Enclosure Design & Construction Help Post and discuss your car audio box construction, design, fiberglass and other fabrication questions here.

Sealed box questions

Old 09-28-2011, 04:08 PM
  #1  
Moderator

Thread Starter
iTrader: (2)
 
wasted911's Avatar
 
Join Date: Nov 2005
Posts: 1,285
Sealed box questions

Some of you may not believe it, but I haven't built a sealed box in about 5 years.

I'm thinking about doing it for once in my car and I have some questions regarding it.

1: coming from a home audio background I've always been taught that you should try not to have any parralel sides for standing waves etc. Any truth to this?

2: QTC is ideal at .707 for the flattest response. correct?

3: Polyfill. Just test with it after the enclosure is done?

4: Flush mount the sub to help with sound waves?


And DUKK, no need to start with the "why sealed?". lol
wasted911 is offline  
Old 09-29-2011, 02:42 PM
  #2  
Administrator
 
Dukk's Avatar
 
Join Date: Feb 2006
Posts: 16,855
HEY! did I say anything??

1) Not really but it doesn't hurt to use baffles or damping on the walls to kill upper range reflections.

2) Qtc = .707 is the best balance of size and response. Lower Qtc can extend bottom end but the box gets bigger. Higher Qtc increases response, decreases bottom end, and shrinks box size.

3) I always try to have some sort of damping in the box.

4) Unnecessary. Much more important with mids/tweets but usually impractical in a car anyway.

For sure though, the best way to make sure that your sealed box is going to sound good is to put a port in it.
Dukk is offline  
Old 09-29-2011, 10:04 PM
  #3  
50 Watt CAFz'r
 
Join Date: Jun 2011
Posts: 117
The subwoofer will be a more determining factor as to weather of not it will sound good in a sealed box. Port a woofer designed for a sealed box and typically you will get a large response peak, and seal a woofer optimized in a ported box and you will have a great mid bass, as a general rules of thumb but by no means gospel is at qtc of .4 and lower generally a ported box will sound better, between .4 and .5 is the grey area lots of woofers fall into and above that a sealed box will usually sound better. All the comments you stated ring true in most circumstances
mommjomma is offline  
Old 10-02-2011, 01:27 PM
  #4  
Moderator

Thread Starter
iTrader: (2)
 
wasted911's Avatar
 
Join Date: Nov 2005
Posts: 1,285
It'll be a 10W3V3, which if im not mistaken likes sealed.
wasted911 is offline  
Old 10-02-2011, 09:31 PM
  #5  
500 Watt CAFz'r
iTrader: (3)
 
Join Date: Mar 2006
Posts: 597
one thing to remember is that for car audio, lower -3db frequency is going to be much higher, about 50Hz, than for a home sub, which you want under 30Hz. The reason is called "room gain", which can be around 50hz in a car too.. That provides a bass boost to counteract the slope of the sub in box.
zoomer is offline  
Old 10-15-2011, 12:59 PM
  #6  
0 Watt CAFz'r
 
Join Date: Oct 2011
Posts: 11
Originally Posted by wasted911 View Post
It'll be a 10W3V3, which if im not mistaken likes sealed.
Not sure if I should post this here, but having issues getting an answer elsewhere.
I just bought a 12" Kicker CVX and having same sealed box issues trying to get the best SQ, power and size for the sub. I would like to go ported, but in search of the perfect box for a flatter response, sealed is just easier, and cheaper

here's the manual:
http://assets.sonicelectronix.com/manuals/kicker/2010CompVX.pdf

I ordered a 1.0 cu ft box and a solo classic, which is designed for 1.0 cu ft, but the sub order fell through, so I'm stuck with this box for now. The manual for the CVX says 1-4.6
Also the rms power fluctuates quite a bit between the 2 sizes. I'm running an MB Quart Onxy with 500w @ 4 ohm. Saying it does 600 rms, what would the perfect sized box be to hit all range of notes and pushing the sub right to its technical limits?
cashoholic is offline  
Old 10-17-2011, 05:14 PM
  #7  
500 Watt CAFz'r
iTrader: (1)
 
Join Date: Dec 2008
Posts: 968
^^open a new thread bro...I'll post some winisd graphs for you...this is another guys thread.

Last edited by Denonite; 10-17-2011 at 05:19 PM.
Denonite is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dkitt10
Enclosure Design & Construction Help
7
05-02-2006 07:32 PM
salty
General SQ
20
11-25-2005 07:13 AM
Tzu
General Discussion
8
01-03-2004 10:00 PM


Thread Tools
Search this Thread
Quick Reply: Sealed box questions


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.