Sub project for PA - Help needed - Page 4 - 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 6th February 2013, 09:00 PM   #31
diyAudio Member
 
Join Date: Oct 2009
Two words in favor of the Bertha with JBL 2242 : F3 30Hz ;-) And another few : no need to get 3000w to get there ;-) Also, please let's respect the topic of this thread : JBL 2242 and modifed half Bertha. There's plenty of space on that forum to discuss other topics. TIA ;-)
  Reply With Quote
Old 6th February 2013, 09:12 PM   #32
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by Lee in Montreal View Post
Two words in favor of the Bertha with JBL 2242 : F3 30Hz ;-) And another few : no need to get 3000w to get there ;-) Also, please let's respect the topic of this thread : JBL 2242 and modifed half Bertha. There's plenty of space on that forum to discuss other topics. TIA ;-)
Lee,

OK, respecting the topic of the thread, why would you favor a cabinet design and driver after seeing it sims so poorly compared to other designs?
  Reply With Quote
Old 6th February 2013, 10:00 PM   #33
diyAudio Member
 
Join Date: Oct 2009
Please. Read post #31. I'd hate to see that thread turned into my religion is better than yours. We all know how it ends.
  Reply With Quote
Old 6th February 2013, 10:11 PM   #34
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by Lee in Montreal View Post
Please. Read post #31. I'd hate to see that thread turned into my religion is better than yours. We all know how it ends.
I have no sub "religion", I simply prefer subs that are the best fit for the intended use.
Care to answer my question posted in #31?
  Reply With Quote
Old 6th February 2013, 10:15 PM   #35
diyAudio Member
 
Join Date: Oct 2009
Thanks everyone for having contributed. That will be my last post on this forum. I have a very short fuse when it comes to people thrashing threads and having difficulties reading simple text. @ Art. You definitely are something. ;-(
  Reply With Quote
Old 7th February 2013, 01:50 AM   #36
diyAudio Member
 
Join Date: Jan 2008
See ya, short fuse Lee ;^).
  Reply With Quote
Old 7th February 2013, 06:06 AM   #37
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by weltersys View Post
As a race car builder, you must know that the only replacement for displacement is an increase in RPM
It's not the only replacement - in the mid-1980's, 1.5 litre displacement turbo-charged Formula One engines were developing up to 1,400 bhp in qualifying mode :-).

A bit like horn loading a loudspeaker...

Kind regards,

David
__________________
www.hornresp.net
  Reply With Quote
Old 7th February 2013, 05:32 PM   #38
diyAudio Member
 
Join Date: Jan 2008
Originally Posted by weltersys
As a race car builder, you must know that the only replacement for displacement is an increase in RPM
Quote:
Originally Posted by David McBean View Post
It's not the only replacement - in the mid-1980's, 1.5 litre displacement turbo-charged Formula One engines were developing up to 1,400 bhp in qualifying mode :-).

A bit like horn loading a loudspeaker...
David,

Although an amazing feat, there is still no replacement for displacement.
Top fuel dragsters are getting around 8500 bhp from 8 liters, a slightly better power to displacement ratio- the 1.5 liter would need to do 1594 bhp to equal that.
And the top fuelers rev to around 8250 RPM, probably several thousand below the turbo-charged Formula One engines.
Of course the top fuel engine would not last through a Formula One race...

Art
  Reply With Quote
Old 7th February 2013, 06:14 PM   #39
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi Y'all,

Here is the Hornresp for the combination of Bertha horn with Levan extension. The horn path could possibly benefit from a little more detail work, but I don't think it would make a difference in the output. This is for a single JBL 2242H @ ~ Xmax. It's definitely a manly sub.

Regards,
__________________
Oliver
  Reply With Quote
Old 7th February 2013, 06:22 PM   #40
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by tb46 View Post
This is for a single JBL 2242H @ ~ Xmax. It's definitely a manly sub.
Oliver,

Manly in size, not so manly in output. Can't win 'em all.
BTY, Short Fuse Lee has left the post to the ones willing to do some comparative work.

Art
  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
Bigger than needed pa enclosures. holger honda Multi-Way 9 14th January 2014 07:15 PM
Newby project idea for HND main project help and advice needed please WIGANWEZ Chip Amps 1 17th September 2011 05:59 PM
Newby project idea for HND main project help and advice needed please WIGANWEZ Chip Amps 0 17th September 2011 02:39 PM
Precision PA conversion help needed PRNDL Tubes / Valves 10 6th December 2007 07:14 PM
Hello from PA! (Project suggestions?) DIYStudent Introductions 3 29th August 2006 09:18 AM


New To Site? Need Help?

All times are GMT. The time now is 12:27 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