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In the Forum: Horn-Loaded Speakers
In the Thread: Electro-Voice T350, T35, + Fostex tweeters.
Post Subject: Re: Tweeters: a new round.Posted by Greg B on: 8/8/2005
It's still first order since you have more than two octaves overlap.
But it's a two pole quasi first order as well. I use this trick
sometimes. The problem with first order is that excursion continues to
rise below the crossover point, which of course means higher
distortion. By taking advantage of the highpassed MF output, you have
minimized this excessive excursion, and I'm not surprised it sounds
better.
Funny how the old EV tweeters are still tough to beat. I'll let you
know if I figure out something better, but I'm still working on this
myself. Haven't heard vitavox. Perhaps the 'fancier' fostex
supertweeters? I have not heard them. Cap and L-pad resistor quality is
critical even in the cheaper models.
The main problem with ribbons is that they need a steep crossover,
which is inherently problematic. The other problem is that they seem to
have more non linear distortion than good conventional types. Multitone
burst tests show this. It is audible as a sort of shimmery silver sound
- especially at high SPL, but for low efficiency systems they work OK.
Details and image are good to excellent, but integration is a bitch.
Best integration I got was with a simple quasi second order series
type, which seemed to lock the drivers together. I was shooting for
something that started shallow but increased cutoff below the crossover
point, sort of like what was just mentioned.
Greg B
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