Real life example please as I can’t recall seeing such a design.
Real life example please as I can’t recall seeing such a design.
there is no real life example (maybe the Tom Danley Synergy horn without the horn?) I'm just curious if this is a good way to go to have multiple woofers in a baffle without having it be a floor stander.Real life example please as I can’t recall seeing such a design.
Unless you use a very wide baffle no speaker will have much directivity below 1000Hz. The wavelength at that frequency is longer than the baffle width hence it doesn’t block the driver. Speaker is in a 4Pi space.I also liked the goal to get better directivity below 1 kHz.
Are you are suggesting two D’Appolito layouts where one set rotated 90 degrees?there is no real life example (maybe the Tom Danley Synergy horn without the horn?) I'm just curious if this is a good way to go to have multiple woofers in a baffle without having it be a floor stander.
I understand that the industry shifted away from having wide baffles for a reason that i don't remember right now, but that was in the 80s, we have technology now that they didn't have access to back then.
Are you are suggesting two D’Appolito layouts where one set rotated 90 degrees?
Are you are suggesting two D’Appolito layouts where one set rotated 90 degrees?
I have not simulated such a design but I expect the low frequency units will create phasing errors. If you plan the outer units to be cut off below 1000 Hz then placement of the drivers wouldn’t matter much. All you will achieve a wide and chubby speaker, which is ergonomically not suitable for domestic rooms.
Your example is a PA speaker where the sound level is the main criteria. It was a wishful thinking design to boot. Please don’t see this the wrong way as arrogance but you need to study speaker design before making design suggestions for Hi-Fi speakers. There are a myriad of physical limitations we need to negotiate. We are all happy to help and guide but as this a speaker design thread a basic understanding of the job will be beneficial to all.yes exactly, something like this ceiling speaker i found in the middle of nowhere. Ofcourse there would only be one high frequency driver in the center.
Well there is not really a book or a university course one could follow on speaker design I would love to learn more about this, but i haven't been able to find good sources.Your example is a PA speaker where the sound level is the main criteria. It was a wishful thinking design to boot. Please don’t see this the wrong way as arrogance but you need to study speaker design before making design suggestions for Hi-Fi speakers. There are a myriad of physical limitations we need to negotiate. We are all happy to help and guide but as this a speaker design thread a basic understanding of the job will be beneficial to all.
There are lots of books for various starting levels. Some better than others but for a beginner all should help.Well there is not really a book or a university course one could follow on speaker design I would love to learn more about this, but i haven't been able to find good sources.
any of these in particular you recommend over the others?There are lots of books for various starting levels. Some better than others but for a beginner all should help.
DNA Sequence, if you don't mind a slight clocking of the array. I can't recall seeing a polar map, but it's been years since I read the patent.there is no real life example
I’m afraid I haven’t read any of them. My education was a long time ago at university level first then through scientific and engineering papers.any of these in particular you recommend over the others?
Good for trying to clarify. I thought we were making bass bins that could be used with either the R1 or R2 and that the R2 was even more ambitious in terms of directivity. And that knowing there was augmented bass available, we could use a less expensive driver and direct the savings into a cardioid implementation. Seems a bit of spaghetti thread at the moment.Well what do we want over Directiva R1?
A: An upgrade path for R1 builders.
S: Louder and deeper
M: 3dB or higher sensitivity; F3/F10 lower by 10Hz
A: Doesn't need new NFS (using near field measurements for woofers are entirely appropriate; and accurate up to f(Hz) = 4311/Diameter of emissive cone area (inches)
R: Select bass bin size and appropriate woofer, and then do new W/M crossover, some MT tweaks (remove BSC)
T: 2-3 months (Christmas or Q1 2022)
Option B: New speaker, based on all knowledge gained by designing R1
S- Lower cost, but equal performance
M- Same F3/F10; preference score, cost of drivers at least significant cost reduction (33%)
A- W+M+T <=$300USD; yes; lots of candidates
R: More difficult, will need completely new cabinet and baffle design and NFS measurements
T: 1 year (if it took 8 months to do a Directiva; a 2 way with a DSP crossover, it'll take 6-12 months to do the first 3 way)
The secret sauce is really good measurement technique. Making a crossover is pretty easy nowadays if you have the resolution of measurements the directiva team had from the NFS. I do not believe we will have access.to the NFS this time around.I’m must had missed the good coaxial target.
I know of no good coaxial driver available for DIY market that are as good as the KEF range.
But still; a co-axial is just a co-incident mid and tweeter. Still needs a crossover. And that’s the secret sauce that needs optimisation to all speakers (see Directiva vs SPK5)
So it’ll be interesting to see what comes of this.