One 12" L7 with 2 12" passive raditors

[assassyn 10+ year member]

It is a rainy day today, so I was thinking about taking a 3.7 cu box for 2 12" and puting a square hole in the top for a 12" kicker L7 and put 2 passive Raditors in the other holes. Should get loud and LOW, what are your guys thoghts on this????

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[budahbuddy803 10+ year member]

I have never heard a passive radiator. I am very curious what all they do or how much they help improve an sub stage.

 

[memphis_vette 10+ year member]

passive radiators are subs that are mounted in box but not hooked up right?

 

[assassyn 10+ year member]

It is a drone speaker ( basket ,cone, suround, center cap,) no magnet , voice coil, spider,

 

[assassyn 10+ year member]

A passive radiater works as the PORT in a sealed box

 

[nateberrier 10+ year member]

do it and i there better be pics or it didnt happen

 

[I Like Waffle]

Ive messed around with my own "custom" passive radiators before, i plan on doing a build with some eventually. Heres what i can say though from my test, 1 15" on 500w with 2 passive radiators, is louder than 2 15"s on 1000w.

 

[assassyn 10+ year member]

The box I am useing has 1 12" passive and one 12" sony xplod, and It is way louder and lower than 2 xplods, so It is time to try the kicker,

 

[assassyn 10+ year member]

Wow, I got it done. And It sounds really good, it goes way low and still hits hard up high. did not really get any louder, but has twice the car shaking Bass. even with the volume turned down it shakes everything. I think I mite try to sell my passive radators to the local bass heads.

 

[T3mpest 10+ year member]

how heavy were the passives. Do you have any idea of the tuning or did you just drop and go. Honestly the l7's aren't the greatest choice for PR's since they tend to get tuned very high anyway. If you tune high then the port won't eat up alot of box space and that's the biggest issue with a traditional port. However, if you were suffering from port compression before, you can stop that too. Anyway to anyone wanting to try passive radiators

http://www.diycable.com probably among the best quality PR's you can buy. THe only thing that is better are the ones TC sound used to sell and they were ALOT more than 55 a piece lol. (check parts express for pricing, bricks shall be shat...) Lol, anyway you need 2x the amount of surface area for passives as you do drivers. So if your using a single 15, you want either an 18 passive, or 2 15's. To tune them, use the mass kits and the computer program WINISD Alpha. It can do a PR box and it's really easy use. If anyone needs any help on that, ever, just pm me //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[assassyn 10+ year member]

Mine you can add weight with metal washers, I* have a bolt sticking though then center of the PR's , so I can tune it to where ever I want it. In a ported box the l7's have a very narrow freq, range. but with the PR's they seam to go LOW and still sream on the high bass notes. I should find a Video camara so I can put it on you tube, to show what can be done with passive radiators (no one has any good passive radiator vids on there)

but if anybody knows about PR's feel free to share what you know.

 

[T3mpest 10+ year member]

I'm using them in my next install. They will be hidden though so it will look like a sealed box actually sound like it too, albeit very clean with alot of low end and overall ouput... 2 15 drivers and 4 15 passives in 5.5 cubes tuned to 25hz.

 

[assassyn 10+ year member]

they hit all the freq, of a sealed box, but is loud like a ported box, The song "put on" is loud on every note, than the 28hz note hits and it gets windy in the car. I think a good rule of thumb is twice the cone area of the driver. so with a 12" driver you would want 2x 12" Passive rads.

If I add weight to the PR's it hits the low notes so hard, It really shakes the car (flexing the towncar with 1-L7)

 

[KidThump 10+ year member]

Trade you a 12 mt for your L7's...