Musical Subwoofer.... ported or sealed? - Page 11 - 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 30th October 2011, 11:20 AM   #101
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
Revboden,

I have an old computer on with Perfect Box installed, the Peerless woofer was one of the 1st on the list. Even Perfect Box recommended 5cf, 140liters (Iso). I'll just have to re-build the box, probably go with 100Liters.

Thanks for the advise.




Quote:
Originally Posted by revboden View Post
I found the old specs, for the 831857.

That's a very small box for that driver. 1.5ft^3 gives a Qtc of 1.126
  Reply With Quote
Old 30th October 2011, 03:20 PM   #102
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Post #91

Hi revboden,

A Qtc of 1.1 (or so) should lend itself well to applying a Linkwitz transform (which should be used with an additional low cut). That way you get the small box size, and control over the low end response.

Regards,
__________________
Oliver
  Reply With Quote
Old 30th October 2011, 07:25 PM   #103
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
I did try to load/use WinISD, and had a few start up problems. It would be nice to get that up and running, lean how to use it.


The sheet is up on the saw table and marked for cuting for a 101 liter box, but maybe too big?


OR.... I could pick up a few liters (e.g. 110 liters), if I concentrate on no/less waste.


The box will be used for the shop, however it will be used quite a bit (-; (-;
  Reply With Quote
Old 30th October 2011, 08:08 PM   #104
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
Odougbo,
The exact size won't matter (100 vs 110) that much 100L should be fine.

about WinISD, i find that the help file - 'getting started' - 'entering new driver data' is very useful.

Tb46, good point. although you'd need a lot of power and very careful maths, building a bigger box is much cheaper and easier if you have the space.

later,
rev.
  Reply With Quote
Old 30th October 2011, 09:27 PM   #105
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
Okay back to 100liters. Thanks!!

WinISD ~ I was getting numerous error windows. I have a XPS computer w/Vista, a few years old, but works okay. The selection of configurations looks really interesting.

The help file, said it wasn't loaded. I'll keep trying.............Much better with power tools than computers.
  Reply With Quote
Old 5th November 2011, 09:57 AM   #106
diyAudio Member
 
nonsuchpro's Avatar
 
Join Date: Sep 2011
Location: Bowie, MD
Ok, to date I've bought 4 subwoofers and made 5. The most musical subwoofer I have is the driver out of a $100 Sony SA W2500 put in a 12"x12"x12" sealed box coupled with a Dayton SA100 plate amp. Amazing!
__________________
My Studio
  Reply With Quote
Old 5th November 2011, 11:38 AM   #107
diyAudio Member
 
Join Date: Oct 2010
Location: Colorado Springs, CO
Quote:
Originally Posted by nonsuchpro View Post
Ok, to date I've bought 4 subwoofers and made 5. The most musical subwoofer I have is the driver out of a $100 Sony SA W2500 put in a 12"x12"x12" sealed box coupled with a Dayton SA100 plate amp. Amazing!
To date every time I've heard a ported sub that wasnt tuned to the max flat frequency, it sounded bad. Just as you wouldnt design a sealed sub with a high Q like 1.0, I fail to see why this wisdom gets thrown out the window for ported subs with guys tuning them to ring. You cant tune to some arbitrary frequency to induce ringing, say at 33hz, when the max flat tuning frequency should low to mid 20's.

Dont judge ported systems on your too-high-tuned prior builds. Build it to exactly the size and tuning frequency you get in WINisd and then see what you think. The reason all your sealed subs sound good is that none of them are rining in too small a box with the wrong tuning frequency.

Just an opinion since you are asking. Good luck with your project.
  Reply With Quote
Old 5th November 2011, 02:25 PM   #108
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
Cool Odougbo's two cents:

I did experiment with Sealed vs. Ported boxes - using the same amp - same model Rockford P2- same location (Tacoma ex cab) - same music. As you can see in the pic #1, I tried both, following supplied RFFG plans.

The grays ones in particular.

Results: I know a lot the car buffs are not going to agree, but after several attempts, I went with the ported box. The bass is stronger, deeper, amazing really, no one believes it is an 8".

The sealed boxes? They were okay, just couldn't get as low.

btw, the P2 is very "musical" a wide range of bass notes.

**btw, let me know if some ones any of these boxes - Yikes!

*** I am enjoying the new build, (2nd pic) it is sealed.
Attached Images
File Type: jpg P8s.JPG (204.9 KB, 169 views)
File Type: jpg Douginator.JPG (251.1 KB, 162 views)
  Reply With Quote
Old 5th November 2011, 04:20 PM   #109
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by ODougbo View Post
The bass is stronger, deeper, amazing really, no one believes it is an 8".
That's why - you used an 8" driver for your test .

What size was the box? Quite likely you can fit a larger driver in there if you seal it up.

I've been using 2x12" sealed in my car audio builds for the longest while. Goes as low as I want, and as loud as I want.
__________________
www.diysubwoofers.org
  Reply With Quote
Old 5th November 2011, 04:51 PM   #110
ODougbo is offline ODougbo  United States
diyAudio Member
 
Join Date: Aug 2011
Location: Maryland USA
Oh sure, plenty of 10"s 12"s 15"s (on and on) out there that will run circles around these.

[however I thought the P2 8"was better than others 8"s, I didn't buy the JL]

The point is: pound for pound, after several attempts, following RFFG plans to the letter - the BR box did go lower and out perform the sealed box.

It wouldn't matter to me if it was ported or sealed, just passing along info/testing that I did.

The gray boxes fit perfectly behind the seat of a X cab Tacoma, one reason for the 8"s. But I do like them (-:
  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
Ported vs TL vs sealed Jimmy154 Multi-Way 103 23rd August 2012 12:07 AM
Ported & sealed 2-in-1 subwoofer...possible? rocko1290 Subwoofers 11 11th September 2006 02:53 AM
sealed vs. ported sonu Multi-Way 25 9th May 2005 12:50 PM
Sealed or ported? mazeroth Subwoofers 13 23rd November 2004 12:44 PM
¿Sealed or Ported? eXn Car Audio 28 11th October 2004 11:05 PM


New To Site? Need Help?

All times are GMT. The time now is 02:25 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