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 13th March 2013, 08:37 AM   #11
diyAudio Member
 
ClackS02's Avatar
 
Join Date: Mar 2013
Location: Kent, UK
Quote:
Originally Posted by OscarS View Post
If this is true, how are you going to design the folded horn?
I guess knowledge was a poor term to use! Designing and tuning will not be a problem, just being in the car ICE industry ive not come accross folded horns ect, Its all been about quality and SPL rather than how far you can throw the sound!.

I need a set of subs that will throw lots of bass at the audience in a large/outside environment! HELP
__________________
-Steve C
-DubRoach Production
  Reply With Quote
Old 13th March 2013, 05:59 PM   #12
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by ClackS02 View Post
I guess knowledge was a poor term to use! Designing and tuning will not be a problem, just being in the car ICE industry ive not come accross folded horns ect, Its all been about quality and SPL rather than how far you can throw the sound!.

I need a set of subs that will throw lots of bass at the audience in a large/outside environment! HELP
The more SPL generated, the louder it is at distance.
SPL falls off at 6 dB per doubling of distance outdoors.

130 dB (about what one Keystone sub with 1500 watts can do at 35 Hz) at one meter will be 106 dB at 16 meters.

Josh Ricci's Gjallerhorn can do that at 25 Hz, but is over twice the size and uses an even more expensive driver.

Doubling drivers and cabinets driven at the same power level gets you another 6 dB.

If you want SPL of 130 dB at 16 meters, you need about 16 Keystones or 8 Gjallerhorns.
That said, a large array increases forward directivity quite a bit, you would still hear that array at around 94 dB at 2048 meters (1.26 miles) away in front of the stack.

Party on, dudes!

Art
  Reply With Quote
Old 13th March 2013, 06:18 PM   #13
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by ClackS02 View Post
I guess knowledge was a poor term to use! Designing and tuning will not be a problem, just being in the car ICE industry ive not come accross folded horns ect, Its all been about quality and SPL rather than how far you can throw the sound!.

I need a set of subs that will throw lots of bass at the audience in a large/outside environment! HELP
Well I suggest start modeling drivers with HornResponse as a start. With ambiguities like those I've underlined, it's gonna be tough to please such a customer-----frankly you need to be a bit more "scientific" with your terminology around here, as this isn't your run-of-the-mill car audio forum with n00bs that don't know squat. When I read something like "lots of bass", it reminds me of a 16 yr old high-school drop-out who now wants to learn how to design bad-a** sound systems with no knowledge of acoustic principles----I'm not saying this is you, I'm just saying what it reminds me of.

I can only assume you already have downloaded HornResponse have models you need critique on......
  Reply With Quote
Old 13th March 2013, 08:26 PM   #14
Rojoh is offline Rojoh  Norway
diyAudio Member
 
Rojoh's Avatar
 
Join Date: Jul 2007
Location: Rogaland
Why not build something tried and tested. Labsub from Live Sound: LSP Documentation Page - drawings, photos, specs and more - Pro Sound Web maybe? Not 18", but...
__________________
Putting out fire with gasoline.

Last edited by Rojoh; 13th March 2013 at 08:29 PM.
  Reply With Quote
Old 13th March 2013, 08:34 PM   #15
diyAudio Member
 
Join Date: May 2006
Quote:
Originally Posted by Rojoh View Post
Why not build something tried and tested. Labsub from Live Sound: LSP Documentation Page - drawings, photos, specs and more - Pro Sound Web maybe? Not 18", but...
Labhorn chokes below 35 hz so it's likely not tuned nearly low enough for the type of music it's needed for in this case. Also, Labhorn has a huge hole in response right above tuning and the drivers used can't thermally handle much power by today's standards. There are better designs.
  Reply With Quote
Old 13th March 2013, 09:35 PM   #16
JLH is offline JLH  United States
diyAudio Member
 
JLH's Avatar
 
Join Date: Apr 2005
Location: Indianapolis, IN
My question is why did the OP choose an 18" woofer? All things being equal, 18" woofers cannot handle as high compression ratios. There is also the increased rear chamber volume required because of higher Vas. This makes the overall size bigger than using multiple smaller woofers.
__________________
Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!
  Reply With Quote
Old 14th March 2013, 12:24 AM   #17
diyAudio Member
 
Join Date: May 2006
I can only speak for myself but I'M choosing an 18 for my next design because it's far cheaper than a couple of 12's (all else equal). I don't need a high compression ratio, and wouldn't design with one anyway since it leads to high velocity and possible turbulence and distortion in the narrowest section of the horn. I'm choosing a driver that has the Vas and qts required for my design and desired size. Larger drivers will usually have higher xmax than smaller drivers.

Besides, weltersys (member here) has extensive experience with some of the newer, larger drivers, and he has some driver recommendations with very strong cones and a well known horn design to back up his claims. I can't afford to experiment so I have to trust people like him and hope everything works out ok.
  Reply With Quote
Old 14th March 2013, 01:34 AM   #18
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Try Blue Aran - Professional Sound and Lighting
I have had some good deals with them.
__________________
http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.
  Reply With Quote
Old 14th March 2013, 09:21 AM   #19
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
you cannot just drop any driver in to a horn,even if the driver is a good horn driver.
you design the horn "around"a driver.
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
.
  Reply With Quote
Old 14th March 2013, 03:03 PM   #20
diyAudio Member
 
ClackS02's Avatar
 
Join Date: Mar 2013
Location: Kent, UK
Quote:
Originally Posted by OscarS View Post
reminds me of a 16 yr old high-school drop-out who now wants to learn how to design bad-a** sound systems with no knowledge of acoustic principles----I'm not saying this is you, I'm just saying what it reminds me of.
.
HA! Thats not me! i want something with headroom! Id rather have a set of subs at half volume than at full with the same SPL !


Quote:
Originally Posted by just a guy View Post
he has some driver recommendations with very strong cones and a well known horn design to back up his claims.
This is it! I need to speak to someone that has first hand knowledge ! Its all well looking at graphs, but id like to know that what im building is going to impress!
__________________
-Steve C
-DubRoach Production
  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
Need help replacing drivers in Dual 18" Folded Horn Sub james122004 Subwoofers 9 20th September 2012 02:02 PM
18" horn enclosure simpleacoustic Subwoofers 15 21st September 2011 08:31 PM
18" Folded Horn Enclosure the_kelso Subwoofers 12 12th February 2006 07:53 AM
Can I multiply an 18" folded horn cab by 0.8 for a 15"? Optical Subwoofers 7 31st October 2004 04:37 AM
18" Folded Bass Horn Design djdan Multi-Way 11 27th October 2003 09:21 AM


New To Site? Need Help?

All times are GMT. The time now is 07:55 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