Hi-End and Hi-Efficency loudspeakers (horn + onken)

[audiodesign]

For the CF600 you can contact directly the www.stereo-lab.de

 

[doug20]

so nothing over in the US?

I have been to the website (through your site), its not in English except for the one part saying something about the website/online home pages are not completed.

 

[audiodesign]

You can contact them with the Ebay shop in english

 

[apelizzo]

Andrea, I saw your charts regarding CP380+CF600 Freq. response. Can you also tell me your listening impression like sound stage, sound "density", and response a different listening angle.

 

[audiodesign]

I still need to create the bass reflex box so I cannot give you a feedback about the sound.

 

[apelizzo]

I need some help. I'm ignorant about horns for compression drivers and I saw there are so many around (including wave guides) enough to make me confused. I'd like to understand why some projects on Onken adopt large horns and in others a smaller one, like the one Audiodesign selected. Is it because in some projects is selected a different frequency crossing point in the system?

 

[gedlee]

I need some help. I'm ignorant about horns for compression drivers and I saw there are so many around (including wave guides) enough to make me confused. I'd like to understand why some projects on Onken adopt large horns and in others a smaller one, like the one Audiodesign selected. Is it because in some projects is selected a different frequency crossing point in the system?

There are two basic functions that a Horn/waveguide provide, improved loading and directivty control. A horn is dominately a loading device with little directivity control and a waveguide is dominately a directivity controlling device, but it also has significant loading. In both cases the effectiveness depends on the size of the device to the wavelengths involved. Once either gets to be too small compared to a wavelength it doesn't load or control directivity very well.

 

[apelizzo]

Andrea, can you please confirm your opinion on the parameters of the SM115/N on your website.
-----------------------------
not very good linearity (a dent at 350Hz)

Fs=29Hz (a little high) ???? why a little high

Sensitivity=95-99dB (low) The datasheet states 98dB

Mms=77gr (good)

Min. Imp = 7.4ohm
----------------------

I used Onken calculator and I got:
F3 38.95Hz
97.085dB
and Svent 608 which is closer to Sd more then 512 on Celestion
The box is 256 litres though still not too large IMO.
Also one of the conditions in the Onken calculation is Svent=Sd or Svent no more then 15% smaller of Sd. What would be the consequence if you calculate 512 to be ~40% smaller then Celestion's Sd?

 

[apelizzo]

Thanks Dr Geddes.

Cheers
Alfonso

 

[apelizzo]

Hi There,

I just got 3 original Electro Voice horns Model HP9040 today in immaculate condition all for $120 from a cinema. Are they any good with the CP380M and adaptor in this project with the Celestion 15" FTR15-3070C?

http://www.electrovoice.com/documents/ev/hp9040-eds.pdf

 

[Helmuth]

Hi There,

I just got 3 original Electro Voice horns Model HP9040 today in immaculate condition all for $120 from a cinema. Are they any good with the CP380M and adaptor in this project with the Celestion 15" FTR15-3070C?

http://www.electrovoice.com/documents/ev/hp9040-eds.pdf

That is a nice horn for mid range use the 2"BMS 4591 High qaulity good price. So do not use with the 1 inch beyma.

4591

And combine a super tweeter as the eminence apt80. Nice price very good response and shorthorn important to prevent the horn to colour the sound.
apt80

Regards Helmuth

 

[cypher]

Hi Andrea,
Any news abut progres ?

 

[audiodesign]

In the exceel table used to calculate this project is not clear if the real vent lenght is:

L vent (effective lenght vent) or
L’ vent (corrected effective vent lenght)

What you think about ?

 

[audiodesign]

This is not a big problem because it is possible close same ports during measurement tests.

 

[GM]

L’ vent (corrected effective vent lenght)

The shorter one since the acoustic axial length of an open tube is somewhat longer than its physical length.

GM

 

[audiodesign]

So the longer (L vent) is the real vent leght ?

 

[audiodesign]

The simulation with WinISD give a different result

Using the same voluem and same Fb

the vent leght is 43cm instead of 34.5 or 47cm of exceel

 

[paba]

Hello Andrea,

sorry I am late to this, but why not B&C speakers...from Italy?

HF: DE-400TN-8 (B&C HF drivers DE400TN & DE35 - [English])

LF: (they have several 15 to chose from that can do 40-2000Hz and 97-100 db/w/m), 15HPL76, 15NDL76, 15NW76, 15PL100, 15PLB76, 15PS76...

They even offer a 2-way kit called Box 15 that can be the base for a design like this.

thanks for sharing your design
/Paba

 

[apelizzo]

My speaker is finished after following some of Andreas choices, still working on crossover but so far I'm really impressed.
DDS-ENG wave guide
Beyma CP-380
Celestion FTR15-3070
Crossover is a bit strange but the sound stage is huge and horn is very very pleasent (after many previous disappointments), not beaming at all and don't need to listen on axis. The radiation pattern of the DDS is amazing it gives all together with the bass driver an holographic image near 180 degrees.
I swapped the horn with large Fountek NeoCD2.0 for try and I killed the speaker :{ . NeoCD can only be listened within its own narrow vertical axis. I don't like it make the sound stage fake like many commercial speakers. If you stand up from the couch all detail is gone. The vertical beam of the NeoCD is very narrow.

 

[audiodesign]

Finally the project has been restarted, soon first measurements

Hi-End and Hi-Eff loudspeakers system

Onken box is ready!