kenratboy Posted August 3, 2002 Share Posted August 3, 2002 I was kruz'in on Crutchfield's web site and was looking at some of the Polk gear (I know, shame on me...) Anyway, they had a detailed picture of the tweeter, it looks funky, how does it work, and why is it the way it is? Picture below. ------------------ Receiver: Sony STR-DE675 CD player: Sony CDP-CX300 Turntable: Technics SL-J3 with Audio-Technica TR485U Speakers: JBL HLS-610 Subwoofer: JBL 4648A-8 Sub amp: Parts Express 180 watt Center/surrounds: Teac 3-way bookshelfs Yes, it sucks, but better to come. KLIPSCH soon! My computer is better than my stereo! Quote Link to comment Share on other sites More sharing options...
TBrennan Posted August 3, 2002 Share Posted August 3, 2002 Ken---That tweeter is a Vifa, you can buy them at Parts Express. It's what JBL calls a ring radiator. The diaphragm is a ring suspended at it's middle and it's edge. The voice-coil is probably under the pleat between the 2 rolls. The little phase-plug in the middle prevents interference from the same frequency radiating from opposite sides of the ring. Pretty simple and a very old idea, dates back at least to the JBL 075 "bullet" horn tweeter introduced in the 50s. The JBL slots, buttcheeks and catseyes are ring-radiators too. Quote Link to comment Share on other sites More sharing options...
kenratboy Posted August 5, 2002 Author Share Posted August 5, 2002 WOW!!! Thats some nice stuff for Polk!!! $60 to get the equivalent! But I thought there was a circular diagraph in a speaker, like a horn driver? What soes the driver itself look like? ------------------ Receiver: Sony STR-DE675 CD player: Sony CDP-CX300 Turntable: Technics SL-J3 with Audio-Technica TR485U Speakers: JBL HLS-610 Subwoofer: JBL 4648A-8 Sub amp: Parts Express 180 watt Center/surrounds: Teac 3-way bookshelfs Yes, it sucks, but better to come. KLIPSCH soon! My computer is better than my stereo! For JBL related subjects and more fun, click: http://www.audioheritage.com Quote Link to comment Share on other sites More sharing options...
TBrennan Posted August 5, 2002 Share Posted August 5, 2002 Ken---In this case the diaphragm is ring shaped. Look at the attatchment. The area I've lightened is the diaphragm and moves. The nipple in the middle is the phase-plug, it remains stationary. The voicecoil is under the pleat in the center of the ring, I've highlighted it. Quote Link to comment Share on other sites More sharing options...
kenratboy Posted August 5, 2002 Author Share Posted August 5, 2002 OK, thanks! I didn't know a diagrapg could have a hole in it. ------------------ Receiver: Sony STR-DE675 CD player: Sony CDP-CX300 Turntable: Technics SL-J3 with Audio-Technica TR485U Speakers: JBL HLS-610 Subwoofer: JBL 4648A-8 Sub amp: Parts Express 180 watt Center/surrounds: Teac 3-way bookshelfs Yes, it sucks, but better to come. KLIPSCH soon! My computer is better than my stereo! For JBL related subjects and more fun, click: http://www.audioheritage.org Quote Link to comment Share on other sites More sharing options...
TheEAR Posted August 7, 2002 Share Posted August 7, 2002 This Vifa tweeter is also used by a few high quality speakers.Krell also uses these Vifa tweeters. http://www.krellonline.com/images/p_LAT1b_lg_ALL.jpg Small pic but the LAT1 and the other Krell LAT series speakers also use this HF driver. Polk Audio latest series all sound quite good,I am quite impressed for all the performance the LSi series bring. Oh and here is the clear view of the whole tweeter http://www.polkaudio.com/images/global/lsi/tweeter_diagram_new.jpg The other three most popular,and best tweeters are Dynaudio Esotar,Scan Speak Revelator and Focal Audiom. The Esotar is often used if price no object reference speakers(Rockport,CAT,Cello,Egglestonworks,WEGG and many others). TheEAR(s) Now theears Quote Link to comment Share on other sites More sharing options...
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