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BMS 4592ND performance on a 250Hz tractrix

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toastyghost View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:14pm
Here's a measurement somebody did of an Eminence N314T on the XT1464:
http://www.avsforum.com/forum/155-diy-speakers-subs/2008882-eminence-n314t-xt1464.html

They do off axis too.

I think you'll find quite a lot of horns beam in the upper ranges. For example, VDOSC only claimed to maintain published 90 degree wide dispersion figures 630-12.5kHz

Edited by toastyghost - 06 March 2017 at 10:14pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:26pm
Yeah 10k being the point of no return. I'm just learning about speaker design so this is all a big learning curve for me, so big thanks for you input.

What would be the implications of crossing the xt at 10k say using a bms 4591 (2" version xt) To a hf 60/40 horn? TIA
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:44pm
I think you're overestimating what is needed up that high, cross reference to many boxes if you can find any measure responses on or off axis that you think have nice HF. Perhaps go through Production Partner or download some CLF/GLL files. Or load some boxes into manufacturer simulation software such as MAPP.

Then also factor in air absorption and you might be surprised how little top end there really is on the average show.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:48pm


Here's a few to save you time. Note that the last few are array cabinets and have presets with boosted HF response in the associate preset to account for mid/lf summation of multiple boxes / get more HF out to the far field.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:50pm
Ok that makes sense but having ascertained that anything over 10k has a 20/20 angle makes it pretty useless over 10k so 10k-20k required.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 10:55pm
Yeah that is helpful advice , Ty.

Now need to find either a round or eliptical cd horn for 10k-20k. Square cd flare over an eliptical xt would look awful. Another hurdle.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 11:02pm
You might also have a lot of fun trying to get them to sum nicely without resorting to not so nice sounding super steep filters.

There's a lot of trade offs - the XT1464 might not look so great on paper but in practice it's probably the best off the shelf horn I've heard. And is right up there in the pro market when using the right driver too.

Here's a real world on axis REW measurement of BMS 4594Nd on one with a dual 12" LF section:


Edited by toastyghost - 06 March 2017 at 11:04pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 11:13pm
The intended application of all my research is for pretty large systems hence upscaling to 2". 8 hog stack for instance at the moment, The response is very good it's the dispersion over a large size system that I think it's going to get into trouble. If I can use it for the frequencies that have the 6040 pattern only with a separate horn For more cd and still get the xt sound quality even if it's only in the mf it would be a good trade off
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2017 at 11:16pm
Yeah the response is awesome, 12" not applicable for my purpose either as flh mid kicks go upto 370 just to complicates matters
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Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2017 at 12:06pm
Very detailed information about the XT 1464 can be found here :
http://lambda-labs.com/de/#/tx-3a (tools4music test download)
and here :
hr-systems.biz/downloads/PAF-212-Dokumentation.pdf

both were done by the same person btw. the second one probably is the best documentation of any DIY top there is. Even if its not that fun to use google translator, i would suggest to read the whole article!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2017 at 1:46pm
Originally posted by corell corell wrote:


hr-systems.biz/downloads/PAF-212-Dokumentation.pdf


Any idea if cnc flat packs are available for this one? The online shop carries  a driver set, and protective plastic covers  but no flatpacks Ouch
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corell View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2017 at 2:20pm
look at h audio :)
oh i realise thats probably the online shop you meant, sorry. They had a CNC flat pack once, but no i cant find it anymore... i will ask fabian directly!


Edited by corell - 07 March 2017 at 2:23pm
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