I guess Ill try to set it up through ups scs... but I have no idea what is meant by "ask for an offer before you ship"
I see myself asking the UPS agent "can you give me an offer" and them saying "what type of offer would you like?"
Then I'd say "Yes....."
😀
I see myself asking the UPS agent "can you give me an offer" and them saying "what type of offer would you like?"
Then I'd say "Yes....."
😀
UPS SCS has a nice online calculator. How often did I write this? Also you can contact nearest UPS SCS station and ask for a personal offer.
They did not contact us.
They did not contact us.
I didnt plan on actually having to choreograph shipping... but, I am acting in real time...as I am working while spear heading this project at the same time...
Worked 5:30am to 10:30yesterday, before that Mothersday, before that Prom...non stop action lately
you can bet I am paying attention this time... and Ty 🙏🙏🙏
also consider that LMH already tried to do the door to door service and they denied us because I am not a business
i'm going to see if they will try to send it again through UPS and I will just tell them I'm a business and see what happens
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Details removed by moderation.
...........................this is apart of that transaction ie the previous attempt .... I think... I thought it was as good as shipped when I received this... kept checking tracking number... no change... then when I received contact from LMH a week later... they relayed to me that they were still waiting on customs papers to be finished.... then there was some question if wood? After that was cleared then I think we made it up to the point of me talking to someone at UPS... they kept calling me a business... I was confused because I am not.... so then he says they dont ship to residential.... end of that story...
Unless theres more details... like details that I am unaware of... this is were we are at....[/TD][/TR][/TABLE]
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Still not shipped...
Maybe some conversation to pass the time...
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Perception of SPL and aspects that can influence such.
An example of such a thing that influences our perception is, masking. The over shadowing of SPL from signal other than the one or ones, under analysis, can manipulate how we perceive levels. These opposing signals do not have to be of the same frequency for masking to take place.
Something that interested me on this topic is a pair of Apple airpod max. The noise cancellation is very effective....I don't know what to think exactly except that it works. It is not a normal experience, or at least not one I am experienced with....I imagine that an anechoic chamber might be similar. In a quiet room in the house, there is still enough ambient noise that when engaging the noise cancellation a major difference is had. Listening to music in this way is very revealing in comparison to my hd600's. Noise floor seems to be a very important topic in consideration of masking
Distortion from diffraction may possibly add to the perception of Spl increase due to the increase of the distortion as spl increases. Unlike thd setting in, Diffraction in a horn, is not accompanied by amplitude distortion from the driver. A theory
I am interested in things that increase what I call dynamic contrast. In sound engineering a dynamic eq set up for expansion comes to mind.
I think....I have covered the things that can cause compression in a system, like mechanical strain of the suspension, Bl drop, and heat causing power compression. I consider lack of direct energy to be a factor....reverb seems to dull/blur transients is part of my thinking. Though we tend to attribute most of the loudness perception to RMS in general, I think that as the harmonic character of the room dances between room modes and more direct energy dominate signal, loudness perception is also skewed regardless of RMS.
It just popped into my head that Reverb is just another source for increasing masking and raising the "active noise floor". I think we look to the decay of the system to judge this, RT60. My experience with the noise cancellations hints at the importance of removing sound that is not apart of the original signal
Just some thoughts
Maybe some conversation to pass the time...
-----------------------------------------------
Perception of SPL and aspects that can influence such.
An example of such a thing that influences our perception is, masking. The over shadowing of SPL from signal other than the one or ones, under analysis, can manipulate how we perceive levels. These opposing signals do not have to be of the same frequency for masking to take place.
Something that interested me on this topic is a pair of Apple airpod max. The noise cancellation is very effective....I don't know what to think exactly except that it works. It is not a normal experience, or at least not one I am experienced with....I imagine that an anechoic chamber might be similar. In a quiet room in the house, there is still enough ambient noise that when engaging the noise cancellation a major difference is had. Listening to music in this way is very revealing in comparison to my hd600's. Noise floor seems to be a very important topic in consideration of masking
Distortion from diffraction may possibly add to the perception of Spl increase due to the increase of the distortion as spl increases. Unlike thd setting in, Diffraction in a horn, is not accompanied by amplitude distortion from the driver. A theory
I am interested in things that increase what I call dynamic contrast. In sound engineering a dynamic eq set up for expansion comes to mind.
I think....I have covered the things that can cause compression in a system, like mechanical strain of the suspension, Bl drop, and heat causing power compression. I consider lack of direct energy to be a factor....reverb seems to dull/blur transients is part of my thinking. Though we tend to attribute most of the loudness perception to RMS in general, I think that as the harmonic character of the room dances between room modes and more direct energy dominate signal, loudness perception is also skewed regardless of RMS.
It just popped into my head that Reverb is just another source for increasing masking and raising the "active noise floor". I think we look to the decay of the system to judge this, RT60. My experience with the noise cancellations hints at the importance of removing sound that is not apart of the original signal
Just some thoughts
Finally the horns have been shipped though I haven't received a tracking number yet...It seems I need broker to receive them...
