Passive woofer...

Jszar · Post by **Jszar** » Thu Oct 07, 2004 11:01 am

will someone explain this to me? what is it, and what advantages/disadvantages does it have?

i cant find any resources on the net to explain this...

Ryan from Ohio · Post by **Ryan from Ohio** » Thu Oct 07, 2004 11:51 am

Basicly it just a cone and surround mounted inside a frame.

I personally wouldnt ever use one. Out of time for today though....

Jszar · Post by **Jszar** » Thu Oct 07, 2004 1:04 pm

so there is no advantage in power usage or spl? right?

William from NOLA · Post by **William from NOLA** » Thu Oct 07, 2004 3:15 pm

They are usefull for adding more feeling in the car. They won't add much SPL to you because they are not doing work. They will assist in moving a little more air and proportioning the airwaves (multidirectional 'firing'), but my guess is it will take away from the active driver's efficiency.

They are basically the sub minus the magnet and voice coil. They do have spiders.

Ryan from Ohio · Post by **Ryan from Ohio** » Fri Oct 08, 2004 2:56 am

I have a little bit of know how about them, but I have never used them.

I would assume William is right though. If one driver is pushing out then the passive is sucking in. Which will lower the efficency.

With the passives they both have to be in the same airspace.

I have heard you can gain about 2 dB (pretty sure thats what I read) if you can properly build/setup a box for them.

Jszar · Post by **Jszar** » Fri Oct 08, 2004 4:53 am

alright. my specualtion was that they had no overall advantage. but someone was insiting that it did....and i have never read anything about them. so i wanted to see if anyone knew anything.

i guess the Infinity BassLink system uses a passive woofer, i didnt know that, till now.