RobWells said:
What can I say? Someone who claimed to have a BE horn designed for the 515 gave me the dims for the basic horn, but not the rear chamber VB IIRC, though can't remember who it was or even if it was in a PM or posted on a forum to go try and find it.
I also have dims for a smaller throat BE horn, which is slightly larger than 9" square, but was under the impression it was designed for an EV driver.
Regardless, short of measuring the new 515's FR and reverse engineering the ideal horn roll off to sum them flat I'm sticking to recommending using its designer's horn basics since if nothing else it will have the most 'open' sound in theory. Indeed, I thought I would be taking a huge step backwards when I was forced to sell my 210s only to find out that the same dual drivers in large, low tuned EBS alignments in the same corners sounded far more 'open'/'real' overall and the efficiency loss didn't have any real impact on the dynamics beyond any system noise being less loud during quiet passages, so an unexpected win-win situation for me. Not to mention I could 'make do' with no sub system even with pipe organ symphonies.
GM
Yep the horn I've been talking about is designed for the EV15L (I use a pair in my 80Hz horns). A friend who has a pair of the real Edgar 80Hz horns has confirmed the throat size. I recall some posts on AA giving different rear chamber sizes for various drivers, but don't remember seeing a different throat size.
edit: looks like you're talking about an Edgar horn I've not come across yet..
Rob.
edit: looks like you're talking about an Edgar horn I've not come across yet..
Rob.
GM said:
When I was searching yesterday I can across an illustration that I think has helped my understand your explanation. Basically it said that the high end roll off of the horn is determined by the throat area. And you're saying that if I use the same throat area as Altec used (129"^2), then by default, the horns rolloff should complement the direct radiator response.
Or in other words, the only parameter that'll effect the FR where the horn is rolling off and the direct radiator gaining is throat area.
Thanks guys for the info and FR graphs. I've spent the last two days building (and still have one or two more days to go) so when I finish I'll post up a proper reply to your posts. The wife and I have just had a little Girl and I've been neglecting family time.
BTW the horn is 83cm long, throat is 28.8x28.8cm (129 square inches) and the mouth is 3515cm^2. Vb is around 45l (accounting for the 5l displaced by the driver).
BTW the horn is 83cm long, throat is 28.8x28.8cm (129 square inches) and the mouth is 3515cm^2. Vb is around 45l (accounting for the 5l displaced by the driver).
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