Circular Baffle versus Regular Square Baffle

In this video I test a new baffle design that reduces edge diffraction for the Fostex FE108E Sigma fullrange driver.

[@thomasowens5824]

Really interesting video, I subscribed, I look forward to further material given this is 4 years old.

[@Rocker6969]

What a cool design. Thanks for posting this :)

[@deanedgx]

great video

[@alaskanadventures8124]

Thank you and congratulation on all the designs. I am having baffle edge diffraction issues above 2 Khz on a two way speaker using a 6.5" DA woofer and a 3" BMR for mid/high. Do you have any insight on how a circular baffle would for for the BMR? One additional difficulty would be that it is not round (it has 4 ears for the bolts).

[@Mercury1955]

I've used those Fostex drivers before and those sound nice even though mine were flat mounted.

[@JosephCrowesDIYSpeakerBuilding]

Mercury1955 Yes they a very good drivers. Check out the Scanspeak 10F/8424 which is very nice too.

[@morayjames92]

have you considered installing a layer of damping material between the top of the speaker suspension and the plastic bezel of the speaker frame? F11 acoustical felt is a very good at absorbing over a wide range. This may help smooth out the transition between the edge of the cone and the speaker frame and then the circular curved baffle.

[@JosephCrowesDIYSpeakerBuilding]

moray james thanks James, my friend suggested that since he’s always adding felt to everything! I did make a pocket on the back side of the baffle for felt but I never got around to installing it. I sold the baffles that are in the video and I plan on making another pair soon. The driver will be a midrange from SB Acoustics so maybe I’ll look at doing felt.

[@morayjames92]

@@JosephCrowesDIYSpeakerBuilding there are some interesting flair profile and termination curves being discussed in this DIY Audio thread thought they might be if interest to you. www.diyaudio.com/forums/multi-way/334757-cover-spectrum-spl-low-distortion-2-a-294.html#post5911858 I would like to discuss a custom set of circular baffles for some small Tannoy drivers if you have the time would you mind contacting me at moray james cables at yahoo dot com? Thank you.

[@morayjames92]

another interesting thread here: www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4.html

[@quant2011]

Can you do such scientific review of Gallo Acoustics ADiva +TR sub set? They have so many things right: - round bass and mids cabinets (made of alu and steel) - point source disp - no crossover from 100Hz - very wide dispersion (some can say its bad for the mids due to sidewalls reflections) The only thing they dont have is omnidir high freq dispersion. Thanks

[@joicejewerly5579]

Eye ball comes out🎉🎉🎉I want it too🎉🎉🎉as well as the tweeter pod

[@dartsonik]

congratulations for the work done. do you have new developments on the deflector? Is the deflector diameter related to the speaker diameter or is it independent?

[@JosephCrowesDIYSpeakerBuilding]

This continues to be something that I offer however there is very limited interest. I have a few customers who are happy with them but mostly Japan. The side profile shape is more important that the overall diameter. It must smoothly allow the sound wave to move away from the driver without disruption.

[@dartsonik]

@@JosephCrowesDIYSpeakerBuilding could it also bring benefits to a 2/3-way system if applied to the woofer / mid woofer?

[@quant2011]

Can you calculate the same but for a raw driver, without any cabinet?

[@Norvalddahl]

Hi. Thanks for great video! I wonder how such a rounded baffle would compare to no baffle at all.. just a "nude" driver? Thanks. Norvald

[@vikassm]

No baffle would send most of the energy hurtling towards the back wall, is all. And then it comes back as more reflected sound, sounds like crap. From the measurements shown in this video, This circular baffle is a very clever design. I've tried "infinite" baffles, basically a wall mounted speaker with the back open to another room, I don't like the sound much, and obviously you can't change its position 😂 I think a toroid (donut) shape with the driver in the center would work really well too. In my case, it would be a whole lot simpler to make as I don't own a cnc, one could simply inflate an automobile rubber tube of the appropriate size and layer up fiberglass and epoxy. Once cured, the toroid can then be sanded and painted like any other fiberglass part (fill it up with concrete, sand, sawdust or polyfill to add mass)

[@perbuataniman1149]

Sir, can you give me how to calculate dimension circular baffle for different diameter speaker ?

[@fabricegrard1001]

And the tweeter is cut ?

[@Vindexi]

Why even circular not just an extenting tube?

[@llee4225]

It would be nice to compare with a 45 degree bevelled as most people could make that easier.

[@attainableaudio7130]

iI your impulse response it's the longer decay also due to reflection of the baffle and not the "speed" of the actual driver? Looks nice by the way!

[@JosephCrowesDIYSpeakerBuilding]

Attainable Audio the test results would suggest that. All things being equal I don’t know what else would shorten the impulse response. It wasn’t something I was expecting but there it is.

[@qq32964]

can you hear the difference?

[@JosephCrowesDIYSpeakerBuilding]

Definitely.

[@linandy1]

Wow

[@TrumbleAudio]

The back around the speaker needs more room.

[@TrumbleAudio]

Thanks for testing though! Grew up in Walla Walla where Cain lived before he passed away

[@fonkenful]

Are you referring to the front baffle of the Axiom enclosure? I’d definitely agree with you on that: I’ve used this particular Fostex driver in several backloaded horn designs, and it definitely has very little breathing room between the magnet structure and the sidewalls of mounting cutout if it’s not significantly chamfered on the rear (inside of enclosure). Also, as fabulous as the mids are on this little gem, its top end is definitely weak compared to the more economical models in the FE or FF - WK series. Had the chance to meet and spend some time with Terry at two of Doc Bottlehead’s VSAC events in the early 2000’s - a delightful chap, enthusiastic audio geek, and damned fine craftsman.

[@crossoverchef]

spherical good -circular bad. Your not really comparing circular to rectangular, your comparing sherical.......the circular would actually be worse than the rectangular.