Learning the basics of speaker cabinet design

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#42
planet10 said:
Because the drivers are heavy. In my push-push SDX10 woofers, one could use 2 fingers in a driver cutout can lift the box (15mm BB), add the drivers and you really would like 2 guys to carry it.

dave
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This is very impressive indeed But involves also 4 identical woofers ... however i have seen that done before also in the very top models from Krell and Magico ... same concept i think
In general i do not like side firing drivers and omni and planar ... i much prefer only front firing speakers Like a cannon shooting music to me only in the sweet spot I do no listen to music walking around in my room
I know that with your solution vibrations will be nulled But there must be another way And i think it is adding weight
If i could find it i would try very heavy steel backing rings bolted on the woofer basket
https://www.acu-tech.com.au/wp-content/uploads/2018/07/Backing-Ring-664x498.jpg
just to add mass
Please look at the video above mentioned at 14:00 I would love to get your valuable opinion
It is a very strong statement I was literally shocked And worried
 
#44
Hi ! thanks a lot indeed I have seen some polar graph in the web
https://www.researchgate.net/public...a-commercial-loudspeaker-Visaton-WB-10-11.png
the dispersion up to 500 Hz is almost spherical 😳
I see many many totl speakers from various brands using the scheme you mention
One of 1st example i remember were the old AR9 ... if i am not wrong the 1st cut is at around 200Hz ? well below the 500Hz
so a good 3 way can have two woofers in parallel ... but not 4 ohm like i read the old AR9 I listened to them at a guy's home Using a valve integrated the bass was not coming out from the speakers It is strange that 4 ohm drivers are so popular Why ?
I would put two 16ohm in parallel instead
 
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#45
Hi sorry but i really have to ask advice on this ... woofers in parallel mounted back to back
This solution would avoid most of the vibrations issues
I wonder which could be the frequency upper limit that can be set ... i am looking at this
https://www.ravepubs.com/wp-content/uploads/2021/11/loudspeaker-1.jpg
the 180° dispersion at 500Hz looks to be at -3dB respect to on axis ? better to stay lower than that ?
A friend of mine bought a pair of these
https://www.quotidianoaudio.it/wp-content/uploads/2015/02/phantom.jpg
i am a little puzzled by them ... i would prefer a passive solution with a separate amp However I like their compactness a lot indeed
I listen nearfield
 
#49
the brand is Vivid Audio from Australia?
what has impressed me is to understand that with this arrangement the cabinet does not need to be massive This is very good indeed
i have looked at some polar dispersion graphs and i saw that at 500Hz the dispersion at 90 degrees is down of just - 3dB
it is not a viable concept for a 2 way only
3 ways are needed and also a cone midrange
problem is that 4 identical woofers are needed
and good woofers are the more expensive parts usually
 
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