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Author Topic: BMS 4590  (Read 3562 times)

Helge A Bentsen

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BMS 4590
« on: January 03, 2018, 03:10:00 am »

Suggestions for a horn for a BMS 4590?

I have the option to buy a pair for a good price, but I haven't found a good horn for them yet.

http://www.bmsspeakers.com/index.php?id=4590_overview
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Ivan Beaver

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Re: BMS 4590
« Reply #1 on: January 03, 2018, 07:33:13 am »

Suggestions for a horn for a BMS 4590?

I have the option to buy a pair for a good price, but I haven't found a good horn for them yet.

http://www.bmsspeakers.com/index.php?id=4590_overview
It would help to know what sort of pattern you are looking for, and also how low in freq that pattern needs to extend.

I have also noted over the years that the same horn can have very different patterns with different model drivers.  And then you can take the same drivers that have a very different coverage on one horn, put them on another horn and now they are essentially the same.

The horn/driver interaction can vary quite a bit

Of course the only true way is to actually put the driver on the horn and measure it.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

Keith Broughton

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Re: BMS 4590
« Reply #2 on: January 03, 2018, 07:35:05 am »

It would help to know what sort of pattern you are looking for, and also how low in freq that pattern needs to extend.

I have also noted over the years that the same horn can have very different patterns with different model drivers.  And then you can take the same drivers that have a very different coverage on one horn, put them on another horn and now they are essentially the same.

The horn/driver interaction can vary quite a bit

Of course the only true way is to actually put the driver on the horn and measure it.
There you go again, messing up the issue with facts ;D
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I don't care enough to be apathetic

Helge A Bentsen

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Re: BMS 4590
« Reply #3 on: January 03, 2018, 08:14:44 am »

90x45 and loading down to 400hz. Ish.

Right now I'm having a hard time finding any decent 2" horn.
Something like a RCF950 would be nice.
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Mark Wilkinson

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Re: BMS 4590
« Reply #4 on: January 03, 2018, 08:55:31 am »

90x45 and loading down to 400hz. Ish.

Right now I'm having a hard time finding any decent 2" horn.
Something like a RCF950 would be nice.

I'm very interested in finding such a horn too.

Ivan, I'm beginning to see some of the variations you mentioned above....same driver on various horns, and vice versa.
Been playing with a couple different BMS 1.4"s on some horns i happen to have.

Too cold to do any off axis testing, but even on axis inside, I'm measuring differences.
Helge, yes, a 2" of the HF950 would be great..
« Last Edit: January 03, 2018, 08:58:40 am by Mark Wilkinson »
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Jack Arnott

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Re: BMS 4590
« Reply #5 on: January 03, 2018, 11:19:36 am »

Suggestions for a horn for a BMS 4590?

I have the option to buy a pair for a good price, but I haven't found a good horn for them yet.

http://www.bmsspeakers.com/index.php?id=4590_overview

On Facebook, Jon Norris has posted some pictures of interesting looking horns that he sells.
They are tractix though, with no specified pattern, but should be good to 400hz.
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Ivan Beaver

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Re: BMS 4590
« Reply #6 on: January 03, 2018, 01:04:48 pm »

90x45 and loading down to 400hz. Ish.

Right now I'm having a hard time finding any decent 2" horn.
Something like a RCF950 would be nice.
In order to have pattern control down to around 400hz in the 45* plane, the horn would have to be around 55" /21 cm tall..

In the horizontal plane, it would be half that size.

So, control wise to 400Hz, the horn has to be pretty large
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

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Helge A Bentsen

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Re: BMS 4590
« Reply #7 on: January 03, 2018, 03:21:15 pm »

In order to have pattern control down to around 400hz in the 45* plane, the horn would have to be around 55" /21 cm tall..

In the horizontal plane, it would be half that size.

So, control wise to 400Hz, the horn has to be pretty large

I can live with that. I just can't find any ready-made ones that looks great on paper, so it might be easier to go for something else.
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David Morison

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Re: BMS 4590
« Reply #8 on: January 03, 2018, 03:28:35 pm »

Quote
Quote from: Ivan Beaver on Today at 06:04:48 pm
In order to have pattern control down to around 400hz in the 45* plane, the horn would have to be around 55" /21 cm tall..

In the horizontal plane, it would be half that size.

So, control wise to 400Hz, the horn has to be pretty large
I can live with that. I just can't find any ready-made ones that looks great on paper, so it might be easier to go for something else.

Ivan can't metric.
He meant to say 55 inches or 139.7cm, which I suspect may be a little impractical for you.
FWIW,
David.
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Ivan Beaver

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Re: BMS 4590
« Reply #9 on: January 03, 2018, 04:31:03 pm »

I can live with that. I just can't find any ready-made ones that looks great on paper, so it might be easier to go for something else.


Ivan can't metric.
He meant to say 55 inches or 139.7cm, which I suspect may be a little impractical for you.
FWIW,
David.
OOPS :-[ :-[ :-[

 I went the wrong way on my calculator (didn't use an app)
Thanks for catching that and correcting me.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!
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