
 
Join Date: Oct 2014
Location: Haarlem
TH-18  Flat to 35hz!  (Xoc1's design)
@RMS65, good driver choice, we use them extensively in our xoc builds for hours and hours, but you need a good amp to drive them, Lab Gruppen amps etc category.

@Tom28Wilson I recommend to read the posts it is a great resource and R&D for your build. Also, you can throw any type of music on them they can handle it fine from dub to techno whatever rocks your boat.

The 18S 18SLW2400 is not that powerful duo to its limited xmax of 9.5mm and not that powerful motor, especially now we have Lossy Inductance method in HR. You could drive it max at max 56v (400w) if used with crossover settings

This is how it looks like with crossover settings:
single-at-xmax.PNG

Settings:
single-at-xmax-crossover.PNG

4 cabs more:
4cabs-at-xmax-crossover.PNG

4cabs-at-xmax-crossover.PNG
Attached Images
File Type: png 4cabs-at-xmax.PNG (38.6 KB, 117 views)
__________________
Destroyed some nostalgia
For the love of Horns and glory of pressure waves.
  Reply With Quote

Reply


TH-18  Flat to 35hz!  (Xoc1's design)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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2 18 bass design simpleacoustic Subwoofers 102 20th July 2017 01:38 PM
18 inch labhorn design. mulletdude Subwoofers 30 16th November 2016 02:04 AM
Ciare 18 bass horn design soundhead Subwoofers 6 22nd September 2015 11:32 PM
I want my Avalanche 18 to go flat to 15hz thadman Subwoofers 10 11th November 2006 02:54 AM
Looking for suggestions on a 1300W Dual 18 sub design. mjcohen Subwoofers 5 21st December 2004 07:38 AM


New To Site? Need Help?

All times are GMT. The time now is 06:16 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki