I think so, but as it turns out, the junctures in the horn do not affect performance.
I concluded that I prefer older JBL horn to newer JBL waveguide, after careful comparison for 2 years. I would say it's all about the personal taste. 🙂
Cut-off frequency for JBL STX825 horn (p/n 5006815)?
Apart from the shape of the slot (sharp/smooth edged or bubble-like) it's the location of the slot (along the z-axis) that determines its impact on the response.
Nearly all JBL horns, from the bi-radial days up to now, are a combination of a slot near the throat and 'bubbles' towards the mouth, in the vertical, horizontal or both walls. The M2 waveguide can be considered as the culmination of decades of R&D.
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I assume the further back the slot is, the better in terms of resonances etc, right ?
Just watch out that it doesn't sound coloured afterwards ! 😉
Fun aside: As Long as your painting isn't too thick it shouldn't matter.
Regards
Charles
Just watch out that it doesn't sound coloured afterwards ! 😉
Fun aside: As Long as your painting isn't too thick it shouldn't matter.
Regards
Charles
In general yes, but the physics of diffraction slots is very complicated.
I have yet to find research that's all encompassing in this respect.
Most research is done using BEM/FEM, because as far as I know, there is no such thing as a unified mathematical theory of diffraction slots.
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There's a white rim visible in the upper section of the throat. Is the driver properly aligned?
Visual psychoacoustics do play a role though! 🙂 (WAF role too!)
I like “coloured” sound hehehe
One of JBL's most elegant horns:
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If you reduce the throat size from 1.5 to 1", increase the vertical coverage angle by about 10-20° and add roundovers, you'll end up with something like this:
An externally hosted image should be here but it was not working when we last tested it.
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Hmm, maybe not.
Stock from factory.
Great, another thing to do..........
Adding 1 - 1.5lbs of acousta stuff helped the mids in the jbl.
Stock from factory.
Great, another thing to do..........
Adding 1 - 1.5lbs of acousta stuff helped the mids in the jbl.
It looks different, but (basically) the same horn was used for the DMS-1.
In combination with modern loudspeaker management, this is still a sota studio monitor.
In combination with modern loudspeaker management, this is still a sota studio monitor.
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This is probably the thread with measurements that was mentioned before by member plasnu.
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Here is a TAD studio monitor that was for sale.
TAD Studio Monitors Speakers For Sale - UK Audio Mart
TAD Studio Monitors Speakers For Sale - UK Audio Mart
Sure! Though according to Boeing it needs a < 400 micro-inches finish for best performance, i.e. essentially hydraulically smooth or in the vernacular, 'smooth as a baby girl's bottom' 😉.
Some of the molded horns I've seen were smooth enough to only need a good wax job with the most aerodynamic DIY paint jobs I've seen were either dipped or had a lot of hours of [meticulous] hand rubbing.
GM
