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Multi-Way Conventional loudspeakers with crossovers

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Old 8th January 2013, 04:28 PM   #31
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Quote:
Originally Posted by speaker dave View Post
Your second example has some typical 1st order issues. It has over 2 Octaves of overlap and 90 degree phase shift between the sections. The response is quite good at the measured (simulated?) axis but any up or down movement will strongly degrade the response over a wide frequency range. Both peaks and response holes will come into effect at any position higher or lower than the measurement position.

Overall response at that point is nice, in fact better than the first example. If you situate your speakers exactly and never move then it may be a much better speaker for you than the first. Otherwise....
Yes, you are right. But IMHO 2 octaves of overlap is the mild blend of the two drivers. Yes the respose is simulated but with measured data.
And yes, finally, if you move in the vertical axis the notch come in. But the ears says nothing.

Bye!
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Old 8th January 2013, 05:09 PM   #32
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Fair enough, but the vertical polar response around 3-6kHz must look something like this red line I've crudely sketched. If you brought the woofer forward a bit and re-did the crossover, maybe you could get much closer to ideal 1st order behavior, or maybe even redesigning with a tilt would be enough... you need what, 2.5-3cm shift or so I think.
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Old 9th January 2013, 10:18 AM   #33
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Hi!

Yes, you are correct. The vertical polar is so, but while the mic says "bad", the ears at 3 meters don't notice.
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Old 5th February 2013, 08:32 AM   #34
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Default "EL CHEAPO", 98 dB speaker ,28- 20.000 hz, 4 way, no horns

hi guys,
I have simulated with big precision a super tower ( 150 litres) 6 db /oct ( excluded wf that is second order at 150 hz L2) ,4 way wf 15 " RCF L15P200AK B6 N15 Thiele 120 litres FB=Fa=28 Hz Q=2, midbass 8" Beyma 8 M100 up to 400 Hz, midhigh 5" B&C up to 2600 hz , high ribbon HI-VI RT2 PRO.
someone is interested to see graphs and drawing? : cool:

cheers
inertial

Last edited by inertial; 5th February 2013 at 08:35 AM.
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Old 7th February 2013, 04:01 PM   #35
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Location: Italy
Hi guys!

As promised here are 4 graph of El Cheapo, superspeaker very economical for all.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Thanks!
Bye!
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Old 11th February 2013, 08:38 AM   #36
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hey, lover sdiy, no one is interested to a little cheap speaker that sound very well IMHO and is easy to build, with first order crossover and tw ribbon ,98 db from 70 to 20000 plus a good 18" sub for channe l is monstuos good system IMHO!! Hz? :

by paolo italy venezia, speaker designer
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Old 24th February 2013, 05:33 PM   #37
tubo is offline tubo  Philippines
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Location: Mundelein, Illinois
Hi Paolo,

how are you? your contribution in this forum is very much appreciated. I am very interested with the el cheapo speaker. will you be a able to share cabinet dimensions.

its too cold here in chicago at this time so it will be a while to start building anything.


thank you
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Old 25th February 2013, 10:19 AM   #38
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Oh yes.
Cabinet is 120 liters, MDF 30mm, reinforced internally.
Lower mid is a closed box by 20 liters, and the tweeter sit on it.
Any comment will be much appreciated.

Obviously this is only a simulation but the data is imported from anechoic chamber RCF and it is very precise. I expect big sound with a little tube amp with 4W.

Cheers.
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Old 15th April 2013, 01:37 PM   #39
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Default NEWS

Hi,
A little speaker factory ( canada) have express interest and make me congratulations for my job showed.
Now majbe we will have business..:-)

thanks DIYAUDIO!!!

P.S.: I have upgradated 6 dB / octave perfect phase response, different commercial speakers like thiel 3.5, sonus faber Minima,Minima Amator,Guarnieri,Extrema and mutch others.
ALWAYS IMHO excellent result with a few buks...;-)

If someone of you is interested for his speakers or anything models, i can make simulations and post it here.
Thanks for reading

Paolo ,Venezia ITALY
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Old 23rd May 2013, 12:06 PM   #40
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Hi!

This is the drawing. A bit brent but efficaceus I hope.
Don't hesitate to ask me delucidations.

bye
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