speedbad a écrit:Je ne parle que de ce que j'ai testé et mesuré, quand ça vient de conclusion d'autrui je le signal. Tu as sûrement du oublier mon topic sur mes comparaisons de tweeters, j'ai les deux, dans la même enceinte, je dois donc être un des rare à avoir pu comparer 6600 et 6640 avec la même mise en oeuvre, cf mon topic. Mais s'il a les moyen de faire 6640+ATC SM75 tant mieux.
D'après Troels, dans certains cas, il n'aime pas le beryllium et dans d'autre cas oui. Tout dépend d'après lui, du HP en dessous en charge du registre du médium, et de la façon dont les 2 fusionnent.
Tu as testé un cas précis dans une configuration précise, cela ne permet pas de conclure parmi les inombrables combinaisons possibles.
Ceci dit, tout les hP que tu cites sont excellents et si le résultat n'est pas a la hauteur des espérances, seule la mise en oeuvre sera à blamer
Tweeter:
Quite a range of tweeters were tested for this speaker: Accuton C30-6-0242, Ciare MT320, ScanSpeak D3004/660000, ScanSpeak D3004/6620 (ring-radiator), ScanSpeak D2904/710003 and finally ScanSpeak beryllium D3004/664000 to find the best partner for the 18H52 mid-driver.
This was a rewarding experience as almost all tweeters did well - their way. The Ciare if we wanted a speaker being able to play excessively loud, partly due to its large dome (voice coil). The Accuton for added perspective and detail. The 6620 ring-radiator will play anything without distress, very good indeed. 6600 and 7100 did equally well but the 7100 just made a seamless blend of sounds coming from the two drivers, a more credible presentation of the harmonic structure of instruments and vocals and stayed in for a long time. ScanSpeak beryllium D3004/664000 was tried last because it didn't perform well in some other combinations I've tried, but here it suddenly showed its strength in revealing detail and a harmonic structure at the same time once mated with the 18H52.
I must emphasize that mating drivers based on specs just does not work. I have numerous suggestions on which drivers to combine and we can have the worlds "best" tweeter on paper - and it may sound bad together with the wrong middriver. The crossover topology plays a vital part here and if we use fairly shallow-slope crossovers we simply cannot predict what the blend of sound in the crossover range will be like. It must be tried and frequency response, waterfall plots, distortion data, etc., do not tell a thing about how two drivers will present the harmonic structure of the flute, the oboe, the clarinet, the acoustic piano, etc. If you have trouble with two drivers you absolutely want to mate, try 4th-6th order filters. What may further complicate things is that one tweeter may reveal more detail where another may produce a better harmonic structure. At the end of the day a matter of priority if both cannot be achieved.
L'ATC a une excellent réputation, par contre il impose de filtre plus haut entre le woofer et lui. Le choix du woofer devra donc en tenir compte.