General Discussion General discussion about all things car audio, from pioneer, orion, alpine and eclipse.

passive radiator

Old 03-13-2010, 12:27 PM
  #1  
50 Watt CAFz'r
Thread Starter
 
Join Date: Jun 2008
Posts: 138
passive radiator

I have a sealed box that used to house two 12's, but only have one 12 now. I'd like to turn it into a ported box, but space for the port is just not there especially with the box's position. I was thinking about a passive radiator, the CSS audio adjustable 12" seems like a perfect option, but I've never used a PR, so I'd like some feedback as to the SQ and output. Thanks.
alphadawg is offline  
Old 03-14-2010, 04:11 PM
  #2  
500 Watt CAFz'r
iTrader: (1)
 
Join Date: Dec 2008
Posts: 968
Sq is as good as any other system if done properly. The biggest problem is tuning as it's a little tricky to add mass to the cone (that's how you adjust tuning freq.). Also, most passive radiators need to be accessed from the rear to add weight, so it can be a pita. However, that new css apr looks really good and has received great reviews so far for it's adjustability. Another issue is the over excursion of the pr, so you have to make sure you use one with enough xmax or sd(cone area) to offset this..the old rule of thumb was 1.5-2x the diameter of the main driver, but i think the css pr's have a lot more xmax so the 12" should be fine with that speaker at it's rms max. Another disadvantage is cost as you have to buy a pr which will be more expensive than a port in most cases.
Denonite is offline  
Old 03-15-2010, 04:48 AM
  #3  
500 Watt CAFz'r
iTrader: (1)
 
liv2ride's Avatar
 
Join Date: Aug 2006
Posts: 668
If you do end up getting a passive radiator, You'll need to cut that internal box volume down since a PR takes up very little internal volume vs another sub, or a port, so you might end up having to rebuild a box or chop down the current one.
liv2ride is offline  
Old 03-15-2010, 09:47 AM
  #4  
500 Watt CAFz'r
iTrader: (1)
 
Join Date: Dec 2008
Posts: 968
Yeah, depending on the volume of your box...that may be necessary as too much volume may cause over excursion of the pr and the primary driver as well. If you have to reduce it, you can always use foam blocks glued to the inside (they are light, easy to calculate volume, and easily removable if needed in the future).
Denonite is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
vrdublu
Car Audio For Sale
4
01-27-2012 09:12 PM
alphadawg
General SQ
8
07-12-2010 02:55 PM
Phjorg
Off-topic Chat
7
04-12-2004 04:31 PM


Thread Tools
Search this Thread
Quick Reply: passive radiator


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.