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Multi-Way Conventional loudspeakers with crossovers

How to Make a New Wave Biradial Horn
How to Make a New Wave Biradial Horn
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Old 28th February 2018, 07:35 AM   #251
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by silverprout View Post
A matrix of points in order to generate facets seems more adequate IMHO
That's what I do. Then a friend of mine can generate smooth surface from these points in Grasshopper/Rhino - not my expertise.
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Last edited by mabat; 28th February 2018 at 07:42 AM.
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Old 28th February 2018, 12:42 PM   #252
IG81 is offline IG81  Canada
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Quote:
Originally Posted by hollowboy View Post

I was under the impression that a good design will 'steer' the lobes so that there are no big notches on and around the listening height, but I don't really understand how this is calculated / how the lobes are 'steered' (I guess I should read up + noodle around with some simulating software until the concept clicks a bit better).
The main lobe is "steered" both with physical driver spacing on the Z-axis and in the crossover. Secondary lobes should be minimized so as to have a first reflection response as uniform as possible. This is often done using steep slopes. 4th order LR24 is fairly common for DSP users.

Imagine two 4" speakers in separate 4" cubic enclosures sitting on top of each other. Each speaker's sound arrives to you in phase or at the same time, the main lobe is thus horizontal, let's call that 0. Now move the top speaker back by 4" and you can easily see how the point where the sound arrives in phase (again main lobe) is now shifted up to 45.
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Old 1st March 2018, 06:37 AM   #253
silverprout is offline silverprout  France
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Originally Posted by gedlee View Post
the vertical control fails even lower than the horizontal and as such lacks control through the crossover region where the lobbing occurs making it worse. It has almost no control along the diagonals due to its rectangular nature. Finally, the mouth flare is not sufficient to eliminate reflections
I can imagine that, but i need some data to be convinced.

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Originally Posted by mabat View Post
I have no idea how well it will behave acoustically with a non-circular mouth
You seems to be intelligent but you can't modelize exactly the response with your brain... me neither.

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Originally Posted by hollowboy View Post
have it anointed with majik audiophile lacquer
I don't see any measurement about the diagonals.

--------------------

I've recently sent a mail to a sympathetic Italian manufacturer in order to obtain a 3D polar measurement of a horn, here is the answer :
"We didn’t receive any request of 3D diagrams before now.
In our opinion our horn have quite simple design, its are not so complicated, vertical and horizontal pattern are sufficient to understand the behaviour"


So, if vertical and horizontal pattern are sufficient to understand the behaviour, it seems that the whole world is idiot.
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Last edited by silverprout; 1st March 2018 at 06:40 AM. Reason: you can't
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Old 1st April 2018, 02:28 PM   #254
mabat is offline mabat  Czech Republic
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First example - horizontal polars (0 - 120 deg / step 10 deg), raw SPL data, driver B&C DE250.
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Old 1st April 2018, 02:30 PM   #255
mabat is offline mabat  Czech Republic
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And it can be equalized -
Looks good
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Old 6th April 2018, 01:19 AM   #256
Ro808 is offline Ro808  Netherlands
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Marcel, could you post Pet007's excellent measurement results from his 2 way (Sica + B&C) as well?

Last edited by Ro808; 6th April 2018 at 01:40 AM.
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Old 6th April 2018, 04:58 AM   #257
mabat is offline mabat  Czech Republic
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Hi. In fact these are the same data. I suppose I should start a new thread...
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Old 6th April 2018, 04:27 PM   #258
Ro808 is offline Ro808  Netherlands
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Originally Posted by mabat View Post
Hi. In fact these are the same data. I suppose I should start a new thread...
You're right, it wasn't obvious on the screen of my iPhone.

Last edited by Ro808; 6th April 2018 at 04:37 PM.
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