2x18" ... What should I do with them? - 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 10th November 2008, 08:07 PM   #1
KI is offline KI  Norway
diyAudio Member
 
Join Date: Apr 2008
Default 2x18" ... What should I do with them?

Hi!

Now, the winter is upon me and I need to do some fun project to keep me entertained.

This summer, I picked up 2 x 18" PA drivers at an extremely low cost, so I just thought; why not?

The plan is using them as subs... (duh). I've read from the manufacturer that they will do -3 @ 33hz in a 200liter enclosure with 2* 15cm ø 35cm (length) tubes.

Details about the drivers can be found HERE.

My question is; Is there anyone that have a good idea of how to utilize these drivers? 200liters bass reflex seems .... ordinary.... kinda booring...; I'd very much like to try horn, but I don't have the experience and knowledge...

Any ideas?

Thank you.
  Reply With Quote
Old 10th November 2008, 08:21 PM   #2
diyAudio Member
 
Pikefish's Avatar
 
Join Date: Aug 2008
I can't help but be reminded of EL-PIPE-O: http://www.passdiy.com/pdf/el-pipe-o.pdf

You could call it Eltek Pipe-O.
  Reply With Quote
Old 10th November 2008, 08:32 PM   #3
KI is offline KI  Norway
diyAudio Member
 
Join Date: Apr 2008
Hahaha!! Eltek-PIPE-O could be a lot of fun... I really liked the idea of "small footprint" as well..., but ...; they may be too difficult to handle... And my roof is not that big. Anyway; quality stuff
  Reply With Quote
Old 10th November 2008, 09:32 PM   #4
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
I suggest to try HornResp.

http://mywebsite.bigpond.com/dmcbean/

Then model a TH, Tapped Horn... lots of fun !
__________________
DIYaudio for President !
  Reply With Quote
Old 10th November 2008, 09:38 PM   #5
diyAudio Member
 
Join Date: Dec 2007
Location: Phoenix, AZ
Hello KI, It's possible to make a variation on el-pipe-o, but with a 180 deg. bend to make it half as tall. The foot print will be around double, but it will work.

Peace,

Dave
  Reply With Quote
Old 12th November 2008, 01:13 PM   #6
KI is offline KI  Norway
diyAudio Member
 
Join Date: Apr 2008
Hm...
I tried HornResp, but found it rather complicated. I've been using winISD for other "regular" speakers... And it was quite easy to use.

Is there any basic "howto" for the HornResp application available somewhere? I have the 20.10 versjon.
I understand there should be a wizard located somewhere in the program...

(yes, I'm an idiot).
  Reply With Quote
Old 12th November 2008, 01:18 PM   #7
MaVo is offline MaVo  Germany
diyAudio Member
 
Join Date: Jan 2006
How to use hornresp: read the tapped horn thread.
But those drivers look like they will need very big THs, in the 500L+ per box area. Not the best specs for a TH. Too much VAS too small FS and xmax is small as well. Somehow these look like "midbass in closed box" type of driver to me.
  Reply With Quote
Old 12th November 2008, 01:45 PM   #8
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
these 18inch drivers seem ideal for a vented box.
Although 200L (100L/driver) is a bit small at first guess.
Try a range between 200L and 400L and tunings between 20Hz and 30Hz. WINisd pro is great for this.

A tapped horn is going to be big.
A conventional horn is going to be enormous.

edit:
just noticed the box recommendations at the bottom of the spec sheet.
Looks as though the box needs to be even bigger than 400L maybe going towards 600L for the pair. But you will need to adjust tuning to get the best out the Xmax over a sensible range of frequencies.
__________________
regards Andrew T.
  Reply With Quote
Old 12th November 2008, 11:59 PM   #9
diyAudio Member
 
Join Date: Aug 2008
If you think a horn is too big then try a sonotube. IMHO they are a little difficult and are a great addition to any car or home system.
  Reply With Quote
Old 13th November 2008, 12:55 AM   #10
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
If it were me, a 90 liter sealed box for each driver, stuffed and maybe even sub-chambered. This will give a Qtc of about 0.7 and an f3 of about 70Hz. Now make use of the high efficiency, decent travel, high power handling, and large surface area and electronically EQ it to 20Hz.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  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
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 06:42 PM
2x18" + 8x8" = any ideas? Happy New Year! Jezz-the-Fezz Subwoofers 0 31st December 2007 08:04 AM
Fostex "rated input" and "music power" hugz Full Range 12 16th March 2006 04:33 PM
Some final pics of "Stacks" revisited and "Askew" with stand Andy G Multi-Way 2 3rd February 2005 06:07 AM
Anyone used Scan-Speak's "Flow Resistors" or "Aperiodic Vents"? Ignite Multi-Way 3 18th November 2001 08:42 AM


New To Site? Need Help?

All times are GMT. The time now is 02:55 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