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 4th January 2011, 10:54 PM   #21
diyAudio Member
 
Join Date: Feb 2008
150dB is a pretty realistic aim for that much cone area.
  Reply With Quote
Old 4th January 2011, 11:18 PM   #22
diyAudio Member
 
Join Date: Feb 2008


YouTube - 29082010017.mp4
  Reply With Quote
Old 5th January 2011, 01:42 AM   #23
diyAudio Member
 
Join Date: Feb 2010
If you have 16 drivers, at 330cm sq, then your total cone area is 5280 cm sq, assuming the subs have ten mm linear excursion, then you will have a displacement of around 10 liters.

I have twelve inch drivers in my set up with a total displacement of around 17.8 liters, i don't need that much input power because of the cone area, around 1.2Kw total.

I don't get more then around 133db from my set up, my room is not that big, about 1900 cubic feet sealed, I do not think it is possible to get that spl from your subs.

As another poster said, that kind of spl is very bad for your hearing, i have slight ringing in my ears at night some times after watching a movie at high levels, trust me its extremely annoying! so i have reduced to volume at which i expose myself to.

Why not just use winISD to model a ported box, build four of them, each with 4 subs in, and put one in each corner, you will have more then enough SPL.

Finally the "hair tricks" your talking about are normally done with maybe 6 fifteens or four 18"s, from what i have seen, thats 30-40 liter of displacement being funneled out a car window, i don't think you achieve that at home.

Anyway, i look forward to your build, what ever enclosure you choose.
  Reply With Quote
Old 5th January 2011, 10:01 PM   #24
diyAudio Member
 
Join Date: Feb 2008
hair tricks aren't as a result of air movement, they're as a result of sound pressure.

you didn't actually mention how many subs you have, or what enclosure they're in?
  Reply With Quote
Old 5th January 2011, 11:26 PM   #25
diyAudio Member
 
Join Date: Feb 2010
I have 12 subs, in three enclosures, each around 350 liters net, two in corners, tuned to around 20Hz, and one in the center of the room, tuned to 15Hz.

Sound waves vibrate/compress the air, in my opinion, that is "moving" it.
  Reply With Quote
Old 6th January 2011, 06:54 AM   #26
diyAudio Member
 
Join Date: Feb 2008
well there's your problem. Inefficient box design. I do believe your 12 12inch woofers are quieter than the two 12s i used to run in folded horns off less power
  Reply With Quote
Old 6th January 2011, 07:11 AM   #27
diyAudio Member
 
Join Date: Jan 2004
Location: Toronto, ON, Canada
I doubt you'll be able to reach your goal unless you use a huge exponential.
  Reply With Quote
Old 6th January 2011, 11:40 AM   #28
diyAudio Member
 
Join Date: Feb 2010
Well, first of all, i do not/ did not claim to have a problem, i am very happy with my system, i get a near flat frequency response all the way down to 10Hz in my room and can do reference level from around 15Hz upwards with very little distortion.

Efficiency is all relative, are my subs more efficient then a sealed aliment, yes, are they more efficient then a horn, no. I do not have the skill or knowledge to build horn subs or use horn response, so i went with ported, if some one wants to model a horn with a couple of JBL-GT5 12"s of a volume of around 400lt gross that would be interesting to compare to my design.

I doubt that two twelves, would be louder in any enclosure to be honest, but if they were, great!, I'm not overly concerned over max Spl, extremely loud spl is good for showing off, but for day to day its pointless and causes hearing damage, my system is 90% for movies/games and as long as i can do reference levels with out distortion i'm a happy camper!
  Reply With Quote
Old 6th January 2011, 09:16 PM   #29
diyAudio Member
 
Join Date: Feb 2008
my 12's wouldn't have played anywhere near as low, as they weren't designed for it.
  Reply With Quote
Old 14th January 2011, 08:41 AM   #30
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally Posted by ThyDntWntMusic View Post
* Vas: 26.903
* Impedance: 4 ohm
* Qms (Mechanical Factor): 3.312
* Qes (Electrical Factor): 0.478
* Qts (Total Q-Factor): 0.418
* Fs (Resonance): 45Hz
measured specs of a brand new, straight out of the box driver are as follows:

vas: 33 litres
RE: 4.38 ohms
qms: 4.179
qes: 0.622
qts: 0.541
fs: 44Hz

in other words, the published specs are probably off the shelf measurements with no break in period, with obvious variation between woofers :P
  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
WTB: 6.5" woofer to replace broken woofer in cheap band pass subwoofer Jimmy154 Swap Meet 2 5th October 2010 02:00 PM
Tapped Horn Feeding A Unity Horn Patrick Bateman Multi-Way 20 4th September 2010 01:27 PM
Can a Tapped Horn have a negative taper within the horn path? BP1Fanatic Subwoofers 6 13th February 2010 06:04 AM
Lab 12 Tapped Horn, Ron's Austin II, T-Horn, CNC Photo Background layertone Subwoofers 15 23rd January 2010 05:12 AM
Ron's Austin II, old T-Horn, Lab12 Tapped horn, CNC Photo Background layertone Full Range 2 23rd December 2009 12:51 AM


New To Site? Need Help?

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