Max1636 Posted May 21, 2013 Report Share Posted May 21, 2013 I'm planning a new box which will have 2 Fi SP4 18's in it. I'm very tight on space and was even considering using a sealed box but I'm really not sure I want to do that. I was looking on the PSI Website and happen to come across passive radiators. How well do they work compared to ported systems? (Old Car) 1995 Volkswagon Golf MK3 2.0L: Fi SP4 18 On A DC Audio 3.5K In A PWK Box Hertz DSK 6" Speakers, Clarion HU 3x Fullriver 120aH AGM's, 225A Alt 2012 Subaru BRZ: Audison Prima APK 163 Bit One, Rockford Amps, Audison Sub Link to comment Share on other sites More sharing options...
revoracing247 Posted May 21, 2013 Report Share Posted May 21, 2013 i wouldn't have much weight with my opinion as i've never used them or heard them but from what i've seen they're great when you're tight on space. plus they look cool when they move differently then the woofers. I think you have a bit of truck stuck in your mud bro ~Ford Ranger, ext cabKenwood DDX4701/0ga stinger wiring for big 31/0ga ofc flextech wiring 3 kinetik 800's AQ2200 @1ohm Sundown Audio X15 in a 27Hz tuned ported box LE BUILD LOG!!! Link to comment Share on other sites More sharing options...
Max1636 Posted May 21, 2013 Author Report Share Posted May 21, 2013 i wouldn't have much weight with my opinion as i've never used them or heard them but from what i've seen they're great when you're tight on space. plus they look cool when they move differently then the woofers. Thats what I thought too, also it will make it look like I have 4 18's! (Old Car) 1995 Volkswagon Golf MK3 2.0L: Fi SP4 18 On A DC Audio 3.5K In A PWK Box Hertz DSK 6" Speakers, Clarion HU 3x Fullriver 120aH AGM's, 225A Alt 2012 Subaru BRZ: Audison Prima APK 163 Bit One, Rockford Amps, Audison Sub Link to comment Share on other sites More sharing options...
TaylorFade Posted May 21, 2013 Report Share Posted May 21, 2013 PR's in today's high power, high xmax systems is tough. The rule of thumb with PR's is that you need at least double the displacement of your subs. So... you'd need (4) 18" passive radiators with xmax similar to your subs. OR (2) 18" PR's with twice the xmax of your subs. If you don't have the displacement, the PR's will get beat to death and will unload badly. PR's are awesome. They're just very difficult to implement with larger setups. Link to comment Share on other sites More sharing options...
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