The Navvy Posted February 16, 2012 Share Posted February 16, 2012 Passive Radiator KG4 KD-12 Can someone please help me understand what this is? I thought it was a 12 inch woofer that I would have use for sometime somewhere. But I'm starting to find out that it is not a driver, and may be a sympathetic resonator of some kind for the KG4 line of speakers. But they had 8" speakers, I think. I have two Heresys (1's E xo), an extra E xo, and a B xo. I'd like to build (or find) a Cornwall (or two). I need something w/a 15" woofer for mono reference or reverb chamber. The Heresys could go to the chamber if I find two Cornwalls, but I'm getting off the subject. What is the function of a KD-12, and should I cut my losses and just resell it or is it something I can use experimentally? BTW, I'm a newbie to this forum, so if I'm in the wrong place, let me know. Tom the Navvy Quote Link to comment Share on other sites More sharing options...
runninshine Posted February 16, 2012 Share Posted February 16, 2012 Welcome to the forum. Someone will chime in soon with more knowledge than me. Quote Link to comment Share on other sites More sharing options...
oldmako Posted February 16, 2012 Share Posted February 16, 2012 I am without a doubt the largest dolt on the forum and I am most definitely under the influence of a certain elderberry and botanical flavored exiler but I think that I am able to answer your querie! Wrongly perhaps, but answer none the less. A passive is a speaker sans magnet, and sans wires. IOW, it has no electrical function whatsoever. Hence, the "passive" moniker. It simply gets into the groove of whatever is playing and encourages air to move freely within the confines of the speaker cabinet in response to the movement of the "powered" drivers. In this way it improves or adds to low frequency response. My understanding is that a speaker with a passive on the back should be placed approx one half of the diameter of the passive to the wall (for starters). Time to refresh my cocktail. Enjoy the KG4s!! Quote Link to comment Share on other sites More sharing options...
oldtimer Posted February 16, 2012 Share Posted February 16, 2012 A passive radiator serves the same function as a port. As said above it is not electronic. Some passives are hard to find and/or unobtainable new, so there is definitely value in them. Quote Link to comment Share on other sites More sharing options...
The Navvy Posted February 17, 2012 Author Share Posted February 17, 2012 Thanks, oldmako and oldtimer, for your replies. Can either of you direct me to a cabinet plan or pic to show how and where the passive is mounted? May be a good experiment to boost some bass out of 10" woofers. I do not have the KG4, just the KD12 passive. Quote Link to comment Share on other sites More sharing options...
frankphess Posted February 17, 2012 Share Posted February 17, 2012 In the discontinued Tangent 500 and t-5000, the passive was mounted below the active woofer. In smaller cabinet designs, it's usually in the back of the cabinet opposite the active woofer. http://www.klipsch.com/tangent-500 http://www.klipsch.com/t-5000 Quote Link to comment Share on other sites More sharing options...
2sick2pray Posted February 17, 2012 Share Posted February 17, 2012 I have a pr and the 12's are located approx. in the middle of the back of the box. hope that helps Quote Link to comment Share on other sites More sharing options...
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