Greetings! In a recent post, "What is this technique called?", mortron asked about ring slot-loaded woofers.
Not sure if this has already been discussed, but apparently KEF has some experience with ring slot-loaded woofers in their triaxial Architectural speaker, the Ci250RRM-THX. The White Paper is certainly an interesting read. Wondering if this design could present a viable foundation for custom HIFI loudspeaker design, i.e. using larger format drivers? Any thoughts?
Product Page
https://us.kef.com/products/ci250rrm-thx
White Paper
https://images.salsify.com/image/upload/s--NpCBx-SO--/w9cbdm861tt4vimzda3g.pdf
Specification Sheet
https://images.salsify.com/image/upload/s--eAiklJpu--/tvle4ezw8itx5p19ba7v.pdf
Discussion
https://www.audiosciencereview.com/forum/index.php?threads/kef-ci250rrm.37929/
https://www.audiosciencereview.com/forum/index.php?threads/kef-ci250rrm-thx.39104/
Not sure if this has already been discussed, but apparently KEF has some experience with ring slot-loaded woofers in their triaxial Architectural speaker, the Ci250RRM-THX. The White Paper is certainly an interesting read. Wondering if this design could present a viable foundation for custom HIFI loudspeaker design, i.e. using larger format drivers? Any thoughts?
Product Page
https://us.kef.com/products/ci250rrm-thx
White Paper
https://images.salsify.com/image/upload/s--NpCBx-SO--/w9cbdm861tt4vimzda3g.pdf
Specification Sheet
https://images.salsify.com/image/upload/s--eAiklJpu--/tvle4ezw8itx5p19ba7v.pdf
Discussion
https://www.audiosciencereview.com/forum/index.php?threads/kef-ci250rrm.37929/
https://www.audiosciencereview.com/forum/index.php?threads/kef-ci250rrm-thx.39104/
Attachments
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Definitely an interesting approach and shows how crucial diffraction control actually is!
It's THX certified, but I suppose it will need a subwoofer, unless you have 5-12 of them in your HT. Actually then mode suppression would be quite efficient too!
@Juhazi
i’ve been saying this for a while now…..within the overall consumer market, Spatial Audio is becoming a thing where the stereo triangle is quite effectively replaced with many speakers and an ambient performance. We have an ATMOS set up in our family room with 4 in ceiling speakers and 4 subs…….DSOTM in spatial imo is far better than stereo could ever be and some of the classical and chamber that’s been remaster for spatial is simply stunning………It actually sounds like I’m on stage with the performers.
What makes this impressive to me is that all of the component speakers are small……there’s just lots of em so with 11 discrete channels and 4 subs, we can easily do 110db dynamic peaks at the listening position…….you’d need quite a 2 way that would dominate the visual to do the same. Now I know how much audiophiles love their visual presentations…….big towers, huge amplifiers and massive turntable plinths and lighted displays……but with spatial IMO, a modest AVR and some small speakers and subs……..folks can give $100k systems a run for their money these days.
i’ve been saying this for a while now…..within the overall consumer market, Spatial Audio is becoming a thing where the stereo triangle is quite effectively replaced with many speakers and an ambient performance. We have an ATMOS set up in our family room with 4 in ceiling speakers and 4 subs…….DSOTM in spatial imo is far better than stereo could ever be and some of the classical and chamber that’s been remaster for spatial is simply stunning………It actually sounds like I’m on stage with the performers.
What makes this impressive to me is that all of the component speakers are small……there’s just lots of em so with 11 discrete channels and 4 subs, we can easily do 110db dynamic peaks at the listening position…….you’d need quite a 2 way that would dominate the visual to do the same. Now I know how much audiophiles love their visual presentations…….big towers, huge amplifiers and massive turntable plinths and lighted displays……but with spatial IMO, a modest AVR and some small speakers and subs……..folks can give $100k systems a run for their money these days.
I don't think you're supposed to put them in a box. These are for cavity wall installation or to be mounted in the ceiling. Effectively you're creating a pseudo IB installation.
Woah……96 amps and channels of DSP available to process as many as 200 channels of input?…..that’s crazy!!!!!
For the analog audiophiles, this is most certainly their armaggedon. 🤣
I thought… what would it be like if one mounted it in a big cabinet, it appears some people have already done it…
Will we see it respawned as a Muon 2, perhaps ?
😊
Wow I wasn't expecting to see that! Complete with casters as well.
It's a shame that KEF don't specify the Qts of the 10" although they do have recommended cabinet sizes.
It's a shame that KEF don't specify the Qts of the 10" although they do have recommended cabinet sizes.
Wondering if perhaps the dimensions of the KEF ring slot follow a particular formula, i.e. similar to how in hornresp the Synergy horn driver ports are adjusted to a certain size, depth, and port velocity? Or is it possible that because it does not load into a horn, the ring slot size can be more loosely defined? For example, in the 10" KEF example, the ring slot width appears to be around 16mm wide at the LF aperture, whereas in the 18" ABX Open Baffle example it is something like 2 inches (Link). Also, the KEF 10" example delivers more midrange frequencies, so perhaps that plays a role in its sizing?
Thanks
Thanks
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Hi Chris,
In the KEF example the woofer crosses to the midrange at 540Hz. Not much success here modeling this BP6 in Hornresp (I assume you mean a Sixth Order Parallel?), and it seems that in some other programs the BP4/6 modeling does not allow for such a high LF cross. Would you have some pointers to help get started modeling a BP6 design like this in Hornresp, taking into account a higher LF crossover?
Thank you!
In the KEF example the woofer crosses to the midrange at 540Hz. Not much success here modeling this BP6 in Hornresp (I assume you mean a Sixth Order Parallel?), and it seems that in some other programs the BP4/6 modeling does not allow for such a high LF cross. Would you have some pointers to help get started modeling a BP6 design like this in Hornresp, taking into account a higher LF crossover?
Thank you!
