You guys know what model this box is? It is used for broadcasting at a local school. They claimed to have five of these at the sports gymnasium, another 2 at the entrance and two more spread elsewhere.
That paper sitting on top is an A4 for size comparision.
Particularly I liked it.
So, could someone guess what brand it belongs to?
That paper sitting on top is an A4 for size comparision.
Particularly I liked it.
So, could someone guess what brand it belongs to?
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It reads Phidellis.
As was being discussed in a patent claiming disputs on another thread a few daya ago, if this guy managed to earn money from this its just picking. Now, who copied who? Perhaps JBL came a bit late on turn
Hahaha
Edit: hooops. I found out it us a donorization company near my neighborhood with over 2500m2 of built installations. Wow they must be eating everyone ears in kilometers. I feel really outstranded now.
As was being discussed in a patent claiming disputs on another thread a few daya ago, if this guy managed to earn money from this its just picking. Now, who copied who? Perhaps JBL came a bit late on turn
Hahaha
Edit: hooops. I found out it us a donorization company near my neighborhood with over 2500m2 of built installations. Wow they must be eating everyone ears in kilometers. I feel really outstranded now.
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I mean seriously, the pro audio community stands for progresses in the listening domain and at least here everything goes for free. Then they snap over one of JBLs projects and put an aux XLR pin on it and voila, they have every broadcast event on palm of their hands. Its like you gotta find that guy at a DAW on the event itself to pursue him on letting you maybe just come close to the stage.
Well sorry I wanted to talk a little lol
My pardon.
I would now like to ask an question: does this horn have the capability of working on the quarter wave principle (and what bass it gives)?
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I only called my attention, because first you say that you liked it, (I assumed you were referring to the sound and not the appearance) and then they should be eating ears in kilometers, I just saw it as a contradiction ....
If they sold them in quantities, I bet they have earned good money using low quality controllers there. The appearance seems to confirm this presumption of mine, I see them ugly and cheap. With Selenium / JBL it surely would not have been the same business ....
I have not been to recitals for many years, I can not comment on waves, I do not even know what that principle means.
You do not have to apologize for anything, the best for you, friend
If they sold them in quantities, I bet they have earned good money using low quality controllers there. The appearance seems to confirm this presumption of mine, I see them ugly and cheap. With Selenium / JBL it surely would not have been the same business ....
I have not been to recitals for many years, I can not comment on waves, I do not even know what that principle means.
You do not have to apologize for anything, the best for you, friend
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Thanks. Lol
Yeah the principle states a horn can work as an one close ended pipe that ressonates at the frequency corresponding to 1/4 the wavelenght of the lowest tone, which in turn is assumed to be exactly the horn mouth/ lenght. For example, at 340Hz the wavelenght should be 1m long. A 25cm folded horn is said to work at these frequencies. So, the quarter wave principle states a horn can have almost the same good results for waves 4x that long (i.e. it is 1/4 the lenght if the said wavelenght).
So theoretically the pictured box with its horn having approximately 50cm could work just fine with wavelenghts up to 4x50cm = 2m.
Given the formula f = v/ wavelenght ( v is the speed of sound and f the frequency), f is 170Hz, which is actually good for broadcasting voice.
But I doubt it can do that!
I need someone to tell me how far that JBL horn (which looks like to be the same cabinet except for those extra hi end stuff they've put into it) should be able to deal with.
Bern,
A horn similar in dimensions to the JBL 4560 box (36" x 30" x 24"deep) provides around 6 dB on-axis gain from 160 to 800 Hz.
The response below the horn Fc drops down to the ported response of the speaker used.
As can be seen by JBL's response curve using an E145, the 4560 horn does virtually nothing in the range below 100 Hz, but is an effective mid-bass horn.
The side by side placement of the mid/hi drivers in the "Phidellis" cabinet insures lousy off-axis response due to the path length differences introducing comb-filtering.
Art
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if there really is five of these i'd stack another one upside down on the first to make a big "sorta" D'appolitto with two but you would still need subs.
and some delay on the mid and highs...
and some delay on the mid and highs...
What did you mean?
Now yes ! , I have read the theory many times....🙂
But nobody could ever explain how a good pair of headphones can play such deep bass with such a short wavelength ........
i don't think anybody can explain that one...path length and wavelength are different are you perhaps confusing the two?
and cutoff frequency on a horn is a different kettle of fish.
and cutoff frequency on a horn is a different kettle of fish.
Maybe you can clarify it to me, something is escaping me here....
