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@Scgorg: I have recently built a relatively controlled directivity system (just for relatively lower SPL levels based home use and not PA). :) Details are below. The system uses the following drivers at the moment.. The horn + CD combo keeps changing frequently. (Also, I have a bad, echo...

Yes.. The drivers are nearly in phase below 100Hz causing Omni directional radiation and out of phase above causing cancellation and the cardioidish polar pattern :)

I love the looks of my DIY current speaker system :D Drivers Subwoofer: SB audience NERO SW800 Midwoofer: Faital pro 15PR400 High frequencies: SB audience Rosso 65CDN-T on EXAR 400 horn Pics Backside And the measurements :cool:(controlled directivity to 120 Hz)

At least on this particular horn, there are some side effects.. :) In the above measurements, I used only the drivers at the top and bottom and not the ones on the sides. I had closed the mid taps on the side walls using cellophane tape.. Here are more details about the impact of taps...

Most of the stories around the above builds are available here: https://www.diyaudio.com/community/threads/a-3-way-design-study.376620/post-7746756

That is a B&C DE 360 compression driver + B&C 4NDF3416 (4 nos)

Thankyou :) A modular, configurable directivity system was the goal..

Here is another example DIY horn system.. The "Hells Bells"

Thanks to people like Marcel (and others) who have given away horn/waveguide design software (ATH) for free, one can do good DIY system designs (with good horns/waveguides) easily, at home these days. Here is a simple example of what one can cook up at home on a small PC at home in a few hours...

Along with ATH horns, for those obsessed with constant directivity, some very interesting horn/waveguide designs can be found here: 1) https://audiohorn.net/x-shape-horn/ Other interesting horns are discussed here too: 2)https://sphericalhorns.net/2024/04/27/a-new-coherent-radial-fin-horn/

Javad has recently made a version of the Helios using the WO24Tx driver: https://www.facebook.com/hashtag/heliostxspeaker One needs to be a member of DIYLoudspeakerProjectPad group to view the details though

I have a pair of WO24Ps per side on my speaker. It is a configurable bass-mid module that plays different roles. DSP crossed over around 300Hz in a 3way configuration and crossed over around 1.2kHz in a 2way speaker configuration. In that setup, the top end is handled by a BMS 4550 CD on an...

My idea of a DIY dual 15inch speaker with horn.. :D (ignore the white drivers though)

Thanks for the nice explanation. Unless I am wrong, it seems like a typo has crept in at multiple places w.r.t open baffle speaker radiation pattern. Also dont know if this has been pointed out in this thread earlier. I think all "cardioid" words have to replaced by "dipole".

So the following is the general idea I had in mind with the C-C spacing :) First, the free standing waveguide should be allowed to do its job properly. That needs bit of space. Then, the intended crossover with the horn may occur somewhere in between 600-800Hz. The driver Centre-to-Centre...

I decided to scale up the cardioid mid-concept a little bit more.. ;) Design iteration v2 for a big cardioid box (for Faital Pro15PR400) + EXAR 400 waveguide :D The box is only about 26cm deep from the 'baffle surface' (whatever little there is). A potential accompanying spatially distributed...

So this speaker started out as a relatively low-output PC speaker build. :) A larger woofer than 7-8 inches was never in the picture while the design was thought about simply because I didn't have the space to accommodate bigger speakers. But then things became more exciting, and I decided to...

Actually, a cardioid enclosure can give more output than the same driver in a sealed enclosure down to a certain frequency.. ;) Take a look here and the following post :) https://www.diyaudio.com/community/threads/a-3-way-design-study.376620/post-7343076 In my case, there is some other...

oops, I forgot to say that two of the output channels connected to the woofer driver, on my audio interface have gone bad.. :D It has constant 2% THD across full spectrum. This might definitely have some effect on that 300Hz bump. Need to get a better interface...

@sigbergaudio: My coax is crossed over at 300Hz..Probably this has an effect too. About the mic, I have no idea how good it is for distortion measurements.. By the way the distortion measurement was done using the Sonarworks soundID mic and not minidsp umik-1. My UMIK-1 has other issues, So I...