No idea what a broker is or why I need one lol...or more importantly how to choose one!
Any advice on the topic is greatly appreciated
Thanks in advance!
No idea what a broker is or why I need one lol...or more importantly how to choose one!
Any advice on the topic is greatly appreciated
Thanks in advance!
Always details missing but at least I will soon have the horn in my hands to take my own measurements....
Its possible that these measurements below were taken at 1m. I think the HornResp sim is in the ballpark, which says to me, that there is a good amount of dynamic ability here...Even with higher voltage to get to 115db, a 2nd order LR at 150hz brings max excursion down to 0.4mm
I am trying to keep peak (transients) in mind.... I am not sure how the BL curves of compression drivers behave typically. You would think with such small excursions that BL is linear all the way till xmax/xlim. So if thats the case then having 115db or close to it...still within 0.8mm would be the goal I guess? A 2nd order placed at 30hz limits max excursion to just under 0.8mm, without moving Fr much at all.
In the end I'd still have to make choices that lead to healthy summing of woofer and horn of course.... I am entertaining the extremes and they seem feasible, so when giving attention to more "proper" approaches, like crossing at 300hz for example, the challenges shouldn't be much of any.
The polars are taken with10 degree graduations and the spl chart lines are 10db.
- Isn't this the "horn honk"? 🙂
Beware that such resonant behaviour will need to be dealt with in the crossover filter carefully. It's exactly the kind of thing a typical gated in-room measurement won't show you in a required detail - it gets more or less smeared by the time window and can be easily missed.
It's vastly different. I've only experienced it once when I was a teenager, not sure if I was 15 or 16, but being inside an anechoic chamber is completely different from active noise cancelling. When I went inside the chamber it was not too bad, but when I shut the door I lost part of my spatial awareness almost like a slight sense of vertigo in all directions, and my ears ramped up sensitivity significantly so I could hear the reference sine from each ear quite loudly and after a bit I could hear my pulse and blood in my veins very loud even with a low-ish heartrate.
Shouting caused no reflection at all and my voice was very low unless I had my hands in front of my mouth when speaking, I was unable to hear or communicate with the other person in the room unless we spoke directly towards eachother.
I thought it was a fun experience, but I think it would make an excellent form of torture if you add a blindfold and some handcuffs.
Edit:
I think what I took with me from that experience is that the constant noise everywhere on this planet is absolutely ridiculously loud, I sometimes find myself in secluded parts of some forest trying to find a spot where there are no machine or man made sounds. Don't bring another person, most people will suddenly get a sort of need to start talking when you find a quiet spot. It's just like if you find a good spot for watching the stars far away from artificial lights, enjoy the silence and the natural sounds, it's an increasingly more rare experience.
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Silence to me is the sound of a non-existant pitch black void that the most wondrous figments of the imagination can be carved out of.
What are the settings for these measurements?
The BD looks extremely clean, not to say suspiciously clean.
View attachment 1057021
Not necessarily, these ripples indicate an undersized mouth.
Tractrix horns have their typical 'features', but horn honk isn't one of them.
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I tend to agree with Marcel, but since "horn honk" has no agreed upon definition, argument is pointless.
That's true, so let's focus on what can be inferred from the horn itself.
Camplo's elliptical Tractrix horn is quite long (deep), but with a relatively small mouth without proper termination.
Furthermore, we know nothing about a possible mismatch between the exit (= phase plug) of the Axi2050 and the horn throat.
From horn theory we know that:
However, the mouth termination of Camplo's elliptical Tractrix horn lags behind an axisymmetrical Tractrix horn, especially in the vertical plane.
Compare this:
with this:
Last but not least, 2 historical papers:
Camplo's elliptical Tractrix horn is quite long (deep), but with a relatively small mouth without proper termination.
Furthermore, we know nothing about a possible mismatch between the exit (= phase plug) of the Axi2050 and the horn throat.
From horn theory we know that:
- The required krm for optimum termination increases as the horn is made longer.
- For higher values of krm, the ripple in the throat impedance decreases.
- The mouth area of a horn can hardly be made too large, but it can easily be made too small.
- Midrange and tweeter horns will benefit from krm values ≥ 1.
- A Tractrix horn expands faster than an exponential horn close to the mouth.
However, the mouth termination of Camplo's elliptical Tractrix horn lags behind an axisymmetrical Tractrix horn, especially in the vertical plane.
Compare this:
with this:
Last but not least, 2 historical papers:
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It's definitely resonating, for whatever reason, and this shall be corrected. That's all I wrote, with the caveat about the time window which can hide it easily. It's possible to correct these resonances with a series of simple IIR PEQ blocks (a straightforward matter with a typical DSP, not so easy but possible with a passive filter). Correct measurement method is the key here.