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Old 16th February 2013, 09:06 PM   #21
Helmuth is offline Helmuth  Netherlands
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Here a symulation with a closed backside it works fine probably the best solution and most compact.
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2pi
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1pi
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Old 16th February 2013, 09:17 PM   #22
Helmuth is offline Helmuth  Netherlands
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2pi with 35 liter backside enclosure to reach more flat response in the 2pi radiation down to 56Hz 104dB 1W meter.

I would tune the raising character down so it the sensitivity raises to lower frequencies.

So maximum spl with 5W 110dB 1meter
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Old 16th February 2013, 09:34 PM   #23
Helmuth is offline Helmuth  Netherlands
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Better closed tuning bigger throat area.
Click the image to open in full size.

2pi response. 104dB 1wmtr down to 52 Hz. Build your own low cost la scala with a fine quality 15 driver.
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Last edited by Helmuth; 16th February 2013 at 09:47 PM.
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Old 16th February 2013, 11:23 PM   #24
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I am very grateful for your advice. It s clear that DIYAudio was the place to look for.
I need to read all the posts more carefully, for a next round of questions. Your feed ack is so great!

1) two drivers is a good idea, means I don't need 2405, I really like that driver and wanted to have it. My question is: with only one horn going up to 18k, is it going to beam too much? When I think in horns, I think in fullness so would be disappointing to find that it only sounds good in a narrow hotspot (like my new fe126 I was testing in open baffle).

2) my woofer eminence omega 18a is good with a 400hz XO, gives big bass, moves lots of air giving a unique feeling. But I think it is very nasty with voices when approaching the mid range. Are all woofers that nasty? Or it is just beacause mine is cheap?
Will a beyma or 18sound perform more nicely in the 500hz zone where I am blending with the horn?

I will write autotech to figure out how much would be shipping for those le cleach/iwata horns.

Best!
Charly
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Old 16th February 2013, 11:25 PM   #25
tinitus is offline tinitus  Europe
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take your time
there are many ways

try search.... le cleach
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Old 16th February 2013, 11:46 PM   #26
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by charly chile View Post
2) my woofer eminence omega 18a is good with a 400hz XO, gives big bass, moves lots of air giving a unique feeling. But I think it is very nasty with voices when approaching the mid range. Are all woofers that nasty? Or it is just beacause mine is cheap?
Will a beyma or 18sound perform more nicely in the 500hz zone where I am blending with the horn?
no, 18" is not just 18"

I havent heard it, but quite sure the 18" Faital 18FH500 have better midrange
and there may be others
but ofcourse big woofers with nice midrange are not many
normally a woofer with better midrange would be 15"

well, please remember I suggested a 12" in fronloaded horn down to 100hz
and a simple vented BR sub below that
not without a reason

and btw, normal average SPL could be around 96db
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Old 16th February 2013, 11:55 PM   #27
ScottG is offline ScottG  United States
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I'd recommend expanding your speaker's width a bit more than your 50 CM. Depth can be reduced some. A wider profile not only allows for lager wave-guides, it also provides a reduction in sound pressure loss from the baffle-step region.

This waveguide:

Fiberglass SEOS-24? DIY Sound Group

(..which is a wider dispersion design than others.)

This driver:

ND1460A - HF Neodymium Driver

The midbass really depends on the sort of volume you want for the enclosure vs. the sort of low freq. extension you want. You will want it as efficient as possible.

As Helmuth has mentioned this is a good one:

15MB606 - Very High Output MB Ferrite Driver

..but one of the Beymas may be better for your needs.

-look for drivers with low mms.
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Last edited by ScottG; 16th February 2013 at 11:57 PM.
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Old 17th February 2013, 01:25 AM   #28
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Quote:
Originally Posted by charly chile View Post
1) My question is: with only one horn going up to 18k, is it going to beam too much?

2) my woofer eminence omega 18a is good with a 400hz XO, gives big bass, moves lots of air giving a unique feeling. But I think it is very nasty with voices when approaching the mid range. Are all woofers that nasty? Or it is just beacause mine is cheap?
Will a beyma or 18sound perform more nicely in the 500hz zone where I am blending with the horn?
Charlie,
1) A conical expansion horn can have uniform dispersion to 18K.
Most good horns have polar charts so you can determine dispersion at various frequencies.
The JBL 2405 dispersion patterns are rather unusual, and not very uniform.
2) Using first order crossovers, the six dB peak the Eminence Omega 18a has around 1500 Hz would be clearly audible.
If you are using only a coil for a crossover, the peaky response might actually be worse than it looks on the graph.

There are some 18" that sound OK in the midrange, but most good two way designs use 15" cones, as an 18" beams at a lower frequency than a 15", requiring a crossover too low for a 1.75" diaphragm driver to sound good.
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Old 17th February 2013, 02:09 AM   #29
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I think 40hz is enough for me
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Old 17th February 2013, 06:07 AM   #30
DougL is offline DougL  United States
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I had some thoughts for you:
I ask about 15" woofers. Here are the responses
Looking for recomendations on 15" woofers
Looking for recomendations on 15" woofers

It looks like some of the Pro woofers are designed to play up to where their directivity matches a horn, and others will not.

If I were you, I would prototype your system with the Mini-DSp you have.
You are probably going to need a tweeter, but I would try it as a 2 way first.
I think a Mini-DIG will be your best option, with your DAC running the horn, and lesser DAC's for the Woofers and Tweeters.

As you can see, I am looking at the same things you are.
Good luck.
I will be interested in what you find.
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