[quote="pos"]en les montant soit meme on peut meme encore economiser les 4500$ des 045be qui ne servent à rien (à part à conforter les audiophiles qui sont persuadé d'avoir les oreilles du chien de steve austin), dixit les dires meme de greg timbers: les 476be montent sans problème au dela des 20khz.
Mais si on va dans le DIY autant choisir la solution que greg timbers a choisi pour le sien: 1500AL en dessous de 80hz, 1200Fe de 80 à 700hz, puis 476be jusqu'en haut, sur un pavillon de 9800se monté veritcalement (comme les array)
voici le lien, pour le plaisir des yeux:
http://www.audioheritage.org/vbulletin/ ... php?t=9951
je me souviens d'un commentaire de Timbers à propos des ultra tweeter, confirmant qu'il s'agissait d'avoir une bonne reponse aigu pour les japonais qui ecoutent des formats sacd contrairement à nous qui nous contentons des 15khz:
"
The plain and simple reason for the existance of the 045Be and 045Ti is that the 435Be and 435Al (2430 and 2435 are similar) have a substantial response problem around 10 kHz on many horns and are ceratinly dead by 15 kHz. In the digital age of SACD, our friends in Japan who requested the development of the K2.S9800 insisted on good response at least to 40 kHz. There is no way we could have just used the 435 and had it dump at 15 kHz. We needed to do something at least to clear 20 kHz and we didn't want to make a toy add-on device for a product of this stature. With this said, we did the best we could to develop a dedicated UHF compression driver using a 1" diaphragm. We have two diaphragm materials available for cost reasons. The raw Be diaphragm costs us $100 each! The Ti diaphragm we form in house for about $1.50
The Ti unit is pretty level out to 30 kHz (at 100 dB for 2.83v), then has a bit of a peak and finally dies around 40 kHz. The Be diaphragm is a straight line from 5 kHz, where it is 105 dB (2.83v) to about 60 kHz where it has declined to 95 dB. This is on a horn that holds a 60 H by 30 V pattern all the way out to 40 kHz before it starts to narrow. So there actually is a valid Engineering and Marketing reason for this device to exist.
Does it really matter that we go to 40 kHz or even 60 kHz? Good luck in figuring that out because I'm not going to touch that discussion with a 10 foot pole. I will say that this is our 60th year anniversary and the question may not be unanswered very much longer."