Here it says that a frequency of 20 hertz corresponds to a length of 56.26 feet, then, how can I hear that frequency in the tiny headset of an earpiece ?
https://www.jdbsound.com/art/frequency wave length chart 2013.pdf
? you don't hear wavelength you hear frequency... if the driver in the headphone earpiece can move back and forth 20 times in a second you have 20Hz...low frequency loudspeaker diaphragms don't move 56 feet...
Dude the boxes are sitting in the school. I can go there friday and make a nice move taking every info. Inclusive, call the company its produced at lol! Although they look kinda old that might just be an impression. Besides, I have a front pic.
Here it goes:
Academia50~
Check on a site called Lenard Audio, hes got a lot of theory. From what I know from there you can hear the earphone because its sellers add something to make it appear to be giving bass. Or thats just shittalking of me lol. Sorry i dunno really.
Here it goes:
Academia50~
Check on a site called Lenard Audio, hes got a lot of theory. From what I know from there you can hear the earphone because its sellers add something to make it appear to be giving bass. Or thats just shittalking of me lol. Sorry i dunno really.
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Bern i may be mistaken but without a better close up it looks like someone used a collar/adapter and mounted a 10 inch driver into a 15 inch opening, or that's a weird compound cone bass driver??
So what do those 56 feet mean? Is the JBL table wrong? Explain it to me please. That my limited intelligence can understand it, please.
That is evident, any transducer can reproduce any frequency, (within the physical and mechanical limits of its construction) the issue is to what sound pressure can do it. (SPL)
But I remember the first headphones that were very heavy, uncomfortable, and had a dreadful sound. In fact, they were simply a minispeaker - like radios small to transistors - inside an elegant shell. I remember the first Pioneer ...
But when the first light designs (open or semi-open, Sennheisser, Koss were among the best known) arose, the sound changed radically.
Not only because they began to use diaphragms of mylar, (the most important advance in my opinion) but also because they were built with ribs studied to compensate the reproduction alignments in the different frequencies. In addition to that, I also imagine that current manufacturers have thoroughly studied the behavior of the human auditory canal, the curves of Fletcher Mundson do not think they apply much here because the sound pressure levels are infimos and FM conclusions are about the behavior of the frequencies in the naturelaza, in open spaces, you know, the 0 DB corresponding to the soft descent of a leaf detached from a tree, and the tremendous sound level of a thunder (of 110 dB). The two extremes discernible by the human ear.
But I think we should open a new thread, I have not found much discussion about it, I found this, but it is not in English, San Google can help us, as always.
Respuesta en frecuencia de Auriculares, ?mentira o verdad? : Equipo home studio | Hispasonic
Sorry OT
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wish i knew your language it would make things easier.
the wave is 56' long but it moves past you 20 times in one second, like being in a boat on the ocean some swells come every 56' apart but the water can still form smaller waves between the larger swells (small waves = higher frequency) air unlike water (or riding on the surface of water) allows the pressure difference to move past you, the pressure differences that are occurring as the various waves move past you are what we hear as frequency, intensity or SPL is the size (amplitude)of the wave peak to peak.
hope that helped!?
the wave is 56' long but it moves past you 20 times in one second, like being in a boat on the ocean some swells come every 56' apart but the water can still form smaller waves between the larger swells (small waves = higher frequency) air unlike water (or riding on the surface of water) allows the pressure difference to move past you, the pressure differences that are occurring as the various waves move past you are what we hear as frequency, intensity or SPL is the size (amplitude)of the wave peak to peak.
hope that helped!?
I miss answering, I'm sorry.
Yes, the language can sometimes be an insurmountable barrier, but your explanation has been very useful, thank you very much.
Okay sorry for taking this long to reply.
Here are te box measurings
Width 70.5cm
Lenght 60.0cm
Height 71.0cm
Upper hifi bar (counting wood diameter) 17.8cm
Horn vertical apperture 45.5cm
Ports 2x 5.5cm by 33.5cm
Ports diameter (thickness) 1.8cm
Te corner protections are 5cm
It took long because an affair did took me out of or right at reality's rigor.
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BERN
Here are te box measurings
Width 70.5cm
Lenght 60.0cm
Height 71.0cm
Upper hifi bar (counting wood diameter) 17.8cm
Horn vertical apperture 45.5cm
Ports 2x 5.5cm by 33.5cm
Ports diameter (thickness) 1.8cm
Te corner protections are 5cm
It took long because an affair did took me out of or right at reality's rigor.
Besta regatas
BERN
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