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In Reply to: RE: Polling people who've heard TAD 4000 series drivers posted by angeloitacare on June 16, 2007 at 03:17:34
Hello Angelo,
I heard both the TAD TD4001 and the Radian 950. They sound different.
The TD4001 is far more linear (both at measurement and listening) and the sound is very dependent on the horn (perceived equilibrium can be a bit rising or peaky with some horns).
For my own I prefer a round horn like Marco's horn (Musique Concrete), as the one pictured by Ken Kessler in page 11 in the July issue of "Hi-Fi News" to the TH4001 horn.
Also using an amplifier operating in current (or an amplifier with a large output impedance) is benefitial to the sound of the TD4001 which one can sound a bit dry and metallic with some amplifers, specially with transistors amplifiers.
The Radian 950 possess a slowly decreasing equilibrium. The harshness in the high frequencies often heard on 2 inches drivers is absent with this driver and replaced by an acceptable colouration (difficult to describe but less metallic). Also this decreasing perceived frequency response is favored by audiophile who listen mainly to voice. Finally due to this slowly decreasing response (which ones is quite similar to the often recommended frequency response curve in small auditoriums), the Radian seems easier to match with the low frequency loudpeaker .
Best regards from Paris,
Jean-Michel Le Cléac'h
Follow Ups:
I ask myself how the comparison would be between a TAD and a Radian 850, which, according to the company`s website doesn`t have the "audiophile" decline, but most audiophiles will never buy a ceramic magnet driver for that price.
thanks, Jean Michel
your answers are always very enlightening. What tweeter would you recommend to use with the Radian 950pb ? I heard read good things abought ribbons, like raal, but efficiency does not match. Also, i am not shure if ribbons cobine better than compression tweeters. The Fostex are still my favorite.
rds Angelo
Hello,
Ribbons are excellent but in a different application. Most of them operate as dipoles and are difficult to match with other ways using compression drivers + horns due to a very different kind of room interaction.
Classical tweeters used by audiophiles like Fostex 925, JBL 2405, Beyma CP21 will give classical results ( = mean results). Tweeters like Goto, Ale, Onken, TAD are far better sounding but expensive.
One of the best solution IMHO is to use a small radial horn with a high acoustic Fc (over 1200Hz) to load a TAD TD2001 driver (over the electrical cut-off you need, whatever the frequency). This is the solution often used by Yuichi Arai (with square horns)
http://members.aol.com/araiyuichi
http://members.aol.com/araiyuichi/Craft/Photo/A2000.jpg
or by Marco Henry with round horns
http://www.musique-concrete.com/tarifs/brutivoire.jpg
(Marco proposes for such applications a small horn having an acoustic
of 1450Hz and a larger one havin an acoustical cut-off of 870Hz)
Best regards,
Jean-Michel Le Cléac'h
Jean Michel
it seems the TAD's are your favorite's. I've spoken to Michael, witch is selling his Goto drivers at ebay :
http://search.ebay.com/search/search.dll?ht=1&from=R4&satitle=goto&sacat=293%26catref%3DC6
he told me a alternative to all the highest goto drivers would be :
" if i was you i will go for goto bl5880 lower thats the king
and use a tad 2001 from 1khz and op
that will be very close ( he referes to goto BL188 and BL3880 )to a mutch lower price "
what i am wondering, if it can match the drivers with smaller diaphragm diameter in the highest frequencies in performance. Theoretically, a dedicated tweeter should be better, no ?
have you gone forward with your project to make a mid-bass horn ?
any recomendations ? It's interesting that Goto uses a driver with a relative small diaphragm diameter, to cover the 200hz to 1khz frequency range, with 5,8cm diameter. Would be a 4" not better ?
rds Angelo
Angelo,
The problem with most compression tweeters is that their horn is too small and they use often a lot of diffraction. Also most of them should be considered as supertweeters and crossed over 12kHz. If you really want to have a better coverage of the high mids,while going up to 22kHz IMHO its is better to use a compression driver like the TD2001 mounted on a small axial horn.
I have several low-mid horn project, one for my apartment in paris), the other one for my father's home in Brittany. For the first one, I bought a pair of Western Electric horns reference WE22A. I'll use them most probably with a pair of LMT drivers (similar to WE555 but with an alnico magnet in place of the field coil...).
For the second project I plan to build a horn using my method. Recently I developped the method to calculate horns having a linear evolution of the ratio width/height along the axis. But also may be I'll build a large round horn like Martin Seddon's 160Hz horn (look at http://www.azurahorn.com/azurahorn_horns.html )
or Marco Henry's new 220Hz horn, you can see at:
http://www.musique-concrete.com/exemples/Vincent_J222.jpg
Best regards from Paris,
Jean-Michel Le Cléac'h
Jean Michel
at my gallery :
http://www.flickr.com/photos/audiovoice_hornloudspeakers/page2/
someone uses also a we15a horn+555w. French audiophiles seem to like this solution. However, it demands a lot of space.
rds Angelo
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