Megaton Horns - Experiences?

Spatz · 26th September 2010, 10:49 PM

Hi,

has anyone worked with the Czech Megaton Horns yet? I'm especially interested in the Waveguides A9090 and C9090 in combination with the Vifa XT25 tweeter...

Opinions on other horns or with other drivers are welcome as well!

Bye,

Spatz

Spatz · 28th September 2010, 11:06 PM

Anyone?

Cal Weldon · 29th September 2010, 12:33 AM

Google shows this thread. Can you give us a little more?

Spatz · 29th September 2010, 12:35 AM

MethMan · 11:20 AM

I don't know of anyone using this kind of combo. A9090 is made for 1" compression driver and you cannot mate it with 1" coil tweeter, because of surround. For better orientation - letters are for throat diameter A(1"), B(1.5"), C(2")
I own A9090, but I didn't use them already, just measured with DE250 years ago. Then I found Geddes work ...
For surrounds I'm using Monacor WG300 with seas 27TBFCG. I can show a polar measurements lately.

If you are requesting something more concrete than "opinions" I can ask at prodance forum for you.

Spatz · 29th September 2010, 11:22 AM

Hi Methman,

for the XT25 I want to use the C9090, the A9090 would interest me for the use with smaller tweeters with 19mm-voicecoil...

Do you think the A9090 would be okay according to Geddes' ideas?

How is the build quality of the horns? In the pictrures at Prodance it looks rather crappy...

Bye,

Spatz

zeonrider · 29th September 2010, 11:49 AM

Quote:

Originally Posted by Cal Weldon

Google shows this thread. Can you give us a little more?

& Pic's!

Regards zeoN_Rider

MethMan · 29th September 2010, 12:18 PM

Quote:

Originally Posted by Spatz

Hi Methman,

Do you think the A9090 would be okay according to Geddes' ideas?
Spatz

NO WAY. It is heavily diffractive device. It has not diffraction slot per-se but it change profile very rapidly at the throat and angle at throat itself is, say, 40deg.

Quote:

Originally Posted by Spatz

How is the build quality of the horns? In the pictrures at Prodance it looks rather crappy...

Bye,

Spatz

It is raw sandstone cast aluminium with machined backplate. Solid, reliable, predictable, low cost - exactly as PA guys needs. No shines, sharp edges and submilimeter tolerances.

MethMan · 29th September 2010, 12:37 PM

A9090+ B&C DE250

Spatz · 30th September 2010, 04:40 PM

Hey Tomas,

thanks for you opinion. Let me rephrase: Do you think the C9090 is more according to Geddes' ideas than the Dayton H12RW. The C9090 at least has a smooth mouth and is not that deep...

The measurement looks pretty good off axis...

Bye,

Spatz

26th September 2010, 10:49 PM	#1
Spatz diyAudio Member Join Date: Jan 2008 Location: Hamburg	Megaton Horns - Experiences? Hi, has anyone worked with the Czech Megaton Horns yet? I'm especially interested in the Waveguides A9090 and C9090 in combination with the Vifa XT25 tweeter... Opinions on other horns or with other drivers are welcome as well! Bye, Spatz

29th September 2010, 12:33 AM	#3
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Google shows this thread. Can you give us a little more? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

29th September 2010, 11:17 AM	#5
MethMan diyAudio Member Join Date: Jun 2004 Location: Praha	I don't know of anyone using this kind of combo. A9090 is made for 1" compression driver and you cannot mate it with 1" coil tweeter, because of surround. For better orientation - letters are for throat diameter A(1"), B(1.5"), C(2") I own A9090, but I didn't use them already, just measured with DE250 years ago. Then I found Geddes work ... For surrounds I'm using Monacor WG300 with seas 27TBFCG. I can show a polar measurements lately. If you are requesting something more concrete than "opinions" I can ask at prodance forum for you. __________________ Tomas Last edited by MethMan; 29th September 2010 at 11:20 AM.

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28th September 2010, 11:06 PM	#2
Spatz diyAudio Member Join Date: Jan 2008 Location: Hamburg	Anyone?

29th September 2010, 12:35 AM	#4
Spatz diyAudio Member Join Date: Jan 2008 Location: Hamburg

29th September 2010, 11:22 AM	#6
Spatz diyAudio Member Join Date: Jan 2008 Location: Hamburg	Hi Methman, for the XT25 I want to use the C9090, the A9090 would interest me for the use with smaller tweeters with 19mm-voicecoil... Do you think the A9090 would be okay according to Geddes' ideas? How is the build quality of the horns? In the pictrures at Prodance it looks rather crappy... Bye, Spatz

30th September 2010, 04:40 PM	#10
Spatz diyAudio Member Join Date: Jan 2008 Location: Hamburg	Hey Tomas, thanks for you opinion. Let me rephrase: Do you think the C9090 is more according to Geddes' ideas than the Dayton H12RW. The C9090 at least has a smooth mouth and is not that deep... The measurement looks pretty good off axis... Bye, Spatz

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